Journal articles: 'Electric power system stability Control'

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Shen, Ji Feng, Han Pin Luo, Jian Bo Cao, Rui Kun Wang, Shi Ju E, and Chen Xu. "Control System Design of New Nanoelectric Boiler." Key Engineering Materials 620 (August 2014): 329–34. http://dx.doi.org/10.4028/www.scientific.net/kem.620.329.

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Traditional electric heating boilers have disadvantages, such as low purity of the heating resistor, low electric conversion efficiency, poor stability, high acquisition, maintenance costs and so on. This paper, on the one hand, analyzed the basic rationale of the current electric heating boilers, and on the other hand, the advantages of nanomaterials. Based on the combination of the basic rationale and the advantages mentioned above, this paper then designed a new type of electric heating boilers, including the relevant control system, which used nanoelectric membranes as the heating component. This new nanoelectric boiler adopts a brand-new heating method, and it does not get heat by the combustion of chemical energy. On the contrary, the electrical energy is directly converted into heat. This new nanoelectric boiler is equipped with the intelligent control system, and uses computers to realize complete automation. It has excellent physical stability, high electric conversion efficiency and power factor as well as a large power density, and low-carbon environment. Compared with the conventional products of the same electric power, this new type of electric heating boilers can save 30% to 50% of energy. Besides, it is environmental-friendly and functional.

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Golov, V. P., D. N. Kormilitsyn, and O. S. Sukhanova. "Analysis of influence of controlled high voltage line and automatic excitation control generators on oscillatory steady-state stability of electric-power system." Vestnik IGEU, no. 1 (February 28, 2022): 38–45. http://dx.doi.org/10.17588/2072-2672.2022.1.038-045.

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According to the rules of installation of electricity-generating equipment, synchronous machines (generators, compensators, electric motors) must be equipped with automatic excitation control devices. Their application has a positive effect on the stability indicators and electrical power-engineering system modes. Currently, the development of industry and an increase in the number of consumers require transmission capacity growth of existing 220 kV power transmission lines. The use of controlled series compensation devices can significantly increase the transmission capacity of a power transmission line, however, there is a problem of stable operation of the electric power-engineering system. To choose the methods for control parameters of automatic excitation control and controlled series compensation device, it is advisable to analyze the oscillatory steady-state stability of the electric power-engineering system that contain a controlled 220 kV power transmission line when regulating the excitation of its generators. Methods of mathematical modeling of the electric power system, the theory of long-distance power lines and electromechanical transients, methods of analyzing the stability of electric power systems are used. The original software in the C++ programming language has been used as a modeling tool. The authors have analyzed the influence of controlled series compensation of high voltage transmission line and generators of automatic excitation control on oscillatory steady-state stability of electric power system. The parameters value of regulation of the controlled series compensation device and the automatic excitation control are determined, considering restrictions while maintaining the positive influence of these devices. Zones of stability of the examined electric power-engineering system are formed depending on setup variable of the devices under consideration. The obtained results can be used to enhance oscillatory steady-state stability of electric power system with controlled series compensation device and automatic excitation control systems.

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Vinitha, JC, and P. Usha Rani. "An overview of load frequency control for grid using various control techniques." IOP Conference Series: Materials Science and Engineering 1258, no. 1 (October 1, 2022): 012056. http://dx.doi.org/10.1088/1757-899x/1258/1/012056.

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Nowadays Electrical power generation using renewable energy systems brings more novel ideas to satisfy the power demand worldwide. Microgrid is one of the ideas that ensures stability and reliability of the power system. Due to seasonal or climatic effect, the power generated by the renewable energy sources has issue in providing a constant power output and hence produces the power imbalance between the source to load. Furthermore, the system frequency cannot be kept constant in all cases. In this case, an electric vehicle (EV) can serve as a power generation source to support the power grid and meet the Load Frequency Control requirement (LFC). Due to their fast-regulating characteristics, electric vehicles provide frequency regulation services. Electric vehicles are used in both primary and secondary frequency management in power systems to quickly suppress frequency oscillations caused by changes in load. The control centre gathers and updates real-time Electric Vehicle data, such as information regarding state of charge and the state of each Electric Vehicle, in order to decide on load frequency regulation dispatch to Electric Vehicles. This paper compares and consolidate the performance of Load frequency control through Conventional plants and Renewable energy systems. The graphical abstract of power system grid is shown in Figure.1

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Zhou, Hongbo, Aiping Pang, Jing Yang, and Zhen He. "Structured H∞ Control of an Electric Power Steering System." Complexity 2020 (July 25, 2020): 1–9. http://dx.doi.org/10.1155/2020/9371327.

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Electric power steering (EPS) systems are prone to oscillations because of a very small phase angle margin, so a stable controller is required to increase the stability margin. In addition, the EPS system has parameter disturbances in the gain of the torque map under different conditions, which requires a certain degree of robustness in the control design. This paper synthesizes the multidimensional performance requirements considering the stability margin, robustness, and bandwidth of the system to form an H∞ optimization matrix with multidimensional performance output in using the structured H∞ control design. The structured H∞ controller not only retains the characteristics of traditional H∞ controllers with excellent robust performance and high stability margin but also has a lower order, which can be better applied in practice. Based on the performance requirements of the system and practical implementation, the structured H∞ controllers with different orders were designed, and the feasibility of the structured controller was confirmed through comparison and theoretical analysis.

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Russo, Antonio, and Alberto Cavallo. "Stability and Control for Buck–Boost Converter for Aeronautic Power Management." Energies 16, no. 2 (January 16, 2023): 988. http://dx.doi.org/10.3390/en16020988.

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The need for greener and cleaner aviation has accelerated the transition towards more electric systems on the More Electric Aircraft. One of the key challenges related to the increasing number of electrical devices onboard is the control of bidirectional power converters. In this work, stability analysis and control of a buck–boost converter for aeronautic applications are presented. Firstly, stability of the buck–boost converter in the Lyapunov sense is proven by resorting to input-to-state stability notions. Then, a novel control design based on second order sliding mode control and uniting control, aimed at overcoming the difficulties generated by the nonlinear input gain function of the system not being sign definite, is presented. Extensive and detailed simulations, designed to emulate one of the possible energy management policies onboard a More Electric Aircraft, confirm the correctness of the theoretical analysis both in buck and in boost mode.

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Cao, Yan Ling, and Zi Bin Yang. "Research Based on Fuzzy Control of Electric Power Steering System." Applied Mechanics and Materials 596 (July 2014): 739–42. http://dx.doi.org/10.4028/www.scientific.net/amm.596.739.

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For electric power steering (EPS) system to the requirement of real-time and stability of the control system, a fuzzy control algorithm applied to the EPS was proposed, and composed a fuzzy controller for appling to the EPS controller. Taking into account both portability and stability of steering, testing the designed fuzzy controller on EPS experiment platform and adjusting fuzzy control parameters online to make the EPS steering feel the best. Experimental results showed that the proposed fuzzy control algorithm had good tracking performance, can meet the requirements of EPS fast and frequent start-stop and the portability and stability of steering.

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Voropai, Nikolai, Dmitry Efimov, Victor Kurbatsky, and Nikita Tomin. "Stability of intelligent energy system and intelligent control methods." E3S Web of Conferences 139 (2019): 01051. http://dx.doi.org/10.1051/e3sconf/201913901051.

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In modern power systems, a variety of both objects and the tools of control is expected to be much larger than before. As a result, the dynamic properties of these systems are complicated, and the issues of maintaining stability come to the fore. The paper provides a brief overview of the types of stability, including those that, until recently, were considered local in the electric power systems of Russia. It is shown that in today’s conditions the violation of these types of stability affects the operation of the electric power system as a whole. Therefore, the coordination of control of both normal and emergency modes of the systems takes on a special role and should become more intelligent. In this regard, a brief overview of machine learning developments of control agents at different levels of the control hierarchy is presented.

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Deltuva, Ramūnas, Robertas Lukočius, and Konstantinas Otas. "Dynamic Stability Analysis of Isolated Power System." Applied Sciences 12, no. 14 (July 18, 2022): 7220. http://dx.doi.org/10.3390/app12147220.

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The islanded mode of operation of an electric power system (EPS) that has generation capabilities provided by conventional thermal power plants, by a pumped-storage power station, or from an interlink with a neighboring electric power system through an HVDC BtB converter is addressed in this paper. The risk for electrical power systems to fall into an islanded mode has recently grown, as it is caused not just by technical reasons but by a geopolitical situation as well. The current strains demand the close consideration of problems related to EPS operation in an islanded mode. This paper considers several. The research covers the following issues. The response of the islanded system to a sudden and spasmodic load change is analyzed in cases when the system deals with the disturbance with internal resources alone and with the help of an HVDC BtB converter’s frequency control functionality. Analysis of the impact of the settings of the HVDC BtB converter on the system’s response to disturbances is presented and the optimal set of parameters found. The impact of the system’s extended inertia on the system’s response is evaluated by using an additional unit of the pumped-storage power station in synchronous condenser mode. Transients in the system when switching a unit operating in synchronous condenser mode on and off are analyzed. The capability of the system to withstand major disturbances, such as disconnection of the pumped-storage power station’s unit operating in a pump mode and disconnection of the HVDC BtB converter in emergency modes, if a situation demands, is researched. The research is carried out by numerical simulations using PSS Sincal Electricity Basic software. Updated operating parameters of the isolated power system and the LCC HVDC BtB converter, as well as frequency control automation provided by ABB, were used in the simulations.

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Liu, Chao Ying, Wen Jiang Wu, Zhan Zhong Wang, and Zhan Feng Gao. "Research on Assistance Control Algorithm for Electric Power Steering System Based on Robust Control Theory." Advanced Materials Research 655-657 (January 2013): 1397–402. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.1397.

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Assistance control is an important control model of electric power steering system. When designing assistance control algorithm, we should not only consider the handiness and stability of steering, but also think of the assistance stability and disturbance resistance from the road surface. In order to improve the overall performance of electric power steering, robust control theory is applied to develop the assistance control algorithm. Based on the above, a robust controller was designed. The influences of the assistance torque deviation and the road surface disturbance on steering were selected as the controlled output. Then the designed controller was tested on electric power steering test bed. The test results show that the robust controller is of better assistant performance than traditional PID controller.

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Rabie, Afaf, Abdelhady Ghanem, Sahar S. Kaddah, and Magdi M. El-Saadawi. "Electric vehicles based electric power grid support: a review." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (March 1, 2023): 589. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp589-605.

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<span lang="EN-US">Grid connected electric vehicles (EVs) can provide energy quality services to ease intermittent renewable energy sources dependent, enhance grid stability performance, reliability and load balancing in the power system. Moreover, incorporating sufficient EVs into the power grid will assist reduce greenhouse gases. However, the unrestrained EVs charging impact the raise of peak request, frequency deflection, voltage instability, power quality from the acceptable limits. It can also cause overloading of the power system equipment and an increase in power losses. In this paper, the influences EV technologies on various energy systems, control scheme strategy, benefits, and motivational challenges are investigated. An overview of the impacts of uncontrolled EV loading on the electric power system and how controlled charging becomes benefit impacts is presented. Moreover, a review of the controlled charge and discharge benefits of EVs and the electrical serving involved in reduction of frequency deviation, voltage stability, power quality improvement is introduced. This review shows that integration of optimal control of EVs with a suitable optimization technique can improve and provide on time multi ancillary services of EV integrated with weak grid. In addition, this review provides research tracks which can be followed by researchers.</span>

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Wang, Jun, and Li Chao Xu. "Electric Hydraulic Power Steering System Simulation Study." Applied Mechanics and Materials 373-375 (August 2013): 154–57. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.154.

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Properly controlling electro hydraulic power steering system can improve steering performance. The relation of motor speed, vehicle speed and steering speed is gained, according to the influence of motor speed on the steering performance. The force and angle input is set in the driver input model. Rotary valve is simulated by four orifices. The steering resistance between tire and ground is simulated by the coulomb friction on two tips of the rack. The method of double closed-loops PID is used to control the motor. The influence of the control strategy on the steering performance is realized by the simulations of three typical situation, which includes steering portability, road feel, the speed of assist force response and its stability. The results of simulation validate the availability of the control strategy, which is the basic of optimization.

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Liu, Dian Ting, and Wen Xin Ding. "The Synchronization Control of a Series Hybrid Power Forklift System." Applied Mechanics and Materials 543-547 (March 2014): 1351–54. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.1351.

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With the improvement of human environment protection consciousness, and at the situation of the high price of crude oil.Hybrid electric vehicle has gradually become the development trend of the future.Synchronization of power supply of the generator and battery is a necessary condition for forklift work stability. The system outputs SPWM signal by single chip microcomputer AT89C51 as the core chip,implementation of the trace function of frequence and phase,implementation of the defensive function of under-voltage and over-current.The circuitry electrical system is simple and flexible control.Hybrid forklift is verified its effectiveness by simulation analysis through multisim and matlab.Implementation of synchronous control of hybrid systems.

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Jiang, Zhizheng, and Benxian Xiao. "Electric Power Steering System Control Strategy Based on Robust H∞ Control for Electric Forklift." Mathematical Problems in Engineering 2018 (September 9, 2018): 1–12. http://dx.doi.org/10.1155/2018/7614304.

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The dynamic model of the Electric Power Steering (EPS) system for electric forklifts and the two-degree-of-freedom (2DOF) forklift models has been established. Based on the control target of electric forklift EPS, a generalized EPS control model with model perturbation and interference is established. The standard H∞control model of the EPS system is transformed, and the EPS generalized state equation of electric forklift is derived. The principle of robust control with genetic optimization is expounded, aiming at the parameters optimization of the weighted function of H∞control model, the constraint function of the genetic algorithm (GA) is constructed, and the robust controller of genetic optimization is derived. Taking the electric forklift TFC20 as the research object, according to the actual data on the forklift, the system model is established in MATLAB, and the effects of PID control, robust control, and genetic robust control are compared, the results show that the power steering characteristic of the robust control is better than the power steering characteristic of the PID control, and the stability of the forklift under the control of robust control is better. Also, the power steering characteristic of the H∞ controller with GA optimization is better than that of an unoptimized one, and its robustness is better, under external pavement interference, the following ability is stronger for the ideal current and the steering is more stable.

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Liu, Jiangcai. "Cogeneration and heat exchanger control system based on clean energy." Thermal Science 25, no. 4 Part B (2021): 2999–3007. http://dx.doi.org/10.2298/tsci2104999l.

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Combined cooling, heating, and power systems have received widespread attention for their high efficiency and clean characteristics. The combined cooling, heating, and power system will join the cogeneration system as clean energy and renewable resource of solar energy, further alleviating the energy crisis and environmental pollution problems. To improve the stability of the distributed power grid connection, the article designs a photovoltaic battery system that can smooth the output power and combines it with the traditional combined cooling, heating, and power system to build a comprehensive cogeneration system. Under the two operating modes of thermal follow, and electric follow, considering the impact of electric vehicle charging load, two environmental cost and life cycle cost indicators are evaluated.

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Soleimani, K., and J. Mazloum. "Designing a GA-Based Robust Controller For Load Frequency Control (LFC)." Engineering, Technology & Applied Science Research 8, no. 2 (April 19, 2018): 2633–39. http://dx.doi.org/10.48084/etasr.1592.

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Power systems include multiple units linked together to produce constantly moving electric power flux. Stability is very important in power systems, so controller systems should be implemented in power plants to ensure power system stability either in normal conditions or after the events of unwanted inputs and disorder. Frequency and active power control are more important regarding stability. Our effort focused on designing and implementing robust PID and PI controllers based on genetic algorithm by changing the reference of generating units for faster damping of frequency oscillations. Implementation results are examined on two-area power system in the ideally state and in the case of parameter deviation. According to the results, the proposed controllers are resistant to deviation of power system parameters and governor uncertainties.

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Lunardi, Angelo, Luís F. Normandia Lourenço, Enkhtsetseg Munkhchuluun, Lasantha Meegahapola, and Alfeu J. Sguarezi Filho. "Grid-Connected Power Converters: An Overview of Control Strategies for Renewable Energy." Energies 15, no. 11 (June 5, 2022): 4151. http://dx.doi.org/10.3390/en15114151.

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The move towards a greener energy mix to fight climate change propels investments in converter-interfaced resources such as wind and photovoltaics, energy storage systems and electric vehicles. The ongoing evolution of the power system is occurring at a very fast pace, challenging transmission and distribution system operators to seek solutions that are not only adequate for this moment but also for future scenarios. Ongoing research in the fields of power electronics, power systems and control aims at developing control strategies that will help the energy transition to occur, while keeping a stable, secure and reliable power system. The objective of this paper is to present a critical review of the control strategies developed for grid-connected power converters found in renewable energy systems, energy storage systems and electric vehicles. The impact of grid-connected converters on the stability of power grids is also reviewed, highlighting the promising control strategies for enhancing system stability.

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Wei, Wan Ying, Jin Ying Chen, and Gang Xie. "Analysis on EPS Machitrical Dual Closed-Loop Control System." Applied Mechanics and Materials 241-244 (December 2012): 1071–75. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.1071.

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The electric power steering system (EPS) is a combination of mechanical and electrical control system. EPS’control strategy used commonly has two kinds: current PID control and fuzzy control .The current PID control based on the difference between target current and feedback current is a curren closed-loop control system and the fuzzy control is a mechanical closed-loop control system based on the difference between forces of the upper part and the lower part of the steering shaft . Taking the margin of the mechanical and electrical closed-loop control system, this paper, a torque feedback loop for the outer ring, a current feedback loop as the inner loop, designed a dual-loop control system, the output of the fuzzy control determined a target current, and then proceed to current PID control, fast-track the target torque. The simulation shows the dual closed-loop fuzzy PID control is superior to two commonly used control strategies so that electric power steering system has a better tracking ability and stability.

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Canciello, G., A. Cavallo, and B. Guida. "Control of Energy Storage Systems for Aeronautic Applications." Journal of Control Science and Engineering 2017 (2017): 1–9. http://dx.doi.org/10.1155/2017/2458590.

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Future aircraft will make more and more use of automated electric power system management onboard. Different solutions are currently being explored, and in particular the use of a supercapacitor as an intelligent energy storage device is addressed in this paper. The main task of the supercapacitor is to protect the electric generator from abrupt power changes resulting from sudden insertion or disconnection of loads or from loads with regenerative power capabilities, like electromagnetic actuators. A controller based on high-gain concepts is designed to drive a DC/DC converter connecting the supercapacitor to the main electric bus. Formal stability proofs are given for the resulting nonlinear system, and strong robustness results from the use of high-gain and variable structure control implementation. Moreover, detailed simulations including switching devices and electrical parasitic elements are provided for different working scenarios, showing the effectiveness of the proposed solution.

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Mushtaq, Basit, and Mairaj-Ud-Din Mufti. "Stability Enhancement of Electric Power Systems by Employing Variable Frequency Transformer." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (March 1, 2022): 012013. http://dx.doi.org/10.1088/1757-899x/1228/1/012013.

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Abstract Economical and technical advantages inherent in the coordinated operation of power systems resulted in large-scale grid interconnection. The major concern regarding the interconnection of the neighbouring power systems with relatively weak tie-lines is the appearance of poorly damped electromechanical oscillations. Inter-area (IA) oscillations reduce system stability and transmission capacity, and without an efficient damping mechanism, these oscillations can cause system failure and even lead to large-scale blackouts. In this work, the impact of variable frequency transformer (VFT) on the IA oscillations of a two-area power system connected in series with the tie-line is investigated. The VFT is a recent power transmission technology that offers continuous control over bi-directional power flow with no harmonic injection. The VFT is made up of a rotary transformer for continuously regulated phase shift, as well as a drive system and control that regulates the power flow through the VFT by adjusting the angle and speed of the rotary transformer. The VFT is controlled to increase system damping, and consequently suppress inter-area oscillations. A comprehensive model of the interconnected power system including VFT is developed in the MATLAB/Simulink environment to study the efficacy of the proposed scheme.

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Fishov, A. G., I. S. Murashkina, A. I. Marchenko, E. Erdenebat, and Y. S. Ivkin. "Тhe study of electronic generation effect on statical aperiodic stability of electrical power system." Power engineering: research, equipment, technology 22, no. 2 (May 15, 2020): 51–64. http://dx.doi.org/10.30724/1998-9903-2020-22-2-51-64.

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One of the key aspects in the development of power engineering all over the world is the use of distributed small-scale generation. This is both based on fuel carbon resources with a synchronized connection between sources when they are connected to the electric power grids and renewable energy sources operated in the electrical grid via frequency converters (electronic generation). The latter brings an inevitable broad use of inverters in available AC power systems. The objectives of this paper are numerous. First is the desire to study the effect of electronic generation on modes and stability of current electrical grids and electrical power systems. Another objective is to establish requirements for electronic generation control that lets us minimize actions on relay protection coordination and automation upon the integration of electronic generation in power grids. A final objective is to increase the reliability of general electrical modes. This article shows the outcomes of the study on the statical aperiodic stability of the electrical power system upon the integration of electronic generation, requirements for its statical characteristics, and the control when operated within the electrical power system.

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Wang, Zhenghao, Yonghui Liu, Zihao Yang, and Wanhao Yang. "Load Frequency Control of Multi-Region Interconnected Power Systems with Wind Power and Electric Vehicles Based on Sliding Mode Control." Energies 14, no. 8 (April 19, 2021): 2288. http://dx.doi.org/10.3390/en14082288.

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In recent years, wind power systems have been used extensively, which not only improve the efficiency of current conventional power generation systems, but also can save traditional fossil fuel resources. However, considering the instability of wind power, after being grid connected, it can easily cause an impact on the stability of the grid operation. Considering the above problems, this paper considers to make full use of the energy storage part of electric vehicles (EVs) to increase the stability of grid operation. Based on the mathematical model, this paper studies the load frequency control (LFC) problem of a multi-region interconnected power system with wind power and EVs. First, since the system states are difficult to be monitored, a state observer is designed to estimate the state. Based on this, the integral sliding mode controller (SMC) is designed to realize the LFC of the interconnected power system. Meanwhile, to obtain better control performance, this paper further analyzes and optimizes the controller parameters based on Lyapunov stability theory. At last, simulations are carried out for the power systems with two regions in Simulink. The results show that the designed controllers are effective to compensate the load demand disturbances. In addition, it is demonstrated that the battery storage of EVs can play the role of peak-shaving and valley-filling in LFC.

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Songzhuo, Shi, and Chen Guangda. "Electric-Power-Steering system Vehicle Control Stability and Return Strategies Based on Predictive Control." Journal of Engineering Science and Technology Review 15, no. 4 (2022): 146–53. http://dx.doi.org/10.25103/jestr.154.21.

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Irwanto, Muhamad, Murina, N. Gomesh, N. Gomesh, M. R. Mamat, Muzamir Isa, and F. Malek. "Frequency Response as Tuning of Power System Stabilizer on Rotor Speed Dynamic Stability." Applied Mechanics and Materials 793 (September 2015): 110–13. http://dx.doi.org/10.4028/www.scientific.net/amm.793.110.

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Power system stability is the ability of an electric power system unit, for giving operating conditions beginning to recover operating state of equilibrium after being subjected to a physical interference. Power system stability has been recognized as an important problem for safe operation of system unit. Stability of power system is similar to the stability of any dynamic system, and has basic mathematical. Concepts from the mathematics and theoretical stability control are first revised to provide background information related to stability of dynamic system generally and establish a connection theoretical. This paper presents to improve of dynamic power system stability using frequency response as tuning of system stabilizer. It is started by electrical power systems mathematic modeling in state variable equation then set the expertise function of frequency response as tuning of system stabilizer. The plant controlled by function of frequency response is tuned to left half plane (LHP) as system stabilizer which their input from the rotor speed. When the system occur fault, the rotor speed should be synchronized, for this case one electrical controller is needed to make sure the system is stable.

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Xu, Xiang Zheng, and Ya Jun Dong. "Research on Harmonic Control of Electric Railway." Applied Mechanics and Materials 178-181 (May 2012): 1564–67. http://dx.doi.org/10.4028/www.scientific.net/amm.178-181.1564.

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It is necessary to suppress harmonics because of electric railway traction power supply system has serious harmonic problems. This paper has established averaging model, and the robustness of active power filter is analyzed based on the H-infinity control theory. Simulation results show that electrified railway harmonic control effect is good based on H-infinity control. And it has the fairly good stability and robustness.

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Karami, Mahdi, Norman Mariun, Mohd Amran Mohd Radzi, and Gohar Varamini. "Intelligent stability margin improvement using series and shunt controllers." International Journal of Applied Power Engineering (IJAPE) 10, no. 4 (December 1, 2021): 281. http://dx.doi.org/10.11591/ijape.v10.i4.pp281-290.

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Electric market always prefers to use full capacity of existing power system to control the costs. Flexible alternate current transmission system (FACTS) devices introduced by Electric Power Research Institute (EPRI) to increase the usable capacity of power system. Placement of FACTS controllers in power system is a critical issue to reach their maximum advantages. This article focused on the application of FACTS devices to increase the stability of power system using artificial intelligence. Five types of series and shunt FACTS controllers are considered in this study. Continuation power flow (CPF) analysis used to calculate the collapse point of power systems. Controlling parameters of FACTS devices including their locations are determined using real number representation based genetic algorithm (RNRGA) in order to improve the secure margin of operating condition of power system. The 14 and 118 buses IEEE standard test systems are utilized to verify the recommended method. The achieved results manifestly proved the effectiveness of proposed intelligent method to increase the stability of power system by determining the optimum location and size of each type of FACTS devices.

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Junaidi, Agus, and K. Abdul Hamid. "Design of Simulation Product for Stability of Electric Power System Using Power System Stabilizer and Optimal Control." Journal of Physics: Conference Series 970 (March 2018): 012013. http://dx.doi.org/10.1088/1742-6596/970/1/012013.

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Manuaba, Ida Bagus Gede, Putu Arya Mertasana, Made Mataram, and Cok Gede Indra Partha. "Improving Performance Stability of Power System Java-Bali Interconnection with PIDPSS3B and PIDSVC Controllers." Journal of Electrical, Electronics and Informatics 1, no. 1 (February 3, 2017): 17. http://dx.doi.org/10.24843/jeei.2017.v01.i01.p04.

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Modern electric power system that many its dynamic equipment continuously vulnerable to internal and external disturbances. On the condition of the disorder, it often happen oscillation in each part or between parts of the electrical system is interconnected. These oscillations become a major problem for the stability of the power system. Modern electrical control systems require a sustainable balance between power generation and demand varying loads. Power System Stabilizer and Static Var Compensator is a control device that is used to dampen low frequency oscillations and to provide additional feedback signal to stabilize the system. To increase the damping, system equipped with PSS generator that provides additional feedback to stabilize the signal in the excitation system. It is generally that the machine parameters changed by the load, so the dynamic behavior of the different machines at different operating conditions. Design PIDPSS3B power system stabilizer and PIDSVC controller used aim to get performance and optimum damping. Design and optimization of the proposed has the ability to optimally dampen and suppress errors are minimal.

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Latha, S., and C. Kala Rani. "Transient Stability Improvement with Unified Power Flow Controller Using Fuzzy Logic and ANFIS Approach." Advanced Materials Research 768 (September 2013): 378–87. http://dx.doi.org/10.4028/www.scientific.net/amr.768.378.

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Transient stability is an important aspect in planning and operation of an electric power system. The application of Fuzzy logic and Adaptive Neuro Fuzzy Inference System (ANFIS) approach to power system problems has received increased attention in recent years. This paper investigates the fuzzy logic based Unified Power Flow Control (UPFC) methods namely in-phase voltage control and quadrature voltage control in improving transient stability of power system using energy function method. The potential of the two control methods in transient stability enhancement is identified in Single Machine Infinite Bus System (SMIB) system. UPFC is connected in SMIB system in middle of the transmission line. Results indicate that significant reductions in the transient swings are obtained with UPFC. The result shows that the transient stability margin is substantially improved with in-phase voltage control higher than the quadrature voltage contro1.

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Wang, Huaiyuan, and Peican He. "Transient stability assessment and control system for power system." IEEJ Transactions on Electrical and Electronic Engineering 14, no. 8 (May 6, 2019): 1189–96. http://dx.doi.org/10.1002/tee.22917.

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Takigawa, Kiyoshi, Atushi Hamada, Kensuke Kawasaki, and Hiromu Ariyoshi. "Analysis of Stability Control of a Power System with a Distributed Constant Circuit Model." Journal of Circuits, Systems and Computers 07, no. 04 (August 1997): 221–30. http://dx.doi.org/10.1142/s0218126697000164.

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From the load cut off tests on generators, it is well known that the power disturbance is transmitted from the test point to the other points with constant delay time. The phenomena shows that the electric power system has a similar dynamic characteristic to the distributed constant circuits. In this paper, the electric power system is expressed with the distributed constant circuit, so that the main disturbance characteristics are obtained without difficulty. Moreover, the method of suppressing the plural disturbances is discussed by employing the active sink method.

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Thasnas, Natakorn, and Apirat Siritaratiwat. "Implementation of Static Line Voltage Stability Indices for Improved Static Voltage Stability Margin." Journal of Electrical and Computer Engineering 2019 (May 2, 2019): 1–14. http://dx.doi.org/10.1155/2019/2609235.

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Nowadays, the changes of economic, environment, and regulations are forcing the electric utilities to operate systems at maximum capacity. Therefore, the operation and control of power system to improve the system stability has been receiving a great deal of attention. This paper presents an approach for enhancing the static voltage stability margin and reducing the power losses of the system with voltage security-constrained optimal power flow (VSC-OPF) that is based on static line voltage stability indices. The control approaches incorporate the voltage stability criteria into the conventional OPF. The minimization of the summation of fast voltage stability index (FVSI), line stability index (Lmn), and line voltage stability index (LVSI) is used as the objective functions. The performance and effectiveness of the proposed control approaches are evaluated on the standard IEEE 30-bus, 57-bus, and 118-bus test systems under normal and contingency conditions. The comparison analysis is carried out with different cases including minimization of generation cost. The proposed control approaches indicate the promising results and offer efficient countermeasures against the voltage instability of the system.

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Wang, Huarong, and Qiyan Yan. "Research on PID control of electric traction DC motor speed based on MATLAB." Journal of Physics: Conference Series 2387, no. 1 (November 1, 2022): 012020. http://dx.doi.org/10.1088/1742-6596/2387/1/012020.

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Abstract With the development of science and technology, digital control systems are more widely used, which is more conducive to the development of intelligent power locomotives. In the speed control process of electric traction DC motor, considering the stability, rapidity, accuracy and other requirements of speed control, digital position type PID control strategy is adopted.This study first models the power traction DC motor and analyzes the performance of the system. In order to improve the performance index of the system, a digital PID control strategy is adopted.MATLAB simulation results show that the controller has good speed and stability for the speed control of electric traction DC motor.

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Stojković, Jelena, Aleksandra Lekić, and Predrag Stefanov. "Adaptive Control of HVDC Links for Frequency Stability Enhancement in Low-Inertia Systems." Energies 13, no. 23 (November 24, 2020): 6162. http://dx.doi.org/10.3390/en13236162.

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Decarbonization of power systems has put Renewable Energy Sources (RES) at the forefront when it comes to electric power generation. The increasing shares of converter-connected renewable generation cause a decrease of the rotational inertia of the Electric Power System (EPS), and consequently deteriorate the system capability to withstand large load-generation imbalances. Low-inertia systems are subjected to fast and large frequency changes in case of in-feed loss, where the traditional primary frequency control is not sufficient to preserve the frequency stability and to maintain the frequency above the critical value. One possible solution to this rising problem is seen in Fast Frequency Response (FFR) provided by the High-Voltage Direct-Current (HVDC)-based systems. This paper presents the adaptive FFR control of HVDC-based systems for frequency stability enhancement in the low-inertia system. The EPS is considered as a “black box” and the HVDC response is determined only using the locally measured frequency change. Sliding Mode Control (SMC) of the Modular Multilevel Converter (MMC) was developed and demonstrated to provide faster and more appropriate frequency response compared to the PI controller. The described adaptive HVDC control considers the size of disturbance and the inertia of the power system, and it is verified by simulations on the IEEE 39 bus test system implemented in MATLAB/Simulink for different system configurations and different sizes of disturbance.

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Balsamo, Flavio, Davide Lauria, and Fabio Mottola. "Design and Control of Coupled Inductor DC–DC Converters for MVDC Ship Power Systems." Energies 12, no. 4 (February 24, 2019): 751. http://dx.doi.org/10.3390/en12040751.

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This paper deals with the design and control aspects of modern ship power systems within the paradigm of an all-electric ship. The widespread use of power electronic converters is central in this context due to the technological advances in automation systems and the integration of the electrical propulsion systems and other components, such as electrical energy storage systems and renewable energy sources. The issue to address in this scenario is related to the request of increased performances in dynamic operation while pursuing advantages in terms of energy savings and overall system security. In addition, the presence of large load changes requires providing robustness of the control in terms of system stability. This paper is focused on medium voltage direct current (MVDC) ship power systems and the design and control of coupled inductor DC–DC converters. The load is handled in terms of a constant power model, which generally is considered the most critical case for testing the stability of the system. The robustness of the design procedure, which is verified numerically against large and rapid load variations, allowed us to confirm the feasibility and the attractiveness of the design and the control proposal.

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Cheng, Li, Dong Xu Han, Zhong Wei Li, and Dong Zheng. "Improve the Frequency Quality of Power System Using Decentralized Intelligent Loads." Applied Mechanics and Materials 291-294 (February 2013): 2187–92. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2187.

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Frequency is an indicator of the balance between electricity generation and consumption. Maintaining the frequency stability is the first of all for a stable operation of power system. After analyzing the traditional power system’s primary frequency control, secondary frequency control and tertiary frequency control, the electric heater, water heater, refrigerator, air conditioner and other domestic electric appliances are tried to use to improve the frequency quality as the decentralized intelligent loads based on the thought of “demand following supply”. The statistics of the overall power of different domestic electric appliances of several countries are given. It indicates that the domestic electric appliances can be used to improve the frequency quality from the overall power. The operating characteristics and control requirements of different domestic electric appliances are analyzed. Their control strategies are put forward and model of decentralized intelligent loads is constructed. A series of questions of technology, economic and policy that need to be solved while utilizing the decentralized intelligent loads to control the power system frequency are put forward.

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Mandrile, Fabio, Davide Cittanti, Vincenzo Mallemaci, and Radu Bojoi. "Electric Vehicle Ultra-Fast Battery Chargers: A Boost for Power System Stability?" World Electric Vehicle Journal 12, no. 1 (January 23, 2021): 16. http://dx.doi.org/10.3390/wevj12010016.

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As a consequence of the exponential growth of the electric vehicle (EV) market, DC fast-charging infrastructure is being rapidly deployed all around the world. Ultra-fast charging (UFC) stations are starting to pose serious challenges to the electric power system operation, mostly due to their high peak power demand and unregulated discontinuous operation. To address these issues, local energy storage can be installed, ensuring a smoother grid power absorption profile and allowing to provide grid-supporting features. In this work, a control solution for the grid-side AC/DC converter of next-generation EV UFC stations is proposed. A virtual synchronous compensator (VSC) control algorithm is implemented, in order to lessen the impact of the charging station on the utility and to provide the full spectrum of grid ancillary services (i.e., frequency regulation, reactive power compensation, harmonic reduction, short circuit current generation, etc.). The proposed control strategy is verified experimentally on a downscaled 15 kVA three-phase inverter, emulating the grid front-end of the charging station.

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Golov, V. P., A. V. Kalutskov, D. N. Kormilitsyn, and O. S. Sukhanova. "Aperiodic steady-state stability criterion of electric power system with controlled series compensation on 200 kV line." Vestnik IGEU, no. 6 (December 28, 2020): 14–24. http://dx.doi.org/10.17588/2072-2672.2020.6.014-024.

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Currently there is a need to synchronize operation of the electric power system in the remote areas and increase of existing lines transmission capacity. The construction of new power transmission lines involves high economic expenditures. Well-known papers consider the issues of application of controlled series compensation devices only for long-distance power transmission lines with voltage of 500 kV and higher to increase the transmission capacity and the level of stability. The aim of the study is to increase the stability and the limit of the transmitted power when controlled series compensation devices are installed on 220 kV lines. It is necessary to develop a criterion of aperiodic steady-state stability of an electric power system with a 220 kV-controlled power transmission line. Methods of mathematical modeling of electric power system, the theory of long-distance power transmission lines and electromechanical transients, and methods of analyzing electric power system stability were used. A.M. Lyapunov’s first approximation method was used to develop a simplified mathematical model. We applied the developed software as a simulation tool. An analysis was carried out to study the influence of series compensation devices regulation coefficients on the aperiodic steady-state stability of the electric power system and the transmission capacity of 220 kV power transmission lines. A change in the modulus of voltage drop at the power transmission and the angle characteristics under the influence of the regulation coefficients of the series compensation device was revealed. A criterion of aperiodic steady-state stability has been developed for systems of this kind with controlled series compensation. It differs from traditional ones by considering the changes in the voltage drop in the power transmission and it allows more accurate estimation of the proximity to the stability threshold. An assessment of aperiodic steady-state stability according to the formulated criterion for an electric power system with a controlled series compensation device on a 220 kV line was obtained. The values of the control coefficients of the series compensation device have been determined. No violation of the steady-state stability occurs under the given values. The results can be used to solve the issues of increasing the transmission capacity of transmission lines to improve the stability of the system.

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Eltamaly, Ali M., Yehia Sayed Mohamed, Abou-Hashema M. El-Sayed, and Amer Nasr A. Elghaffar. "Advanced Control Techniques for Enhance the Power System Stability at OOS Condition." Insight - Energy Science 2, no. 1 (March 27, 2019): 15. http://dx.doi.org/10.18282/i-es.v2i1.89.

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<p>The power system stability is the accurate operation of the electric grid by restoring balance after being subjected to an abnormal condition such as fault, line switching, load rejection, and loss of excitation. Protective equipment in high voltage substations should fast and precisely localize the faults. Some abnormal conditions in the power system such as out-of-step (OOS) condition which is not a real fault, but the protection equipment will consider it is. This misjudgment will cause the loss of synchronism between areas within the power system or between interconnected systems and will lead to blackout of the national grid. This paper studied the OOS condition, philosophy of protection relay device and how to avoid the false operation for distance function by Out of Step Blocking (OSB) by using the advanced protection relay, to improve the stability of power system. </p>

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Mado, Ismit, Ruslim, and Sugeng Riyanto. "A Matlab/Simulink Simulation Small Signal Stability of Single-Machine Infinite Bus Using Optimal Control Based on Load Cluster Patterns." International Journal of Electrical, Energy and Power System Engineering 3, no. 3 (October 12, 2020): 83–88. http://dx.doi.org/10.31258/ijeepse.3.3.83-88.

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Matlab/Simulink is sophisticated software that has been facilitated by MathWorks Inc. This device is increasingly being used in various fields of research. Likewise, it has great potential in the field of power system simulation. This paper presents a simulation of the optimal performance of the power generation system due to changes in load consumption. Small signal stability due to changes in electrical power usage at the load center is overcome by applying a load cluster pattern. The main objective of this research is to achieve control in a power generation system that is responsive and able to maintain stability in all operating conditions at the load center. Simulation results show the performance of optimal control of the power generation system in each load cluster. Contributions to improve the stability of the power plant system performance by 28.03 percent for frequency (F), 23.03 percent for voltage (V), and 29.5 percent for electric power (P).

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Kaliberda, I. V., S. S. Nefedov, and A. V. Pomerantsev. "Problems of Ensuring Seismic Resistance of Power Grid Facilities during Earthquakes." Occupational Safety in Industry, no. 10 (October 2020): 40–47. http://dx.doi.org/10.24000/0409-2961-2020-10-40-47.

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The electric grid system is the basis for functioning of the Unified electric power system of Russia and technologically isolated electric power systems. One of the most serious problems in the electric power industry is the aging of the fixed assets of already built and operating power grid facilities. The second problem is to clarify the seismic hazard of the territories of the Russian Federation in the direction of its growth. As a result, the number of power grid facilities fall into the zones of increased seismic hazard. In the zone of 7 points or more, approximately 30 % of the entire length of electric networks and transformer capacities are located. Information is provided about the characteristics of seismic load and how the objects respond to an earthquake. The experience of earthquakes testifies to the high vulnerability of the overhead power lines, cable power lines, substations, power transformers, relay protection equipment and automation under intense seismic loads. Information is provided about massive damage to the power grid during earthquakes in the territory of Russia, Armenia, and other countries of the world. Frequently occurring short circuits during earthquakes in electrical networks, at transformer substations, in electrical equipment elements of power grid facilities lead to fires. It is determined that power grid facilities have less seismic resistance than electric power generation facilities, than buildings and structures where electrical equipment is located. The problem of insufficiency of the current regulatory framework for ensuring seismic resistance of electric power facilities was also identified. Possible measures to prevent accident rate and increase the resistance, reliability, and seismic stability of power grid facilities in case of earthquakes are considered. The development of normative regulation will allow to take measures to ensure the seismic stability of power grid facilities in operation, and to ensure that control and supervision activities are carried out at a higher level.

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Gopinath, B., S. Suresh Kumar, and Juvan Michael. "Stability Improvement in Power Systems Using Unified Power Flow Controller (UPFC)." Advanced Materials Research 768 (September 2013): 392–97. http://dx.doi.org/10.4028/www.scientific.net/amr.768.392.

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Flexible AC transmission system (FACTS) is a system composed of static equipments used for ac transmission of electric energy to improve the power transfer capability and to enhance controllability of interconnected network. Unified Power Flow Controller (UPFC) is the most widely used FACTS device for providing fast acting reactive power compensation on high voltage electricity transmission network. This paper deals with the designing of Adaptive Neuro Fuzzy Inference controller (ANFIC) and fuzzy based Particle Swarm Optimization (PSO) controller for the performance analysis of UPFC. The controller have been designed and tested for controlling the real and reactive power of UPFC. Fuzzy-PI controller is used to control the shunt part of UPFC. The system response under high short circuit level is tested on 5-bus system and 118-bus system. Computer simulation by MATLAB/SIMULINK has been used to verify proposed control strategies.

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Chen, Hao, Ya Li Yang, and Li Hua Chen. "Study on Boosting Curve for Electric Power Steering System Based on ADAMS." Advanced Materials Research 97-101 (March 2010): 3308–13. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.3308.

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Electric Power Steering (EPS) is a full electric system, which reduces the amount of steering effort by directly applying the output from an electric motor to the steering system. This research aims at developing EPS boost curve embody into the assist characteristics, improving steer portability and stability. A model for the EPS system has been established, including full vehicle mechanical system, EPS mechanical system, and EPS electric control system. Based on this model, a straight line boost curve was designed and evaluated in this environment to improve the performance of EPS system. Results showed that EPS system with the designed boost curve improved light steering feeling and increased vehicle’s steering stability, and can meet the requirements of steering performance.

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Bilir, Bülent, M. Kemal Sarioǧlu, and Suat Ertem. "Modeling of a large electric power system for optimal control of dynamic stability." Electric Power Systems Research 30, no. 3 (September 1994): 191–96. http://dx.doi.org/10.1016/0378-7796(94)00854-x.

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Ma, Xiaguang, Dahai Yu, Ming Nian, and Zhenhua Xu. "Influence of moment of inertia on electric power system security and stability control." Journal of Engineering 2019, no. 16 (March 1, 2019): 1164–66. http://dx.doi.org/10.1049/joe.2018.8793.

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El-Kishky, Hassan, and Hadi Ebrahimi. "On modeling and control of advanced aircraft electric power systems: System stability and bifurcation analysis." International Journal of Electrical Power & Energy Systems 63 (December 2014): 246–59. http://dx.doi.org/10.1016/j.ijepes.2014.05.074.

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Ahmadi Kamarposhti, Mehrdad, Hassan Shokouhandeh, Yahya Gholami Omali, Ilhami Colak, Phatiphat Thounthong, and William Holderbaum. "Optimal Coordination of TCSC and PSS2B Controllers in Electric Power Systems Using MOPSO Multiobjective Algorithm." International Transactions on Electrical Energy Systems 2022 (November 28, 2022): 1–18. http://dx.doi.org/10.1155/2022/5233620.

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Oscillations are an intrinsic phenomenon in interconnected power systems, leading to steady-state stability, safety decline, transmission power limitation, and electric power systems’ ineffective exploitation by developing power systems, particularly by connecting these systems to low-load lines. In addition, they affect the economic performance of the systems. In this study, PSS2B power system stabilizers and TCSC compensators are used to improve the stability margin of power systems. In order to coordinate TCSC compensators, the MOPSO multiobjective algorithm with integral of the time-weighted absolute error (ITAE) and figure of demerit (FD) objective functions was used. The MOPSO algorithm optimization results are compared with nondominated sorting genetic algorithm (NSGAII) and multiobjective differential evolution (MODE) algorithms. The optimization results indicated a better performance of the proposed MOPSO algorithm than NSGAII and MODE. The simulations were iterated in two scenarios by creating different loading conditions in generators. The results indicated that the proposed control system, where the coordination between PSS2B power system stabilizers and TCSC compensators using the MOPSO algorithm, is better than power systems in which PSS2B Stabilizers or TCSC compensators are utilized solely. All criteria, e.g., ITAE, FD, maximum deviation range, and the required time for power oscillation damping in hybrid control systems, have been obtained. This means more stability and accurate and proper performance.

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Anderson, P. M. "Power System Control and Stability [Boooks and Reports]." IEEE Power Engineering Review 15, no. 3 (March 1995): 40. http://dx.doi.org/10.1109/mper.1995.365077.

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Ali, Muhammad Bilal, Syed Ali Abbas Kazmi, Zafar A. Khan, Abdullah Altamimi, Mohammed A. Alghassab, and Bader Alojaiman. "Voltage Profile Improvement by Integrating Renewable Resources with Utility Grid." Energies 15, no. 22 (November 16, 2022): 8561. http://dx.doi.org/10.3390/en15228561.

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There are three main parts of an electric power system—power generation, transmission, and distribution. For electric companies, it is a tough challenge to reduce losses of the power system and deliver lossless and reliable power from the generating station to the consumer end. Nowadays, modern power systems are more complex due to gradually increasing loads. In the electrical power system, especially in transmission and distribution networks, there are power losses due to many reasons such as overloading of the line, long distribution lines, low power factors, corona losses, and unsuitable conductor size. The main performance factor of the power system is reliability. Reliability means continuity of the power supply without any interruptions from the generating station to the demand side. Thus, due to these power losses, there are voltage stability problems and economic losses in the electrical system. The voltage stability of the power system can be increased by improving the voltage profile. In this paper, different techniques are analyzed that include the integration of wind power, the integration of photovoltaic power, and reactive power injection by integrating FACTS devices. These techniques are applied to the IEEE 57 bus system with standard data using simulation models developed in MATLAB. Thus, the results of the analysis of these techniques have been compared with each other.

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Raga, Lázaro, Barrado, Martín-Lozano, and Quesada. "Step-by-step Small-Signal Modeling and Control of a Light Hybrid Electric Vehicle Propulsion System." Energies 12, no. 21 (October 25, 2019): 4082. http://dx.doi.org/10.3390/en12214082.

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This paper develops step-by-step a complete electric model of a light hybrid electric vehicle propulsion system. This model includes the vehicle mass, the radius and mass of the wheels, the aerodynamic profile of the vehicle, the electric motor and the motor drive, among other elements. Each element of the model is represented by a set of equations, which lead to getting an equivalent electric circuit. Based on this model, the outer and inner loop compensators of the motor drive control circuit are designed to provide stability and a fast dynamic response to the system. To achieve this, the steady-state equations and the small-signal model of the equivalent electric circuit are also obtained. Furthermore, as these elements are the main load of the power distribution system of the fully electric and light hybrid electric vehicle, the input impedance model of the set composed of the input filter, the motor drive, the motor, and the vehicle is presented. This input impedance is especially useful to get the system stability of the entire power distribution system.

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Nan, Yu Rong, and Na Meng. "Three-Phase Power Factor Correction Converter Based on One-Cycle Control in Aircraft Electric Power System." Advanced Materials Research 97-101 (March 2010): 2903–8. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2903.

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Traditional three-phase PFC converters based on one-cycle control (OCC) exhibit instabi- lity at light load conditions.This will cause much more harmonic current which is harmful to the syterm.To overcome this disadvantage, this paper introduces a modified three-phase power factor correction(PFC) converter based on one-cycle control in aircraft electric power system. The input voltage multiplies a gain and its result is added to the actual sensed current,then the sum of them is compared with the sawtooth waveform to yield switching signal.This is the modified contorl mathod. Finally the MATLAB simulations at heavy and light loads as well as the transfer between them are carried. The simulation results show that the improved control circuit can achieve unity power factor and exhibit stability at light loads.

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Journal articles on the topic 'Electric power system stability Control'

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