Готові списки джерел за темами / AC/DC Security; Stability

Добірка наукової літератури з теми "AC/DC Security; Stability"

Автор: Grafiati
Опубліковано: 7 липня 2024

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  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій

Статті в журналах з теми "AC/DC Security; Stability":

1

Zhang, Qiufang, Zheng Shi, Ying Wang, Jinghan He, Yin Xu, and Meng Li. "Security Assessment and Coordinated Emergency Control Strategy for Power Systems with Multi-Infeed HVDCs." Energies 13, no. 12 (June 19, 2020): 3174. http://dx.doi.org/10.3390/en13123174.

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Short-circuit faults in a receiving-end power system can lead to blocking events of the feed-in high-voltage direct-current (HVDC) systems, which may further result in system instability. However, security assessment methods based on the transient stability (TS) simulation can hardly catch the fault propagation phenomena between AC and DC subsystems. Moreover, effective emergency control strategies are needed to prevent such undesired cascading events. This paper focuses on power systems with multi-infeed HVDCs. An on-line security assessment method based on the electromagnetic transient (EMT)-TS hybrid simulation is proposed. DC and AC subsystems are modeled in EMTDC/PSCAD and PSS/E, respectively. In this way, interactions between AC and DC subsystems can be well reflected. Meanwhile, high computational efficiency is maintained for the on-line application. In addition, an emergency control strategy is developed, which coordinates multiple control resources, including HVDCs, pumped storages, and interruptible loads, to maintain the security and stability of the receiving-end system. The effectiveness of the proposed methods is verified by numerical simulations on two actual power systems in China. The simulation results indicate that the EMT-TS hybrid simulation can accurately reflect the fault propagation phenomena between AC and DC subsystems, and the coordinated emergency control strategy can work effectively to maintain the security and stability of systems.
2

An, Wenjing, Yuanchao Yang, and Geyi Wu. "Research on optimal power flow of AC/DC hybrid system for civil more electric aircraft." Journal of Physics: Conference Series 2741, no. 1 (April 1, 2024): 012017. http://dx.doi.org/10.1088/1742-6596/2741/1/012017.

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Abstract Modern civil more electric aircraft often use AC/DC systems instead of AC systems to reduce the weight of the power system. Compared with the AC/DC system of the land power grid, the aircraft power system needs to pursue economic operation mode under more complex security constraints. This paper establishes the optimal power flow model of the AC/DC hybrid system of more electric aircraft, which takes minimizing the active power loss of the line as the optimization objective, including the steady-state operation constraints and security constraints of the AC/DC system. The interior point method and prediction correction interior point method are used to solve the model. Then, based on the simplified steady-state model of the B787 power system, the model and algorithm are verified by experiments. The experimental results show that by optimizing the power flow distribution of the power system, the power utilization efficiency of the system has been significantly improved, and its stability and reliability can also be better guaranteed.
3

Wang, Bao Hua, and Zhong Ke Shi. "Dynamic Adaptive Sliding Mode DC Power Modulation Controller in Parallel AC/DC Transmission System." Advanced Materials Research 433-440 (January 2012): 6783–88. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.6783.

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The effective DC power modulation controller influences the security and stability of AC/DC interconnected power system significantly. Based on the direct feedback linearization model of parallel AC/DC transmission system, the DC power modulation controller is designed by using the dynamical adaptive sliding mode control designing method. Using an adaptive technique to estimate the switching control gain and damping coefficient, the dynamical sliding surface is proposed to eliminate tremble. The proposed adaptive sliding mode control scheme can be implemented without the requirement that the bounds of the uncertainties and the disturbances should be known in advance; meanwhile its design is very simple. The simulation results show that this proposed controller is superior to the nonlinear H∞ DC power modulation controller in damping oscillation and robustness.
4

Piao, Longjian, Laurens de Vries, Mathijs de Weerdt, and Neil Yorke-Smith. "Electricity Markets for DC Distribution Systems: Design Options." Energies 12, no. 14 (July 10, 2019): 2640. http://dx.doi.org/10.3390/en12142640.

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DC distribution systems (DCDSs) are a promising alternative to AC systems because they remove AC-DC conversions between renewable sources and loads. Their unique features compared to AC include low system inertia, strict power limits and power–voltage coupling. In a liberalised electricity market, merely applying an AC market design to a DCDS cannot guarantee the latter’s supply security and voltage stability; new markets must be designed to meet DC challenges. This article identifies the key design options of DCDS electricity markets. To identify these options, we develop a comprehensive design framework for local electricity markets; to our knowledge, we provide the first such analysis. Whereas previous studies focus on separate aspects of DCDS markets, we widen the scope to include the role of market architecture and investigate the arrangements of sub-markets. As an illustration, we demonstrate three promising DCDS market designs that can be defined in our framework, and provide a first assessment of their performance.
5

Zhang, Ningyu, Shengjun Wu, Haiyun An, and Xinyao Zhu. "Security-Constraint Unit Commitment for AC/DC Transmission Systems with Voltage Stability Constraint." Journal of Electrical Engineering & Technology 15, no. 6 (September 7, 2020): 2459–69. http://dx.doi.org/10.1007/s42835-020-00521-7.

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6

Zhang, Ningyu, Qian Zhou, and Haoming Hu. "Minimum Frequency and Voltage Stability Constrained Unit Commitment for AC/DC Transmission Systems." Applied Sciences 9, no. 16 (August 19, 2019): 3412. http://dx.doi.org/10.3390/app9163412.

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An increased use of the high-voltage direct current (HVDC) technologies can have important effects on frequency performance and voltage stability of the receiving-end grid during normal operation as well as during blocking failure. The main reasons are the inherent characteristics of the HVDC such as its much larger capacity than thermal plants and lack of voltage supporting ability to the alternating current (AC) grid. These has led to new challenges for AC/direct current (DC) power grid operators in terms of ensuring power system security. To address these challenges, a unit commitment (UC) of the receiving-end in the AC/DC hybrid grid is presented in this paper. In the proposed model, primary frequency modulation constraints are added to provide sufficient capacity for HVDC blocking. Besides, grid security constraint after secondary frequency regulation is also considered because HVDC blocking failure would cause large range power transfer and transmission lines overload. Meanwhile, voltage stability constraints are employed to guarantee enough voltage supporting capacity from thermal plants at the HVDC feed-in area. Based on the characteristics of the model, Benders decomposition and mixed integer programming algorithm are used to get the optimal transmission power of the HVDC and schedule of thermal units. The study is done by considering the IEEE-39 and Jiangsu power grid in eastern China, containing two HVDC transmission projections respectively. The results are also validated by simulation of different HVDC blocking failure scenarios.
7

Weijie, Zheng, Xu Dechao, Chen Yong, Zhang Xing, and Mu Qing. "Multi Step Transient Hybrid Simulation Framework Design and Practical Engineering Application for AC / DC Power Grid." E3S Web of Conferences 256 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202125601010.

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Based on the large power grid simulation and the existing security prevention and control mode, this paper further integrates the multi-step transient hybrid simulation architecture computing technology to research the high-performance analysis and situational awareness simulation technology of interconnected AC / DC large power grid security and stability characteristics. So as to realize the “panoramic situational awareness, wide area coordinated control, flexible and efficient service” of large power grid, and improve the super large scale power grid Comprehensive security defense and intelligent monitoring level of panoramic, multi-dimensional and three-dimensional.
8

Dhumal, S. D., and Dr P. V. Paratwar. "Estimating the Stability of an AC-DC Hybrid Micro Grid with Multilayer Power Flow While Using Interconnected Converter." International Journal for Research in Applied Science and Engineering Technology 11, no. 6 (June 30, 2023): 1615–22. http://dx.doi.org/10.22214/ijraset.2023.52662.

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Abstract: Regionalized networks, also known as micro grids, must be able to operate independently by cutting off their connection to the main grid in order for a system to stay stable. Customers' reliability can be raised by providing a more robust power supply. Due to reversed energy flow from distributed generator units, regional fluctuations, temporary micro grid modes, significant frequency discrepancies in electrically isolated mode operation, as well as financial and supply demand uncertainties, consistency, dependability, and security are in fact the main problems with micro grids. The system is more unstable when electrical energy is transmitted from the AC side to the DC side and from the DC side to the AC side, despite the fact that strengthening the stability of the hybrid micro grid is their main objective. Therefore, a variety of circuit breakers, buck boost converters, grid bidirectional converters, and intermediate IC (Interlinking converter) are utilized to preserve the stability of the hybrid micro grid. This article explains how to build a bidirectional power flow through an interactive converter using stability evaluation using MATLAB. Simulation may improve the circuit's performance for the best outcomes achievable. The most stable hybrid micro grid findings were shown. An interlinking converter is utilized in this work to improve micro grid stability while power is flowing via the AC and DC grids in both directions. The findings might be acquired using a MATLAB simulation. This method also has the advantage of reducing the amount of time needed for the system to stabilize. Consequently, the system will be more dependable and will provide excellent supplies.
9

Yan, Wei, Chong Ding, Zhouyang Ren, and Wei-Jen Lee. "A Continuation Power Flow Model of Multi-Area AC/DC Interconnected Bulk Systems Incorporating Voltage Source Converter-Based Multi-Terminal DC Networks and Its Decoupling Algorithm." Energies 12, no. 4 (February 22, 2019): 733. http://dx.doi.org/10.3390/en12040733.

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Existing continuation power flow (CPF) models mainly focus on the regional independent systems, which are not suitable for multi-area AC/DC interconnected systems because the market trading behaviors and security control for power allocation of tie-lines are ignored. This study presents a novel CPF model and its decoupling algorithm for multi-area AC/DC interconnected systems incorporating a voltage source converter (VSC)-based multi-terminal direct current (MTDC) network. This CPF model includes the following unique features: (1) In view of the bilateral power trading contracts among regional subsystems, the nonlinear constraint equations of directional trading active power via interface are derived, and the multi-balancing machine strategy is introduced to realize the active power balance of each subsystem. (2) An accurate simulation method for the security control behaviors of the power allocation in tie-lines is proposed, which includes a specific selection strategy for automatic generation control units and a generation re-dispatch strategy. These two strategies work together to prevent the serious overload in tie-lines during load growth and improve the voltage stability margin of the interconnected bulk systems. (3) The switching characteristic of reactive power control behaviors of VSC stations is simulated in the CPF calculation. In the end, a novel decoupling CPF algorithm based on bi-directional iteration is presented to realize the decomposition and coordination calculation. This decoupling algorithm preserves the precision and convergence of integrated CPF algorithms, and it has an apparent advantage on the calculation speed. Furthermore, this decoupling algorithm also can easily reflects the effects of the control mode changes of VSC stations to the voltage stability margin of AC system. Case studies and comparative analysis on the IEEE two-area RTS-96 system indicate the effectiveness and validity of the proposed CPF model and corresponding decoupling algorithm.
10

Wang, Yanwen, Lingjie Wu, and Shaoyang Chen. "Study on the Mode and Characteristics of SSOs in Hybrid AC–DC Transmission Systems via Multitype Power Supply." Sustainability 15, no. 8 (April 17, 2023): 6763. http://dx.doi.org/10.3390/su15086763.

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The impact of subsynchronous oscillation (SSO) on grid security is becoming increasingly prominent with the rapid development of a large new energy base. However, the SSO modes and characteristics in complex power systems where series-complementary AC systems, DC systems, wind farms, and thermal power plants co-exist simultaneously are still not well understood, and relevant research has yet to be conducted. To address these issues, this study aims to investigate the SSO oscillation modes and the participation of specific influencing factors using eigenvalue and participation factor analysis. Additionally, the influence of system operation mode and control parameters on the SSO characteristics is studied through eigenvalue analysis. The findings of this study suggest that multiple oscillation sources and the co-existence of various oscillation patterns in hybrid AC–DC transmission systems cause SSO problems. The SSOs arise due to inappropriate system operation or parameter selection. As the series compensation increases, the system tends to become unstable. The system stability improves when the wind power output increases or the thermal power output decreases while keeping the output power of other sources constant. On the other hand, the system stability decreases as the DC transmission power gradually decreases. In terms of the control parameters, a higher value of the inner-loop proportionality coefficient of the converter current on the rotor side of the wind turbine results in a more unstable system. However, the rotor-side converter outer loop parameters and the stator-side control loop PI parameters have a negligible effect on the oscillation frequency and damping of the system. Matlab time domain simulations are conducted to verify the accuracy of the theoretical analysis.
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Статті в журналах Дисертації

Дисертації з теми "AC/DC Security; Stability":

1

Bakhos, Gianni. "Gestion de la sécurité du réseau électrique AC & DC : évaluation et amélioration." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT014.

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L'intégration des Énergies Renouvelables pose aujourd'hui des problèmes de congestion et d'incertitude sur le réseau électrique vu l'intermittence et l'imprévisibilité de ce type d'énergie. De plus, pour des questions de rentabilité et d'efficacité, la puissance produite à partir du renouvelable est transmise sous forme de Haute Tension en Courant Continu (HVDC). Un nouveau concept a donc émergé, celui de la fusion d'interconnexions HVDC dans un réseau maillé existant et ceci apportera plus de flexibilité dans le fonctionnement du système global. Le résultat : une hybridation du système de transmission d'électricité avec des interactions mutuelles importantes entre système AC existant et DC intégré. Si les problèmes de stabilité du réseau AC sont aujourd'hui identifiés, ceux du système hybride doivent encore être étudiés puisque l'intégration de convertisseurs de puissance commandables et contrôlables rapidement pourrait modifier le comportement du système entier. De ce fait, ce projet de thèse cherche à établir une étude innovante englobant tout le système hybride AC/DC. Celle-ci portera tout d'abord sur une évaluation de la sécurité prenant en compte les contraintes opérationnelles et la capacité du système à atteindre un nouvel équilibre. En outre, cette thèse relèvera les défis de stabilisation du système hybride global. Pour cela, les missions consisteront en une étude préliminaire de l'état de l'art : quelles nature physique des problèmes d'instabilité du système AC ? Quels types et gammes de perturbations à considérer pour l'évaluation de la stabilité ? Finalement, quels modélisation et contrôle du système HVDC ? Tout cela permettra de développer un outil inclusif d'évaluation de la sécurité prenant en compte différentes méthodes de contrôle du système. Une analyse sera également faite pour comprendre l'influence des paramètres et des méthodes de contrôle adoptés. Cela nous aidera à mettre en place un moyen de contrôle systématique pour améliorer la sécurité du réseau et optimiser la distribution de la puissance à travers un réseau Multi-Terminal DC
Today, the integration of renewable energies poses problems of congestion and uncertainty on the electricity network, given the intermittency and unpredictability of this type of energy. What's more, for reasons of profitability and efficiency, the power generated from renewables is transmitted in the form of High Voltage Direct Current (HVDC). A new concept has therefore emerged, that of merging HVDC interconnections into an existing meshed network, which will bring greater flexibility to the operation of the overall system. The result is a hybrid electricity transmission system with significant mutual interactions between the existing AC system and the integrated DC system. While the stability problems of the AC network have now been identified, those of the hybrid system still need to be studied, since the integration of rapidly controllable power converters could modify the behaviour of the entire system. As a result, this thesis project seeks to establish an innovative study encompassing the entire AC/DC hybrid system. This will focus on a security assessment that takes into account operational constraints and the ability of the system to reach a new equilibrium. In addition, this thesis will address the stabilisation challenges of the overall hybrid system. To this end, the assignments will consist of a preliminary study of the state of the art: what is the physical nature of the instability problems of the AC system? What types and ranges of disturbances should be considered for stability assessment? Finally, what modelling and control of the HVDC system? All of this will enable the development of an inclusive security assessment tool that takes into account different system control methods. An analysis will also be carried out to understand the influence of the parameters and control methods adopted. This will help us to implement a systematic means of control to improve network security and optimise power distribution across a Multi-Terminal DC network
2

Salehi, Pour Mehr Vahid. "Development and Verification of Control and Protection Strategies in Hybrid AC/DC Power Systems for Smart Grid Applications." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/804.

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Modern power networks incorporate communications and information technology infrastructure into the electrical power system to create a smart grid in terms of control and operation. The smart grid enables real-time communication and control between consumers and utility companies allowing suppliers to optimize energy usage based on price preference and system technical issues. The smart grid design aims to provide overall power system monitoring, create protection and control strategies to maintain system performance, stability and security. This dissertation contributed to the development of a unique and novel smart grid test-bed laboratory with integrated monitoring, protection and control systems. This test-bed was used as a platform to test the smart grid operational ideas developed here. The implementation of this system in the real-time software creates an environment for studying, implementing and verifying novel control and protection schemes developed in this dissertation. Phasor measurement techniques were developed using the available Data Acquisition (DAQ) devices in order to monitor all points in the power system in real time. This provides a practical view of system parameter changes, system abnormal conditions and its stability and security information system. These developments provide valuable measurements for technical power system operators in the energy control centers. Phasor Measurement technology is an excellent solution for improving system planning, operation and energy trading in addition to enabling advanced applications in Wide Area Monitoring, Protection and Control (WAMPAC). Moreover, a virtual protection system was developed and implemented in the smart grid laboratory with integrated functionality for wide area applications. Experiments and procedures were developed in the system in order to detect the system abnormal conditions and apply proper remedies to heal the system. A design for DC microgrid was developed to integrate it to the AC system with appropriate control capability. This system represents realistic hybrid AC/DC microgrids connectivity to the AC side to study the use of such architecture in system operation to help remedy system abnormal conditions. In addition, this dissertation explored the challenges and feasibility of the implementation of real-time system analysis features in order to monitor the system security and stability measures. These indices are measured experimentally during the operation of the developed hybrid AC/DC microgrids. Furthermore, a real-time optimal power flow system was implemented to optimally manage the power sharing between AC generators and DC side resources. A study relating to real-time energy management algorithm in hybrid microgrids was performed to evaluate the effects of using energy storage resources and their use in mitigating heavy load impacts on system stability and operational security.
3

Eriksson, Robert. "Security-centered Coordinated Control in AC/DC Transmission Systems." Licentiate thesis, Stockholm : Royal Institute of Technology, 2008. http://kth.diva-portal.org/smash/record.jsf?searchId=4&pid=diva2:101.

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4

Gonzalez-Torres, Juan Carlos. "Transient stability of high voltage AC-DC electric transmission systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS041.

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Les nouvelles politiques adoptées par les autorités nationales ont encouragé pendant les dernières années l'intégration à grande échelle des systèmes d'énergie renouvelable (RES). L'intégration à grande échelle des RES aura inévitablement des conséquences sur le réseau de transport d'électricité tel qu'il est conçu aujourd'hui, car le transport de l'électricité massif sur de longues distances pourrait amener les réseaux de transport à fonctionner près de leurs limites, réduisant ainsi leurs marges de sécurité. Des systèmes de transport d’électricité plus complexes seront donc nécessaires.Dans ce scénario, les systèmes de transmission à Courant Continu Haute Tension (HVDC) constituent la solution la plus intéressante pour le renforcement et l'amélioration des réseaux à Courant Alternatif (AC) existants, non seulement en utilisant des configurations point à point, mais aussi dans des configurations multi-terminales. L'introduction des systèmes HVDC aboutira à terme à un réseau électrique hybride haute tension AC/DC, qui doit être analysé comme un système unique afin de mieux comprendre les interactions entre le réseau AC et le réseau DC.Cette thèse porte sur l'analyse de la stabilité transitoire des systèmes de transmission électrique hybrides AC/DC. Plus particulièrement, deux questions ont été abordées: Quel est l'impact d'un défaut du réseau DC sur la stabilité transitoire du réseau AC? Comment est-il possible de se servir des systèmes de transmission DC en tant qu'actionneurs afin d'améliorer la stabilité transitoire AC ?Dans la première partie de ce travail, les modèles mathématiques du réseau hybride AC/DC sont décrits ainsi que les outils nécessaires à l'analyse du système en tenant compte de sa nature non linéaire. Ensuite, une analyse approfondie de la stabilité transitoire du réseau électrique dans le cas particulier d'un court-circuit dans le réseau DC et l'exécution des stratégies de protection correspondantes sont effectuées. En complément, des indicateurs de stabilité et des outils pour dimensionner les futurs réseaux de la MTDC afin de respecter les contraintes des stratégies de protection existantes sont proposés.La deuxième partie de la thèse porte sur les propositions de commande pour la modulation des références de puissance des systèmes de transmission HVDC dans le but d'améliorer la stabilité transitoire du système AC connecté à ce réseau DC. Tout d'abord, nous axons notre étude sur le contrôle non linéaire des liaisons HVDC point à point dans des liaisons hybrides AC/DC. La compensation rapide des perturbations de puissance, l'injection de puissance d'amortissement et l'injection de puissance de synchronisation sont identifiées comme des mécanismes par lesquels les systèmes HVDC peuvent améliorer les marges de stabilité des réseaux AC.Enfin, une stratégie de contrôle pour l'amélioration de la stabilité transitoire par injection de puissance active dans par un réseau MTDC est proposée. Grâce à la communication entre les stations, la commande décentralisée proposée injecte la puissance d'amortissement et de synchronisation entre chaque paire de convertisseurs en utilisant uniquement des mesures au niveau des convertisseurs. L'implémentation proposée permet d'utiliser au maximum la capacité disponible des convertisseurs en gérant les limites de puissance d'une manière décentralisée
The new policy frameworks adopted by national authorities has encouraged the large scale-integration of Renewable Energy Systems (RES) into bulk power systems. The large-scale integration of RES will have consequences on the electricity transmission system as it is conceived today, since the transmission of bulk power over long distances could lead the existing transmission systems to work close to their limits, thus decreasing their dynamic security margins. Therefore more complex transmissions systems are needed.Under this scenario, HVDC transmission systems raise as the most attractive solution for the reinforcement and improvement of existing AC networks, not only using point-to-point configurations, but also in a Multi-Terminal configuration. The introduction of HVDC transmission systems will eventually result in a hybrid high voltage AC/DC power system, which requires to be analyzed as a unique system in order to understand the interactions between the AC network and the DC grid.This thesis addresses the transient stability analysis of hybrid AC/DC electric transmission systems. More in particular, two questions sought to be investigated: What is the impact of a DC contingency on AC transient stability? How can we take advantage of the of DC transmission systems as control inputs in order to enhance AC transient stability?In the first part of this work, the mathematical models of the hybrid AC/DC grid are described as well as the necessary tools for the analysis of the system taking into account its nonlinear nature. Then, a thorough analysis of transient stability of the power system in the particular case of a DC fault and the execution of the corresponding protection strategies is done. As a complement, stability indicators and tools for sizing future MTDC grids in order to respect the constraints of existing protection strategies are proposed.The second part of the thesis addresses the control proposals for the modulation of power references of the HVDC transmission systems with the purpose of transient stability enhancement of the surrounding AC system. Firstly, we focus our study in the nonlinear control of point-to-point HVDC links in hybrid corridors. Fast power compensation, injection of damping power and injection of synchronizing power are identified as the mechanisms through which HVDC systems can improve stability margins.Finally, a control strategy for transient stability enhancement via active power injections of an MTDC grid is proposed. Using communication between the stations, the proposed decentralized control injects damping and synchronizing power between each pair of converters using only measurements at the converters level. The proposed implementation allows to fully use the available headroom of the converters by dealing with power limits in a decentralized way
5

Obradovic, Danilo. "Coordinated Frequency Control Between Interconnected AC/DC Systems." Licentiate thesis, KTH, Elkraftteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280156.

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With ambitions of reducing the environmental pollution, power systems integrate larger shares of Renewable Energy Sources (RES) to phase out conventional thermal and nuclear generators. Since RES (such as wind and solar power) are connected to the grid through power electronics devices, they do not inherently contribute to system inertia. With decreasing inertia, the Instantaneous Frequency Deviation (IFD), which follows a power unbalance, is significantly impacted. Frequency Containment Reserves (FCR) are designed to provide a fast dynamic response, counteract power imbalances and stabilize the frequency within a short time interval. Besides inertia, the significant factors affecting frequency behavior are the available amount of FCR and the capability of their fast and stable response. System operators define the list of requirements that a generating unit has to satisfy to participate in FCR. Generators, which are the major part of FCR, have different governors and turbines properties. This study assesses the dynamical performance of typical generators in both open-loop testing and closed-loop varying inertia systems. The goal is to evaluate if specific FCR requirements present a sufficient condition for the desired response, and which governor properties are capable of satisfying them. As an additional, and sometimes necessary, support to FCR, HVDC interconnections are utilized in the form of Emergency Power Control (EPC). This thesis investigates which of the EPC methods performs appropriately in terms of IFD improvement, closed-loop stability, and power and energy provided. The analysis is a continuation from the previous investigation on FCR, and mainly compare two EPC methods related to Nordic Power System (NPS) test case: ramp/step method which is currently implemented in the NPS, and droop frequency-based EPC, proposed by this study for the future operation in the NPS. Apart from ensuring a proper system frequency response, the influence of implemented HVDC supplementary active power control is analyzed to rotor angle stability. In further, this thesis presents a comprehensive analysis of the impact that proposed HVDC supplementary power control has on the linearized dynamics of power systems. By building a generic system, this analytical study is the first of its kind that includes both higher order generator dynamics, and local angle/frequency input of the controller. The methodological approach here analytically formulates the impact the HVDC supplementary control has mainly on the generator synchronizing and damping torque components. The positive impact of the droop frequency-based HVDC power support is highlighted using both single and multi-machine systems. In that way, the implementation of desired droop frequency-based HVDC control to mainly improve system frequency is motivated furthermore. It shows that a proper HVDC supplementary control may impose the various positive impacts for future variable and low inertia scenarios, and ensure a proper power system sustainability.

QC 20200907


multiDC - Advanced Control and Optimization Methods for AC and HVDC Grids
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Wang, Hualei. "The protection of transmission networks containing AC and DC circuits." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655718.

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Анотація:
In 14th August 2003, the Northeast USA suffered its worst power outage event in history. The power disturbance spreading through the system caused mal-trips of the distance relay remote back-up protections, which indeed contributed to the power outage cascading a wide area. The power outage in the Northeast USA was constrained by the presence of HVDC interconnections between the HVAC networks in Ontario and New York. The system collapse did not progress beyond the HVDC interconnection interface with Quebec. The HVDC link can regulate the voltage and current therefore impacts on the performance of the protection and system stability. The distance relay mal-operations were one of the main cause of the Northeast USA blackout as well as the other recent major large area blackouts which were pointed out by the previous papers. This thesis is focus on investigate how HVDC interconnections contribute to maintaining the power system stability. The research work investigated the performance of a distance relay to faults and disturbance on networks containing HVDC interconnection. The research work was carried out by modelling and testing a classic signal processing distance relay in a simple AC network which was based on Kunder’s two areas system using MATLAB/SIMULINK at first. Then the modeled distance relay’s performance was investigated by combining the distance relay and a simple HVDC link based on the Kunder’s two areas system. The research work firstly combined the signal processing distance relay and the HVDC link together to investigate the distance relay’s performance when the protected feeder containing DC link. The distance relay’s performance was investigated when the protected feeders containing HVDC link under fault conditions and power swing conditions. For comparison, a similar power system without HVDC link was also simulated.
7

Martínez, Sanz Inmaculada. "Control of AC/DC systems for improved transient stability and frequency support provision." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/25956.

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In this thesis, control of future AC/DC systems for improved system dynamic performance is studied. The objective is to determine mechanisms for providing AC network services (e.g. frequency support, damping, etc.) through coordinated control of HVDC power converters and FACTS devices while considering increased levels of wind generation. In particular, this work addresses some of the concerns associated with the stability of the future Great Britain (GB) transmission network as it evolves to support low carbon generation scenarios and the use of DC grids to integrate offshore renewable resources and form a sub-sea interconnection across Europe. The contributions of this thesis are in two main areas: emergency control for power system stabilization and exchange of frequency support across a DC grid. Fast control of FACTS devices and HVDC links can be exercised as a post-fault corrective action to maintain system stability without the need of constraining pre-fault transfer levels. This work employs a model predictive control (MPC) scheme that relies on system wide-area measurements to preserve the system stability after critical contingencies. MPC can explicitly account for system constraints and changing operating conditions and is therefore suited for on-line applications and power electronic actuators with limited short-term overload capability. The effectiveness of the proposed approach is demonstrated using time domain simulations on representative equivalent models of the future GB transmission network. A detailed analysis of the dynamic behaviour and stability issues associated with the GB transmission grid have also been presented. In the DC grid context, this thesis investigates the provision of frequency services considering frequency droop loops in the control of the converters. The interaction between onshore AC systems and a DC grid is analyzed through an extended steady-state formulation. A methodology for providing frequency response from offshore wind farms connected through a DC grid is also proposed. The performance of this scheme is illustrated both analytically and also through simulation results.
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Fernandopulle, Nilkamal Alden Robert T. H. Findlay Raymond D. Tang Chi-keung. "Improved dynamic security assessment for AC/DC power systems using transient energy functions." *McMaster only, 2005.

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9

Sarker, Partha Sarathi. "DYNAMIC MODELING, STABILITY ANALYSIS AND CONTROL OF AC/DC INTERCONNECTED MICROGRID USING DQ-TRANSFORMATION." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/518146.

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Анотація:
Electrical and Computer Engineering
M.S.E.E.
In recent years, there have been significant changes in power systems due to the integration of renewables, distributed generation, switched power loads, and energy storage systems, etc. Locally these AC/DC microgrids include both DC generation (such as solar PV) and AC generation (such as wind generation), various DC and AC loads, converters and inverters, and energy storage systems, such as storage batteries and supercapacitors. DC systems are often characterized as low inertia systems whereas AC generation and systems are usually high inertia and high time constant systems. As such, various components of the microgrid will have different temporal characteristics in case of disturbances, such as short circuit, load switchings, etc. which may lead to instability of the microgrid. This research develops the first principle model for coupling the AC and the DC subsystem of an integrated AC/DC microgrid utilizing the dq-framework. The developed model is highly nonlinear and captures the dynamic interaction between the AC and DC subsystems of the microgrid. Lyapunov stability is used to evaluate the stability of the complete system. Simulation results show that the AC and DC subsystems are tightly dynamically coupled so that any disturbance in one subsystem induces transients in the other subsystem. Induced transients due to pulse loads on the AC and DC subsystems clearly show that generator damper winding alone may not be enough to mitigate transients in the microgrid. Addition of prime mover and excitation system controllers for the generator improves the transients primarily on the AC subsystem. Thus, a battery storage with a charge/discharge controller was also added to the DC subsystem. Simulations of the AC/DC microgrid with all three controllers validate the smooth operation of the system for all types of disturbances. The proposed method can be extended in modeling microgrid with multiple generators and various types of loads.
Temple University--Theses
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Yu, Chang. "An investigation of subsynchronous oscillation of AC/DC power systems modeling and analysis /." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37151885.

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Книги з теми "AC/DC Security; Stability":

1

Meegahapola, Lasantha, Siqi Bu, and Mingchen Gu. Hybrid AC/DC Power Grids: Stability and Control Aspects. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06384-8.

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2

Rio, Javier Arturo Del. Analysis of the electric arc stability in AC and DC arc furnaces by using a basis transformed state space approach. Ottawa: National Library of Canada, 1990.

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3

Hofheinz, Wolfgang. Fault current monitoring in electrical installations: Foundations, applications and methods of measuring residual current in AC and DC systems with residual current monitors (RCMs) according to IEC 62020 and other international standards. Berlin: VDE Verlag GMBH, 2004.

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4

Meegahapola, Lasantha, Mingchen Gu, and Siqi Bu. Hybrid AC/DC Power Grids: Stability and Control Aspects. Springer International Publishing AG, 2022.

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Частини книг з теми "AC/DC Security; Stability":

1

Ma, Qinfeng, Xiaotong Xu, Mingshun Liu, Feng Wu, Guosong Wang, Xiancheng Ren, and Yong Zhang. "An Online Pre-decision Method for Security and Stability of Frequency and Voltage Emergency Regulation in AC/DC Power System." In Proceedings of 2020 International Top-Level Forum on Engineering Science and Technology Development Strategy and The 5th PURPLE MOUNTAIN FORUM (PMF2020), 374–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9746-6_30.

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2

Braitor, Andrei-Constantin. "Stability Analysis of Parallel-Operated Bidirectional AC/DC and DC/DC Converters." In Advanced Hierarchical Control and Stability Analysis of DC Microgrids, 91–122. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95415-4_6.

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3

Wang, Gaolin, Nannan Zhao, Guoqiang Zhang, and Dianguo Xu. "Impedance Model Based Stability Control." In Reduced DC-link Capacitance AC Motor Drives, 85–101. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8566-1_4.

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4

Meegahapola, Lasantha, Siqi Bu, and Mingchen Gu. "Rotor Angle Stability of Hybrid AC/DC Power Grids." In Power Systems, 89–129. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06384-8_4.

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5

Karpaga Priya, R., S. Kavitha, M. Malathi, P. Sinthia, and K. Suresh Kumar. "Single-Phase Bi-Directional AC/DC Converters for Fast DC Bus Voltage Controller." In Emerging Trends in Expert Applications and Security, 33–44. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1946-8_4.

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6

Meegahapola, Lasantha, Siqi Bu, and Mingchen Gu. "Frequency Stability and Control of Hybrid AC/DC Power Grids." In Power Systems, 161–88. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06384-8_6.

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7

Li, Yong, Mingmin Zhang, and Yijia Cao. "Voltage Regulation Strategy of DC Distribution Network Based on Distributed Energy Storage in AC/DC Microgrid." In Stability Analysis, Flexible Control and Optimal Operation of Microgrid, 41–63. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0753-3_3.

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8

Li, Yong, Mingmin Zhang, and Yijia Cao. "Inertial Support Control of AC/DC Microgrid Based on Distributed Generations." In Stability Analysis, Flexible Control and Optimal Operation of Microgrid, 117–40. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0753-3_6.

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9

Meegahapola, Lasantha, Siqi Bu, and Mingchen Gu. "Voltage Stability and Control Aspects of Hybrid AC/DC Power Grids." In Power Systems, 131–59. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-06384-8_5.

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10

Dinavahi, Venkata, and Ning Lin. "Parallel-in-Time EMT and Transient Stability Simulation of AC-DC Grids." In Parallel Dynamic and Transient Simulation of Large-Scale Power Systems, 313–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86782-9_7.

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Тези доповідей конференцій з теми "AC/DC Security; Stability":

1

Cui, Yong, Nan Feng, Yuyao Feng, Yinghui Yu, and Weihong Wang. "Evaluation of security and stability risk of AC/DC grid under extreme contingencies." In 2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2016. http://dx.doi.org/10.1109/appeec.2016.7779701.

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2

Hui, C., X. Sixuan, H. Xingning, Z. Wenjia, and Q. Wanchun. "Study on the evaluation index strategy for the security and stability of receiving power grids integrated with multi-terminal flexible direct-current transmission systems." In 18th International Conference on AC and DC Power Transmission (ACDC 2022). Institution of Engineering and Technology, 2022. http://dx.doi.org/10.1049/icp.2022.1273.

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3

Minglan Lin, Anurag K. Srivastava, and Noel N. Schulz. "Voltage stability assessment of AC/DC systems." In IEEE PES T&D 2010. IEEE, 2010. http://dx.doi.org/10.1109/tdc.2010.5484329.

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4

Eriksson, Robert. "Security analysis of interconnected AC/DC systems." In 2015 Australasian Universities Power Engineering Conference (AUPEC). IEEE, 2015. http://dx.doi.org/10.1109/aupec.2015.7324794.

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5

Folly, K. A., and J. K. Mukusuka. "Voltage Stability of AC-DC Interconnections As Affected by AC Line Length." In 2007 IEEE Power Tech. IEEE, 2007. http://dx.doi.org/10.1109/pct.2007.4538313.

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6

Páez, J. D., K. Shinoda, D. A. Gómez Acero, and F. Morel. "Increasing DC system stability thanks to energy control in MMC based DC-DC converters." In 19th International Conference on AC and DC Power Transmission (ACDC 2023). Institution of Engineering and Technology, 2023. http://dx.doi.org/10.1049/icp.2023.1330.

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7

Gao, Jing, Ming-Li Zhang, Yi-He Wang, Wen-Ying Shang, Kun Song, Zhen-Tao Han, Lu Qin, and Xiaofei Ruan. "Frequency Stability Analysis and Control of AC/DC System." In 2019 16th International Computer Conference on Wavelet Active Media Technology and Information Processing (ICCWAMTIP). IEEE, 2019. http://dx.doi.org/10.1109/iccwamtip47768.2019.9067566.

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8

Shen, L., J. V. Milanović, W. Wang, and M. Barnes. "Integrated AC/DC model for power system stability studies." In 11th IET International Conference on AC and DC Power Transmission. Institution of Engineering and Technology, 2015. http://dx.doi.org/10.1049/cp.2015.0097.

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9

Czumbil, Levente, Denisa Stet, Andrei Ceclan, Laura Darabant, Mihaela Cretu, and Dan Micu. "Numerical Stability Studies for AC and DC Electrical Circuits." In 2018 53rd International Universities Power Engineering Conference (UPEC). IEEE, 2018. http://dx.doi.org/10.1109/upec.2018.8541993.

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10

Abedrabbo, M., M. Wang, P. Tielens, F. Z. Dejene, W. Leterme, J. Beerten, and D. Van Hertem. "Impact of DC grid contingencies on AC system stability." In 13th IET International Conference on AC and DC Power Transmission (ACDC 2017). Institution of Engineering and Technology, 2017. http://dx.doi.org/10.1049/cp.2017.0025.

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