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Academic literature on the topic 'Voltage stability limit'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Voltage stability limit"

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Anichebe, I. B., and A. O. Ekwue. "Improvement of bus voltage profiles of Nigerian power network in the presence of Static Synchronous Compensator (STATCOM) and Doubly Fed Induction Generator (DFIG)." Nigerian Journal of Technology 39, no. 1 (April 3, 2020): 228–37. http://dx.doi.org/10.4314/njt.v39i1.26.

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Frequent blackouts and unstable supply of electricity show that the voltage instability problem has been one of the major challenges facing the power system network in Nigeria. This study investigates the voltage stability analysis of the Nigerian power network in the presence of renewable energy sources; FACTS device is used as a voltage controller. A 330kV, 28-bus power system network was studied using the PSS/E software-based Newton-Raphson load-flow technique. The results show that 10 out of the 28 buses had voltages lying below the statutory limit of 0.95 ≤ 1.05 p.u. The application of STATCOM and DFIG devices on two of the weakest buses restored the voltages to acceptable statutory limits. The total active and reactive power losses were reduced to 18.76% and 18.82% respectively. Keywords: Voltage stability analysis; Integration of renewable energy sources; FACTS controllers, Reactive Power, Power Flow.
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Sundaravazhuthi*, V., Dr A. Alli Rani, and M. Manoj Kumar. "Raise Voltage Stability Limit of a Power System using Reactive Power Compensation Technique." International Journal of Innovative Technology and Exploring Engineering 8, no. 12 (October 30, 2019): 2931–34. http://dx.doi.org/10.35940/ijitee.k1752.1081219.

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In recent years, voltage stability problems have been increasing since power systems operate close to stability limits. The voltage stability problem of a power system is associated with a rapid voltage drop due to heavy system load and it occurs because of inadequate reactive power support at some critical bus. One of the serious consequences of the voltage stability is a system blackout, and this has received more attention in recent years. Accurate determination of stability limit and amount of reactive power injection to stabilize is important.This paper proposes to determine voltage stability margin of a critical bus and also provide amount of reactive power injection to the bus particularly during overload, a simple two bus equivalent model of the power system is used to determine the maximum apparent power for different power factors. Any required apparent power can directly obtained by correcting the reactive power at critical bus. Experimental results support our theoretical findings.
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Toyoda, Junichi, Be-fei Fang, and Hiroumi Saitoh. "Bifurcation of Voltage Stability Limit in Direct Computational Approach." IEEJ Transactions on Power and Energy 115, no. 6 (1995): 576–81. http://dx.doi.org/10.1541/ieejpes1990.115.6_576.

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Obadina, O. O., and G. J. Berg. "Determination of voltage stability limit in multimachine power systems." IEEE Transactions on Power Systems 3, no. 4 (1988): 1545–54. http://dx.doi.org/10.1109/59.192964.

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Liu, Bing, Ying Wang, Zhen Yang, Yun Wei Li, Hua Zhi Xie, Yan Zhang, Wen Chao Zhang, Xiang Yang Deng, and Cheng Ming He. "Evaluation Method of Voltage Stability Based on Minimum Singular Value." Applied Mechanics and Materials 511-512 (February 2014): 1128–32. http://dx.doi.org/10.4028/www.scientific.net/amm.511-512.1128.

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When the system reaches the static voltage stability limit point, Jacobian matrix is singular. By checking if minimum singular value is zero, its very easy to determine whether or not Jacobian matrix is singular. So the minimum singular value of Jacobian matrix can reflects the degree of system voltage stability effectively. Firstly this paper introduces singular value decomposition, analyses load characteristic and excitation limits involved in this method and examples on PSD-FDS are demonstrated. At last, suggestion on voltage stability monitoring by minimum singular value is proposed.
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Saeed, Wafaa, and Layth Tawfeeq. "Voltage Collapse Optimization for the Iraqi Extra High Voltage 400 kV Grid based on Particle Swarm Optimization." Iraqi Journal for Electrical and Electronic Engineering 13, no. 1 (June 1, 2017): 17–31. http://dx.doi.org/10.37917/ijeee.13.1.3.

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The continuously ever-growing demand for the electrical power causing the continuous expansion and complexity of power systems, environmental and economic factors forcing the system to work near the critical limits of stability, so research's stability have become research areas worthy of attention in the resent day. The present work includes two phases: The first one is to determine the Voltage Stability Index for the more insensitive load bus to the voltage collapse in an interconnected power system using fast analyzed method based on separate voltage and current for PQ buses from these of PV buses, while the second phase is to suggested a simulated optimization technique for optimal voltage stability profile all around the power system. The optimization technique is used to adjust the control variables elements: Generator voltage magnitude, active power of PV buses, VAR of shunt capacitor banks and the position of transformers tap with satisfied the limit of the state variables (load voltages, generator reactive power and the active power of the slack bus). These control variables are main effect on the voltage stability profile to reach the peak prospect voltage stable loading with acceptable voltage profile. An optimized voltage collapse based on Particle Swarm Optimization has been tested on both of the IEEE 6 bus system and the Iraqi Extra High Voltage 400 kV Grid 28 bus. To ensure the effectiveness of the optimization technique a comparison between the stability indexes for load buses before and after technical application are presented. Simulation results have been executed using Matlab software.
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Kumar, Praveen. "Alternative Criteria of Voltage Stability Margin for the Purpose of Load Shedding." International Journal for Research in Applied Science and Engineering Technology 9, no. 10 (October 31, 2021): 201–6. http://dx.doi.org/10.22214/ijraset.2021.38194.

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Abstract: Voltage instability takes on the form of a dramatic drop of transmission system voltages, which may lead to system disruption. During the past two decades it has become a major threat for the operation of many systems and, in the prevailing open access environment, it is a factor leading to limit power transfers. The objective of this paper is to present new method of under voltage protection with maximum utilization of system capabilities.
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Ezeruigbo, E. N., A. O. Ekwue, and L. U. Anih. "Voltage Stability Analysis of Nigerian 330kV Power Grid using Static P-V Plots." Nigerian Journal of Technology 40, no. 1 (March 23, 2021): 70–80. http://dx.doi.org/10.4314/njt.v40i1.11.

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Nigeria power system has been experiencing total or partial system failures in recent times and voltage instability is a strong factor. The paper seeks to perform the voltage stability analysis, based on static P-V plots, on buses located around and within the South East zone of Nigeria. An injection group containing generators to serve as the source and a sink group as loads to be monitored are created. The generators are assumed to be within their min/max MW limits. The load is increased in the sink group as well as in the source group to maintain the same generation/load balance. Load power and bus voltages (P-V) curves are plotted on the load busbars and the first busbar to reach the voltage collapse and MW transfer limit are determined. From the results obtained, at a load of 100 MW, Makurdi bus recorded a voltage of 0.9301 pu which is already below the regulatory standards of ±5% of the nominal line voltage. It entered the region of instability at a load of 245 MW. This created a situation of system instability and a possible partial system collapse. Subsequently, at a load of 260 MW, the system clearly entered unstable region giving rise to partial system collapse of the network.
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Xing, Da Peng, Jia Li, and Da Qiang Qiu. "A New Estimation Method of Transient Voltage Stability Limit Clearing Time." Advanced Materials Research 971-973 (June 2014): 1051–54. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.1051.

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Critical clearing time index is one of the indices to assess transient voltage stability. At present it is mainly calculated based on the instantaneous value after transient voltage instability or the steady state valueafer fault clearing time. So a new method to estimate the critical clearing time is presented which is correspongding to the induction motor minimum slipvalue in the fault. It can forecasttransient voltage instability,and has higher precision comparing whithquik criterion and analytical method. The simulation results of IEEE 30-bus system verify the effectiveness of the stated method. .CLC number: TM 73 Document code: A Article ID: 000-3673(2013)00-0000-00
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Wondie, Tebeje Tesfaw, and Teshome Goa Tella. "Voltage Stability Assessments and Their Improvement Using Optimal Placed Static Synchronous Compensator (STATCOM)." Journal of Electrical and Computer Engineering 2022 (August 23, 2022): 1–12. http://dx.doi.org/10.1155/2022/2071454.

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In this paper, static voltage stability assessments and their improvement using analytical and optimization techniques with different loading scenarios are described. In this study, the 400 kV, 230 kV, and 132 kV Ethiopian electric power networks are modeled using Power System Analysis Toolbox (PSAT), and the load flow analysis is carried out using MATLAB source code. Then, different voltage stability indices, such as the user-defined advanced voltage stability index (AVSI), modified voltage stability index (MVSI), and fast voltage stability index (FVSI), are used to identify the voltage unstable buses. Besides this, particle swarm optimization (PSO) is also used to find the optimal size and placement of the Static Synchronous Compensator (STATCOM) for the most severe buses identified by voltage stability indices. The result presents three special arguments: whether the most severe buses that are ranked at the top based on the voltage stability indices are optimal buses for compensation placement or not, the voltage stability improvement, and power loss reduction with the introduction of STATCOM. Accordingly, it is observed that the weakest bus that is identified through the stability indices may not be the optimal placement of the compensation device. It is also indicated that, with the introduction of STATCOM to the optimal selected bus, the network power loss is reduced from 46.65 MW to 33.32 MW and its voltage magnitude in all buses is also improved. All bus voltages are within the IEEE standard acceptable limit.
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Dissertations / Theses on the topic "Voltage stability limit"

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Zhu, Pengcheng. "A novel Q-limit guided continuation power flow method for voltage stability analysis." Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5360.

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Voltage security assessment is becoming a more and more important issue due to the fact that electrical power systems are more prone to voltage instability under increased demand, and it can be time-consuming to determine the actual level of voltage security in large power systems. For this reason, this thesis presents a novel method for calculating the margin of voltage collapse that is based on the Continuation Power Flow (CPF) method. The method offers a flexible and reliable solution procedure without suffering from divergence problems even when near the bifurcation point. In addition, the new method accounts for reactive power limits. The algorithmic continuation steps are guided by the prediction of Q-limit breaking point. A Lagrange polynomial interpolation formula is used in this method in order to find the Q-limit breaking point indices that determine when the reactive power output of a generator has reached its limit. The algorithmic continuation steps will then be guided to the closest Q-limit breaking point, consequently reducing the number of continuation steps and saving computational time. The novel method is compared with alternative conventional and enhanced CPF methods. In order to improve CPF further, studies comparing the performance of using direct and iterative solvers in a power flow calculation have also been performed. I first attempt to employ the column approximate minimum degree (AMD) ordering scheme to reset the permutation of the coefficient matrix, which decreases the number of iterations required by iterative solvers. Finally, the novel method has been applied to a range of power system case studies including a 953 bus national grid transmission case study. The results are discussed in detail and compared against exiting CPF methods.
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Abrantes, Adriano Lima. "Bifurcações induzidas por limites no contexto de estabilidade de tensão." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-31082016-113911/.

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A interligação dos sistemas elétricos de potência (SEPs) resultou em um aumento na complexidade dos mesmos. Além disso, devido a pressões econômicas e ambientais, os sistemas têm operado mais próximos aos seus limites de transmissão, o que aumenta a relevância de análises de segurança no contexto de estabilidade de tensão. Neste cenário, problemas associados à capacidade de transmissão do SEP, como a bifurcação induzida por limite (BIL), tornam-se mais importantes, criando a necessidade de ferramentas de análise apropriadas. Um dos objetivos deste projeto de mestrado é estudar mais profundamente as BILs para que se possa tratar melhor o fenômeno no contexto de estabilidade de tensão. Outro objetivo é o desenvolvimento de técnicas para avaliação da margem de estabilidade de tensão (MET) considerando a possibilidade de ocorrência de BIL. Finalmente, dada a grande importância e ampla utilização da análise de sensibilidade da MET devido à bifurcação sela-nó (BSN) em estudos de estabilidade de tensão, o equacionamento do problema de análise de sensibilidade da MET devido à BIL é o terceiro objetivo deste trabalho. A análise de sensibilidade é importante pois, não só fornece mais informações sobre o fenômeno de instabilidade e seus mecanismos, mas também auxilia na análise de segurança de SEPs, fornecendo informações sobre quais ações de controle serão mais eficazes na manutenção da MET e quais contingências serão mais severas. Isto é, quais mudanças no sistema mais afetam a MET. No entanto, este tipo de análise só foi realizado para o caso em que a MET é determinada por um ponto de BSN, não para o caso da BIL. Com o intuito de possibilitar que ferramentas de seleção de controles preventivos tratem o fenômeno da BIL, realizou-se uma análise de sensibilidade do ponto de BIL similar à análise usual baseada na BSN. Outra contribuição deste trabalho é uma formulação suave de limites complementares que foi aplicada ao problema de limites de injeção de potência reativa de unidades geradoras. A formulação proposta transforma, pelo menos numericamente, a BIL em uma BSN que pode ser detectada através de métodos já consolidados na literatura.
The interconnection of electric power systems (EPSs) led to an increase in security assessment complexity. Besides, due to economical and environmental inuences, EPSs have been operating closer to their transmission limits, which raises the relevance of security assessment in the context of voltage stability. In this scenario, problems related to EPS power transmission capacity, such as the limit induced bifurcation (LIB), become more important and bring the need of appropriate analysis tools. One of the goals of this project is to study the LIB problem more deeply, so it can be better understood in the context of voltage stability. Another objective is the development of methods for evaluating the load margin (LM) considering the possible occurrence of LIBs. Finally, since the LM sensitivity analysis due to saddle-node bifurcation (SNB) plays a highly important role in voltage stability studies, developing a method for LM sensitivity analysis due to LIB is our third objective. The sensitivity analysis is important not only because it provides information on the instability phenomenon and its mechanisms, but it is also useful for EPS security assessment, since it may provide knowledge on which control actions will be more eective in increasing the LM and which contingencies may be more severe. However, this analysis has been performed only for the case in which the LM is determined by a SNB point, not for the LIB case. With the intention of enabling pre-existing preventive control selection tools to treat the LIB phenomenon, a sensitivity analysis was performed at the LIB point similarly to what was developed for the SNB. Another contribution of this work is a smoothing formulation for complementary limits that was applied to the problem of limited reactive power injection of generating units. The proposed formulation transforms, at least numerically, the LIB in a SNB, which may be detected through methods already established in literature.
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Tamimi, Ala. "Voltage stability limits for weak power systems with high wind penetration." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13100.

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Doctor of Philosophy
Department of Electrical and Computer Engineering
Anil Pahwa
Shelli K. Starrett
Analysis of power system voltage stability has practical value in increasing wind penetration levels. As wind penetration levels increase in power systems, voltage stability challenges arise due to locating wind resources far away from load centers. This dissertation presents several different voltage stability methods for sizing new wind farms. Power system wind penetration levels depend on the available voltage stability margins (VSMs) of the existing power system and system load characteristics. Three new iterative methods have been developed to maximize wind penetration level in weak power systems based on systems’ VSMs. The first two methods use an iterative approach for increasing the size of each wind farm until reaching the collapse point. Wind farms with less negative impact on system VSMs are sized larger than others. A third wind farm sizing method has been developed using modal analysis in conjunction with the traditional voltage stability method (Q-V method). Wind farms are placed at buses in the power system which have the lowest negative impact on voltage instability modes (strong wind injection buses). By placing the wind farms at the strongest wind injection buses, higher amounts of wind power can be injected into the power system. To further increase wind penetration in weak power systems, two additional techniques are introduced and applied to the western Kansas power system. The first technique uses modes of voltage instability to place voltage support equipment like static var compensators at locations in the power system where they provide the needed reactive power support for increasing levels of wind penetration. The second technique uses the fact that wind patterns at a wind farm site may rarely allow the wind farm to produce its maximum capacity during the peak loading hours. Wind farm maximum sizes can be increased above their maximum voltage stable size limit without driving the power system into becoming voltage unstable. Preventing voltage collapse for the additional increases in wind farm sizes is accomplished by disconnecting some wind turbines inside the wind farm during critical times to reduce its power output to a voltage stable level.
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Wang, Wei-Ming, and 王瑋民. "Analysis of Voltage Stability Limit for Radial Distribution Systems." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/68754059370236313483.

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博士
國立成功大學
電機工程研究所
84
In this dissertation, the steady-state small dis -turbance voltage stability limit for a radial distribution system is thoroughly analyzed. The solutions for radial distribution systems. By this method, an equivalent 2-bus network can be obtained during the solving process. Based on the 2-bus network, the steady-state load limit and voltage stability limit are investigated. The circle diagrams and Jacobian determinant are developed first to derive the load limit and voltage stability limit for radial distribution systems. For the purpose of checking the limits equations derived by the authors, the well-known L stability indicator is adopted for the task of justification. The consistency among these methods is shown. It is shown that the positive Jacobian determinant corresponds to an L indicator less than 1 which meets the voltage stability criterion. To show the effects of load models on the voltage stability limit, a composite load model composed of a part of constant power load, a part of constant impedance load and a part of constant current load is adopted to derive the general equation of voltage stability limit. It is found that the voltage stability problems are mostly caused by the constant power load. In the literature, almost all the tasks of proving the uniqueness of a voltage solution for a radial distribution system are based on a 2-bus system. In this dissertation, the authors derive a general equation of the [dV/dP] of load bus, and by checking the sign of [dV/dP] of each load bus, the uniqueness of a voltage solution can be shown. The method of proof developed is more general than those methods published.
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Shieh, Jeng-Cheng, and 謝正誠. "The Study and Improvement of Voltage Stability with the Limit of Power Transmission." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/38340033520241485104.

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碩士
國立臺北科技大學
機電整合研究所
87
Taiwan power system in the peak-load period has a large amount of power flow through 345kV-transmission lines from the central and southern areas to northern area. In this time, if one of these lines is tripped, the voltage stability of the power system would be affected. Hence, how to prevent voltage collapse and compensate the reactive power of a power system become very important. In the past, most of researches in the field of voltage stability used uniform rate to deal with the system load increase. In this paper, we analyze the power system stability, focusing on the limit of transmission line power flow between two areas. This paper uses PSS/E, IPLAN and OPF analysis package to develop a helpful method to generate P-V curves for Taiwan power system voltage stability analysis. Using these P-V curves, it is easy to identify the saddle-node bifurcation point and to determine the weak bus index and real power transmission limit from the central area to northern area. Besides, in normal operating condition, some line outage cases with 345kV-interface line from central area to northern area and some generator outage cases of the voltage stability of Taiwan power system were studied. Finally, the optimal compensation of the parallel capacitors and series capacitors to improve the voltage stability of the system were proposed in this paper.
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Jeng, Jyh-Cheng, and 鄭至成. "Analysis of Steady-State Voltage Stability Limit of Radial Distribution Systems Considering Load Characteristics." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/92724972776797425270.

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碩士
國立成功大學
電機工程研究所
83
Analysis of voltage stability limit is an important topic in the study of a distribution system. In this thesis, the effects of different types of static loads is investigated on the steady-state voltage stability limit for a radial distribution system. The loads adopted in the investigation include constant power loads, constant impedance loads and constant current loads. Furthermore, the uniqueness and existence of the voltage solution are discussed. In solving the load flow problems of the radial power network, the DistFlow technique has been proposed as the most suitable method. In this method, an equivalent two-bus network will be obtained simultaneously. Based on that, the analysis in this thesis is mainly concentrated on the two-bus system. The detailed simulated results are presented to justify the opinions proposed.The result reveal that when a larger part of constant current or constant impedance load is added to the total load, the voltage stability limit will move far into the lower branch of the P-V curve and multiple load flow solutions may exist.
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Sarnari, Alberto Jose. "Numerically Robust Load Flow Techniques in Power System Planning." Thesis, 2019. http://hdl.handle.net/2440/119928.

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Since deregulation of the electric power industry, investment in the sector has not kept up with demand. State grids were interconnected to form vast power networks, which increased the overall system’s complexity. Conventional generation sources have, in some cases, closed under financial stress caused by the growing penetration of renewable sources and unfavourable government measures. The power system must adapt to a more demanding environment to that for which it was conceived. This thesis investigates the robustness of planning and simulation study tools for the determination of bus-voltages and voltage stability limits. It also provides an approach to obtain greater certainty in the determination of voltages where conventional methods fail to be deterministic. Two complementary methods for determining the collapse voltage are developed in this thesis. The first method applies Robust Padé approximations to the holomorphic embedding load flow method; while the second method uses the Newton-Raphson numerical calculation method to obtain both high and low voltage solution branches, and voltage stability limits of power system load buses. The proposed methods have been implemented using MATLAB and been demonstrated through a number of IEEE power system test cases. The robust Padé approximation algorithm improves the reliability of solutions of load flow problems when bus-voltages are presented in Taylor series form by converting the series into optimised rational functions. Differences between the classic Padé approximation algorithm and the new robust version, which is based on singular value decomposition (SVD), are described. The new robust approximation method can determine an optimal rational function approximation using the coefficients of a Taylor series expansion. Consequently, the voltage collapse points, as well as the steady-state voltage stability margin, can be calculated with high reliability. Voltage collapse points (i.e. branching points) are identified by using the locations of poles/zeros of a rational function approximation. Numerical examples are devised to illustrate potential use of the proposed method in practical applications. Use of the Newton-Raphson method, combined with the discrete Fourier transform and robust Padé approximation, enables the calculation of the voltage stability limits and both the high and low voltage solution branches for the load buses of a power system. This can work to a great advantage of existing N-R based software users, as problems of initial guess, multiple solutions and Jacobian matrix conditioning when operating close to the voltage collapse point are avoided. The findings are assessed by comparisons with conventional Newton-Raphson, the holomorphic embedding load flow method, and continuation power flow method. This thesis contains a combination of conventional and publication formats, where some introductory materials are included to ensure that the thesis delivers a consistent narrative. For this reason, the first two chapters provide the required background information, research gap identification and contributions, whilst other chapters are written to provide more detailed work that has not yet been published or to summarise the research outcomes and future research directions. Furthermore, publications are listed in their publication formats, complete with statements of the authors’ contributions.
Thesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2019
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Avalos, Munoz Jose Rafael. "Analysis and Application of Optimization Techniques to Power System Security and Electricity Markets." Thesis, 2008. http://hdl.handle.net/10012/3692.

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Determining the maximum power system loadability, as well as preventing the system from being operated close to the stability limits is very important in power systems planning and operation. The application of optimization techniques to power systems security and electricity markets is a rather relevant research area in power engineering. The study of optimization models to determine critical operating conditions of a power system to obtain secure power dispatches in an electricity market has gained particular attention. This thesis studies and develops optimization models and techniques to detect or avoid voltage instability points in a power system in the context of a competitive electricity market. A thorough analysis of an optimization model to determine the maximum power loadability points is first presented, demonstrating that a solution of this model corresponds to either Saddle-node Bifurcation (SNB) or Limit-induced Bifurcation (LIB) points of a power flow model. The analysis consists of showing that the transversality conditions that characterize these bifurcations can be derived from the optimality conditions at the solution of the optimization model. The study also includes a numerical comparison between the optimization and a continuation power flow method to show that these techniques converge to the same maximum loading point. It is shown that the optimization method is a very versatile technique to determine the maximum loading point, since it can be readily implemented and solved. Furthermore, this model is very flexible, as it can be reformulated to optimize different system parameters so that the loading margin is maximized. The Optimal Power Flow (OPF) problem with voltage stability (VS) constraints is a highly nonlinear optimization problem which demands robust and efficient solution techniques. Furthermore, the proper formulation of the VS constraints plays a significant role not only from the practical point of view, but also from the market/system perspective. Thus, a novel and practical OPF-based auction model is proposed that includes a VS constraint based on the singular value decomposition (SVD) of the power flow Jacobian. The newly developed model is tested using realistic systems of up to 1211 buses to demonstrate its practical application. The results show that the proposed model better represents power system security in the OPF and yields better market signals. Furthermore, the corresponding solution technique outperforms previous approaches for the same problem. Other solution techniques for this OPF problem are also investigated. One makes use of a cutting planes (CP) technique to handle the VS constraint using a primal-dual Interior-point Method (IPM) scheme. Another tries to reformulate the OPF and VS constraint as a semidefinite programming (SDP) problem, since SDP has proven to work well for certain power system optimization problems; however, it is demonstrated that this technique cannot be used to solve this particular optimization problem.
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Le, Ha Thu. "Increasing wind power penetration and voltage stability limits using energy storage systems." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-864.

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The research is motivated by the need to address two major challenges in wind power integration: how to mitigate wind power fluctuation and how to ensure stability of the farm and host grid. It is envisaged that wind farm power output fluctuation can be reduced by using a specific type of buffer, such as an energy storage system (ESS), to absorb its negative impact. The proposed solution, therefore, employs ESS to solve the problems. The key research findings include a new technique for calculating the desired power output profile, an ESS charge-discharge scheme, a novel direct-calculation (optimization-based) method for determining ESS optimal rating, and an ESS operation scheme for improving wind farm transient stability. Analysis with 14 wind farms and a compressed-air energy storage system (CAES) shows that the charge-discharge scheme and the desired output calculation technique are appropriate for ESS operation. The optimal ESSs for the 14 wind farms perform four or less switching operations daily (73.2%-85.5% of the 365 days) while regulating the farms output variation. On average, the ESSs carry out 2.5 to 3.1 switching operations per day. By using the direct-calculation method, an optimal ESS rating can be found for any wind farm with a high degree of accuracy. The method has a considerable advantage over traditional differential-based methods because it does not require knowledge of the analytical form of the objective function. For ESSs optimal rating, the improvement in wind energy integration is between 1.7% and 8%. In addition, a net increase in grid steady-state voltage stability of 8.3%-18.3% is achieved by 13 of the 14 evaluated ESSs. For improving wind farm transient stability, the proposed ESS operation scheme is effective. It exploits the use of a synchronous-machine-based ESS as a synchronous condenser to dynamically supply a wind farm with reactive power during faults. Analysis with an ESS and a 60-MW wind farm consisting of stall-regulated wind turbines shows that the ESS increases the farm critical clearing time (CCT) by 1 cycle for worst-case bolted three-phase-to-ground faults. For bolted single-phase-to-ground faults, the CCT is improved by 23.1%-52.2%.
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Lu, Liming. "Immediate change in stability and voltage collapse when power system limits are encountered." 1991. http://catalog.hathitrust.org/api/volumes/oclc/24350837.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1991.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 34-37).
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Book chapters on the topic "Voltage stability limit"

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Behera, Santi, and Manish Tripathy. "Optimal Reactive Power Compensation for Improvement of Steady State Voltage Stability Limit under Stressed System Condition Using BF Algorithm." In Swarm, Evolutionary, and Memetic Computing, 388–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35380-2_46.

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"Degradation of NanoDielectrics." In Design and Investment of High Voltage NanoDielectrics, 323–60. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-3829-6.ch010.

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Type and concentration of nanoparticles inside polymers can help or limit the chain portability and lead to diminishing or expanding electric encasing on connect or cutoff for versatile accuse and the development of charge transporters, especially polymer dielectrics. This chapter sheds light on the degradation of nanodielectrics which handled the electrical degradation and lifetime. The chapter contains also the different nanodielectrics thin films and presents the effect of degradation of nanodielectrics under AC and DC electric fields. It contains details about thermal stability analysis. Finally, this chapter draws attention on the recommendation for investment nanodielectrics technologies.
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Wang, Wei, Haiyun Wang, Qian Chen, Huayue Wei, and Jianfang Zhang. "AVC Fine Control Rules of Urban Power Grid Based on Improved Deep Probabilistic Neural Network." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde221212.

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Aiming at the problems that the voltage of urban power system is greatly affected by load and the control is complex, this paper proposes a fine control rule of AVC (Automatic Voltage Control) based on improved deep probabilistic neural network. The rule is based on a variety of power grid operation modes, and different control variables are extracted to form state variables. The deep probabilistic neural network algorithm is used to study the internal relationship between control variables and state variables. At the same time, the genetic algorithm is used to optimize the AVC limit parameters, and the AVC fine control rules are obtained. Compared with the traditional AVC control rules based on linear regression model, the deep probabilistic neural network combined with genetic algorithm model proposed in this paper has smaller error, stronger robustness and effective solution to the nonlinear problem of urban power grid data for AVC limit parameter optimization, it can effectively improve the power factor of the system, ensure the safety of the system and improve the stability of the system.
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Rawat, Mahiraj Singh, and Shelly Vadhera. "Voltage Stability Assessment Techniques for Modern Power Systems." In Advances in Environmental Engineering and Green Technologies, 128–76. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-8551-0.ch006.

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In recent times, most of the power systems are made to operate close to their operating limits owing to various reasons like slow pace of transmission line expansion, environmental constraints, deregulated electricity market, etc. Therefore, the issue of maintaining the system stability has become the primary objective of the utility companies. The recent development and integration of renewable energy sources have further pushed the modern power systems to system security risks. The voltage instability had been the major cause of recent blackouts around the world. The timely assessment of voltage stability can prevent the blackouts in the power systems. This chapter explores the classical as well as newly developed static voltage stability assessment techniques proposed by various researchers in recent years. Also, the chapter cater to the needs of undergraduate as well as graduate students, professional engineers, and researchers who all are working in the domain of power system voltage stability.
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Jabari, Farkhondeh, Heresh Seyedia, Sajad Najafi Ravadanegh, and Behnam Mohammadi Ivatloo. "Stochastic Contingency Analysis Based on Voltage Stability Assessment in Islanded Power System Considering Load Uncertainty Using MCS and k-PEM." In Advances in Computer and Electrical Engineering, 12–36. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-4666-9911-3.ch002.

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Increased electricity demands and economic operation of large power systems in a deregulated environment with a limited investment in transmission expansion planning causes interconnected power grids to be operated closer to their stability limits. Meanwhile, the loads uncertainty will affect the static and dynamic stabilities. Therefore, if there is no emergency corrective control in time, occurrence of wide area contingency may lead to the catastrophic cascading outages. Studies show that many wide area blackouts which led to massive economic losses may have been prevented by a fast feasible controlled islanding decision making. This chapter introduces a novel computationally efficient approach for separating of bulk power system into several stable sections following a severe disturbance. The splitting strategy reduces the large initial search space to an interface boundary network considering coherency of synchronous generators and network graph simplification. Then, a novel islanding scenario generator algorithm denoted as BEM (Backward Elimination Method) based on PMEAs (Primary Maximum Expansion Areas) has been applied to generate all proper islanding solutions in the simplified network graph. The PPF (Probabilistic Power Flow) based on Newton-Raphson method and Q-V modal analysis has been used to evaluate the steady-state stability of created islands in each generated scenario. BICA (Binary Imperialistic Competitive Algorithm) has then been applied to minimize total load-generation mismatch considering integrity, voltage permitted range and steady-state voltage stability constraints. The best solution has then been applied to split the entire power network. A novel stochastic contingency analysis of islands based on PSVI (Probability of Static Voltage Instability) using MCS (Monte Carlo Simulation) and k-PEM (k-Point Estimate Method) have been proposed to identify the critical PQ buses and severe contingencies. In these approaches, the ITM (Inverse Transform Method) has been used to model uncertain loads with normal probability distribution function in optimal islanded power system. The robustness, effectiveness and capability of the proposed approaches have been validated on the New England 39-bus standard power system.
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Made Wartana, I., and Ni Putu Agustini. "Optimal Integration of Series and Shunt FACTS with Wind Energy for Active Power Loss Reduction." In Renewable Energy - Recent Advances [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107296.

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The integration of wind energy (WE) with flexible AC transmission system (FACTS) devices into the grid to improve grid performance is one of the latest advances in renewable energy (RE) technology. This work proposes the optimal placement and size of a WE, a doubly-fed induction generator (DFIG) with two of FACTS controller, viz. thyristor-controlled series compensator (TCSC) static var compensator (SVC). The goal is to maximize system bus load (Max. LBS) and minimize active power loss (Min. Ploss) by satisfying various safety and stability constraints. Newton Raphson\'s power flow study involving TCSC, SVC, and DFIG is a bi-objective that meets multiple constraints: lines, generation, voltage limits, and small signal stability. A variant of the genetic algorithm, non-dominated sorting GA II (NSGA-II), was applied to solve the contradictory bi-objective optimization problem. A modified standard and practical test system, the IEEE 14-bus and the Indonesia Java Bali 24-bus, integrated with DFIG, TCSC, and SVC, were simulated to investigate the efficacy of the suggested technique. The simulation shows that the optimal placement and size of DFIG with both FACTS can improve system performance with all system loading conditions and meet all system constraints.
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Conference papers on the topic "Voltage stability limit"

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Li Peng, Yuan Yubo, and Wang Yuting. "On-line voltage stability assessment strategy considering limit of voltage source." In TENCON 2015 - 2015 IEEE Region 10 Conference. IEEE, 2015. http://dx.doi.org/10.1109/tencon.2015.7372873.

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Duan, Jundong, and Shanshan Zhu. "The Effect of OLTC on Static Voltage Stability Limit." In 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5749167.

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Ramalingam, K., and C. S. Indulkar. "Determination of Steady State Voltage Stability limit using PQ curves for voltage sensitive loads." In 2008 Joint International Conference on Power System Technology and IEEE Power India Conference (POWERCON). IEEE, 2008. http://dx.doi.org/10.1109/icpst.2008.4745152.

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Shixiong, Fan, Han Wei, Li Lixin, Wang Wei, Zhang Peng, Fu Jiayu, Hu Yiping, and Xu Guorui. "Influence of synchronous condenser exciter limit on voltage stability of HVDC." In 2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2018. http://dx.doi.org/10.1109/iciea.2018.8397716.

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Zhao, X. Y., and X. B. Zhang. "Smoothness of voltage stability surface with generator reactive power limit encountered." In 2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies. IEEE, 2008. http://dx.doi.org/10.1109/drpt.2008.4523479.

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Dan, Yao, and Zhong Hao. "A fast method of voltage stability margin load for limit induced bifurcation." In 2013 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2013. http://dx.doi.org/10.1109/appeec.2013.6837316.

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Sarnari, Alberto Jose, and Rastko Zivanovic. "Reliable steady state voltage stability limit estimation using Newton-Raphson-based method." In 2017 Australasian Universities Power Engineering Conference (AUPEC). IEEE, 2017. http://dx.doi.org/10.1109/aupec.2017.8282450.

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Hao Wu and C. W. Yu. "An algorithm for point of collapse method to compute voltage stability limit." In 2004 IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies. Proceedings. IEEE, 2004. http://dx.doi.org/10.1109/drpt.2004.1338476.

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Yu, Xiaodan, Shucun Cao, Hongjie Jia, and Pei Zhang. "Impact of the Exciter Voltage Limit to Power System Small Signal Stability Region." In 2007 IEEE Power Engineering Society General Meeting. IEEE, 2007. http://dx.doi.org/10.1109/pes.2007.385694.

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Lan, Zhou, Xiaofei Wang, Mingjiu Pan, Kai Yang, Yuntian Lou, and Ke Sun. "Research on Voltage Stability and Control of DFIG Based on Power Limit Trajectory." In 2022 IEEE 5th International Electrical and Energy Conference (CIEEC). IEEE, 2022. http://dx.doi.org/10.1109/cieec54735.2022.9846705.

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