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Power-flow study

About: Power-flow study is a research topic. Over the lifetime, 8091 publications have been published within this topic receiving 155053 citations. The topic is also known as: load-flow study.


Papers
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Journal ArticleDOI
TL;DR: A novel feasible point pursuit (FPP)-based SE solver, which iteratively seeks feasible solutions for a nonconvex quadratically constrained quadratic programming reformulation of the weighted least-squares (WLS) SE problem.
Abstract: Accurately monitoring the system's operating point is central to the reliable and economic operation of an autonomous energy grid. Power system state estimation (PSSE) aims to obtain complete voltage magnitude and angle information at each bus given a number of system variables at selected buses and lines. Power flow analysis amounts to solving a set of noise-free power flow equations, and is cast as a special case of PSSE. Physical laws dictate quadratic relationships between available quantities and unknown voltages, rendering general instances of power flow and PSSE nonconvex and NP-hard. Past approaches are largely based on gradient-type iterative procedures or semidefinite relaxation (SDR). Due to nonconvexity, the solution obtained via gradient-type schemes depends on initialization, while SDR methods do not perform as desired in challenging scenarios. This paper puts forth novel feasible point pursuit (FPP)-based solvers for power flow analysis and PSSE, which iteratively seek feasible solutions for a nonconvex quadratically constrained quadratic programming reformulation of the weighted least-squares (WLS). Relative to the prior art, the developed solvers offer superior numerical performance at the cost of higher computational complexity. Furthermore, they converge to a stationary point of the WLS problem. As a baseline for comparing different estimators, the Cramer-Rao lower bound is derived for the fundamental PSSE problem in this paper. Judicious numerical tests on several IEEE benchmark systems showcase markedly improved performance of our FPP-based solvers for both power flow and PSSE tasks over popular WLS-based Gauss-Newton iterations and SDR approaches.

38 citations

Patent
13 Feb 2003
TL;DR: In this article, a power generator controller is provided, which includes a power system monitor and a generator output optimizing part for determining outputs of power generators at a predetermined interval under a supply and demand balancing constraint which imposes the agreement between electric power demanded and electric power supplied.
Abstract: There is provided a power generator controller which includes a power system monitor and a power generator output optimizing part. The power system monitor keeps check on a current status of a power system and puts out a demand on electricity. The power generator output optimizing part solves an objective function for determining outputs of power generators at a predetermined interval under a supply and demand balancing constraint which imposes the agreement between electric power demanded and electric power supplied. The objective function requires minimal total costs in power generation. Herein, the power generator output optimizing part solves the objective function further in consideration of an AFC capacity constraint that is determined based on an upper limit of changing speed of power generators.

38 citations

Journal ArticleDOI
TL;DR: In this article, the damping power system swings have been studied by analog and digital simulation, and the authors proposed a damping scheme based on analog simulation and analog simulation techniques.
Abstract: Techniques for damping power system swings have been studied by analog and digital simulation.

38 citations

Journal ArticleDOI
TL;DR: In this paper, two lemmas have been proved first which show the reasons for circulating power and then graph theory is applied to detect the existence of circulating power, and an optimal power flow (OPF) approach is suggested to eliminate circulating power.

38 citations

Journal ArticleDOI
Xing Li1, Mei Su1, Yao Sun1, Hanbing Dan1, Wenjing Xiong1 
TL;DR: In this article, a modulation strategy based on mathematical construction is proposed to extend the input reactive power range for the three-phase matrix converter, which offers clear physical meanings and less computational efforts.
Abstract: In this paper, a modulation strategy based on mathematical construction is proposed to extend the input reactive power range for the three-phase matrix converter, which offers clear physical meanings and less computational efforts. This strategy is developed based on the construction of the modulation matrix composed by the sum of several matrices, one of which is used to generate the required output voltage. The others are intended to provide more degrees of freedom for control such that the matrix converter can produce the input reactive power as much as possible. In the framework of mathematical construction method, an optimization problem for the maximum input reactive power is formulated, whose analytical solution is difficult to obtain. Usually, optimization problem can be solved by using some numerical methods, but lots of time will be consumed. Therefore, a suboptimal method is presented to mitigate the computational burden. Besides, the proposed strategy is compared with the optimum-amplitude and indirect SVM methods, in terms of the maximum input reactive power for different operating conditions. It is shown that the proposed method can obtain the maximum input reactive power over most situations. Finally, the correctness of the proposed method is confirmed by simulation and experimental results.

38 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202325
202283
2021162
2020179
2019228
2018221