Journal of Electric Power Science and Technology. 2021, (04) Core

Coordinated control strategy for low frequency oscillations of weak AC grid connected PV systemsChinese Full Text

BI Yue;FANG Sirui;YU Shuqi;Sichuan Electric Power Engineering Branch of State Grid Sichuan Comprehensive Energy Service Co., Ltd.;College of Electrical Engineering, Sichuan University;The College of Nuclear Technology and Automation Engineering, Chengdu University of Technology;

Abstract: According to the actual distribution of solar energy in China, large-scale photovoltaic power plants frequently connect to weak delivery AC systems, which have a low short-circuit capacity but a high background harmonic content. The large capacity of photovoltaics connecting to the grid has already made a significant impact on the end grid’s damping characteristics, meanwhile providing a new method to suppress low frequency oscillation. Under the background, on the basis of the four-machine two-area system, an electromagnetic transient simulation model including large-capacity photovoltaic plantsis set up. And the low frequency oscillation characteristics of the system areanalyzed by the total least squares-estimation of signal parameters via the rotational invariance technique（TLS-ESPRIT）. Aiming at coordinatelysuppressing low frequency oscillation in intra-area and inter-area, the additional damping controller designed by linear quadratic regulator（LQR） control method with an observer isrespectively set in the different control loop of photovoltaic inverter and SVG. Simulation results show that the proposed method can effectively suppress the low frequency oscillation and increase the system’s capability ofsending power in a certain extent.

Keywords：

weak AC system; low frequency oscillation; photovoltaic; static var generator; coordinated control;

DOI：
10.19781/j.issn.1673-9140.2021.04.008
Series：
(C) Architecture/ Energy/ Traffic/ Electromechanics, etc
Subject：
Electric Power Industry
Classification Code：
TM712;TM615

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Coordinated control strategy for low frequency oscillations of weak AC grid connected PV systemsChinese Full Text

BI Yue;FANG Sirui;YU Shuqi;Sichuan Electric Power Engineering Branch of State Grid Sichuan Comprehensive Energy Service Co., Ltd.;College of Electrical Engineering, Sichuan University;The College of Nuclear Technology and Automation Engineering, Chengdu University of Technology;

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