AUTHOR=Zhao Zhengkui , Su Xiaoling , Yang Jun , Zhou Peng , Chen Hui , Lu Guoqiang 

TITLE=Droop-based active voltage regulation control and robust stability analysis for VSCs in the large-scale RES-integrated power system

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.1005593

DOI=10.3389/fenrg.2022.1005593

ISSN=2296-598X

ABSTRACT=New features like high penetration level, low inertia, weak damping is decreasing voltage support capacity in power system as it sees large-scale renewable energy sources (RESs) integration continuously. The reasonable solution to this challenge is developing additional active voltage regulation function for voltage source converters (VSCs). This paper proposes a droop-based active voltage control strategy for VSCs in large-scale RESs integrated power system to make VSCs continue to operate and regulate voltage at the point of common coupling (PCC) during a fault without causing overcurrent. In order to meet the requirements of RESs and Grid Code, all control boundary conditions are designed based on practical engineering data. Meanwhile, plant uncertainty and parameter disturbance is introduced into robust stability margin analysis model based on component connection method (CCM) and structured singular value (SSV) to improve the engineering application prospect. The effectiveness and feasibility of this control strategy is proved by logical deduction and practical simulation based on generalized small-signal model.