Aiming at the stability prob-lems caused by the dynamic interactions between the existing parallel system of multi-grid-following (GFL) inverters and the weak grid
we study the influence of grid-forming (GFM) inverters on the stability of the grid-connected system in a multi-inverter grid-connected system
and propose a strategy for the proportional allocation of grid-following and grid-forming units in a multi-inverter grid-connected system. Based on the monotonicity of the power transfer of GFL inverters and the quasi-static model of mixed parallel connection of inverters
the influence of the interaction between the phase-locked loop (PLL) and the virtual synchronous machine (VSG) synchronization loop on the steady-state operating point of the GFL inverters and the GFM inverters is discussed to obtain the re-lationship between the synchronization stability
grid impedance and grid voltage in the grid-connected multivariate inverter system under a weak grid. The proposed strategy can derive the corresponding critical values of grid impedance for different unit ratio configurations
and then different unit ratio configurations are given according to different grid strengths to ensure the stable operation of the grid-connected multi-inverter system. The validity of the proposed method was experimentally verified.
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references
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COMBINED CONTROL STRATEGY FOR STABLE OPERATION OF PHOTOVOLTAIC CONNECT-GRID INVERTER IN WEAK GRID
NEW TYPE CAPACITTIVE VOLTAGE ACTIVE DAMPING STRATEGY FOR LCL GRID-CONNECTED INVERTER
计及需求响应的分布式光伏配电网双层优化规划
Related Author
颜湘武
张书瑞
蔡光
任浩洋
李锐博
贾焦心
汪海宁
王旭之
Related Institution
School of Electrical Information, Southwest Petroleum University
Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology
School of Electrical Engineering and Automation, He'nan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment, He'nan Polytechnic University
School of Electrical Engineering and Automation, Henan Polytechnic University
College of Electronic Science & Engineering, Jilin University