Stability analysis of power self-synchronization control of grid-forming converters in wide range of short-circuit ratio conditions
DOI：10.19783/j.cnki.pspc.240664
Key Words:wide short-circuit ratio  grid-forming converter  power self-synchronization  stability analysis  hardware-in-the-loop real-time simulation
Author NameAffiliation
MA Junpeng1 1. China Electric Power Research Institute, Beijing 100192, China, 2. School of Electrical Engineering, Sichuan University, Chengdu 610065, China 
LI Lei2 1. China Electric Power Research Institute, Beijing 100192, China, 2. School of Electrical Engineering, Sichuan University, Chengdu 610065, China 
CHI Chengbin1 1. China Electric Power Research Institute, Beijing 100192, China, 2. School of Electrical Engineering, Sichuan University, Chengdu 610065, China 
WANG Shunliang2 1. China Electric Power Research Institute, Beijing 100192, China, 2. School of Electrical Engineering, Sichuan University, Chengdu 610065, China 
LIU Tianqi2 1. China Electric Power Research Institute, Beijing 100192, China, 2. School of Electrical Engineering, Sichuan University, Chengdu 610065, China 
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Abstract:Grid forming (GFM) voltage source converters (VSC) based on the power synchronization control (PSC) are used to support the grid by emulating the power angle characteristics of synchronous machines. However, they face oscillation risks under wide range of short-circuit ratio (SCR) conditions. To analyze the stability of GFM converters under wide range SCR conditions, this paper establishes a small-signal PSC-VSC model, and the transfer functions of active and reactive power are derived. Based on this, the small-signal instability mechanism of GFM converters under wide range of SCR conditions is revealed. The results show that PSC-VSC faces small-signal instability risks in strong grid conditions. Subsequently, by limiting the gain of the active power transfer function, the power self-synchronization control (PSSC) based VSC control strategy is proposed to enhance the stability of GFM converters in strong grid conditions. Furthermore, the stability of PSSC-based GFM converters under grid faults is analyzed. Finally, the correctness and effectiveness of the proposed analysis method are verified through hardware-in-the-loop real-time simulation.
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