关键词: 构网型 SVG, 短路比, 系统电压强度, 优化配置

Abstract: With the accelerated promotion of China’s new energy power system, large-scale grid connected operation of new energy units will induce voltage instability risks in the power system. To address this technical challenge, a SVG( Static Var Generator) can be used to output reactive power to enhance the voltage support capability of the power grid. However, its optimization configuration method still needs further research. To solve this technical problem, the grid type SVG with autonomous voltage regulation capability enhances the voltage support capability of the power grid by outputting reactive power, but its optimization configuration method still needs further research. In response to this demand, the MRSCR( Multiple New Energy Station Short Circuit Ratio) is uesd as an indicator for assessing voltage stability and develops a quantitative model to analyze the voltage support capability of the power grid, and focuses on revealing the mechanism of the improvement of MRSCR index by grid connected SVG. Based on the constraint of voltage stability critical threshold, a configuration model with device capacity optimization as the objective is constructed, and a multi-objective optimization configuration method for grid type SVG considering voltage stability is proposed. The simulation results show that the proposed configuration method can significantly improve the voltage support characteristics of the system nodes in the transient process.

Key words: grid forming static var generator ( SVG ), short-circuit ratio, system voltage strength, optimize configuration