大规模构网型储能集中接入对短路电流的影响分析

Analysis of the impact of large-scale centralized integration of grid-forming energy storage system on short-circuit currents

随着技术性能提升和成本降低,构网型储能集中并网规模不断扩大,其对系统短路电流的影响不容忽视。基于构网型储能的机电暂态仿真模型,分析不同限幅策略下设备的短路电流幅相特性,并通过算例仿真不同储能接入规模、过流能力、并网电压等级及运行工况下近区母线短路电流的变化情况,从多个角度揭示储能并网对近区母线短路电流的影响规律,量化构网型储能对并网母线短路电流的贡献幅值,并针对考虑短路电流提升效果的构网型储能容量配置及布点提出相关建议。

With technological advancements and cost reduction,the centralized integration of grid-forming energy storage system has significantly expanded.This integration notably impacts the short-circuit currents of power sys⁃tem,an effect that warrants careful consideration.This paper utilizes an electromechanical transient simulation model for grid-forming energy storage system to examine the amplitude and phase characteristics of short-circuit cur⁃rents under various limiting strategies.Case simulations are conducted to assess changes in short-circuit currents at nearby buses under different scales of energy storage system integration,overcurrent capabilities,grid voltage lev⁃els,and operating conditions.This comprehensive analysis reveals the influence of energy storage integration system on the bus short-circuit currents and quantifies the contribution of grid-forming energy storage system to the short-circuit currents.Based on these findings,the paper offers recommendations for capacity allocation and placement of grid-forming energy storage system,taking into account their impact on short-circuit current levels.