多逆变器基于设备馈入系统通用短路比：定义与理论分析
Generalized Short Circuit Ratio for Multi Power Electronic based Devices Infeed Systems: Defi-nition and Theoretical Analysis
AI总结：
本文提出通用短路比(gSCR)用于分析多馈入系统中交流电网的稳定性，通过分解系统并考虑运行点变化，验证了其有效性。
摘要：
短路比(SCR)广泛用于分析交流系统强度和单逆变器基于设备馈入系统(SPEISs)的小扰动稳定性。然而，缺乏适用于多逆变器基于设备馈入系统(MPEIS)的SCR理论，因多逆变器设备间的复杂耦合导致稳定性分析困难。本文首先提出通用短路比(gSCR)概念，从小扰动稳定性角度测量多馈入系统中连接交流电网的强度。通常，gSCR通过将多馈入系统分解为n个独立单馈入系统，从物理和数学上扩展传统SCR。然后基于gSCR提出操作gSCR(OgSCR)，以考虑运行点变化。此外，参与因子和灵敏度也被分析。最后通过仿真验证所定义的gSCR和OgSCR的合理性与有效性。
英文摘要：
Short circuit ratio (SCR) is widely applied to analyze the strength of AC system and the small signal stability for single power elec-tronic based devices infeed systems (SPEISs). However, there still lacking the theory of short circuit ratio applicable for multi power electronic based devices infeed systems (MPEIS), as the complex coupling among multi power electronic devices (PEDs) leads to difficulties in stability analysis. In this regard, this paper firstly proposes a concept named generalized short circuit ratio (gSCR) to measure the strength of connected AC grid in a multi-infeed system from the small signal stability point of view. Generally, the gSCR is physically and mathematically extended from conven-tional SCR by decomposing the multi-infeed system into n inde-pendent single infeed systems. Then the operation gSCR (OgSCR) is proposed based on gSCR in order to take the variation of op-eration point into consideration. The participation factors and sensitivity are analyzed as well. Finally, simulations are conducted to demonstrate the rationality and effectiveness of the defined gSCR and OgSCR.
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