电网三相短路故障下并网虚拟同步发电机的暂态特性评估与提高  

Transient Characteristics Assessment and Enhancement of Grid-Forming Virtual Synchronous Generators During Three-Phase Short Circuit Fault of Grid

作　　者：翁利国 徐国锋 俞蓉 洪达 赵芹 WENG Liguo;XU Guofeng;YU Rong;HONG Da;ZHAO Qin(State Grid Hangzhou Xiaoshan Power Supply Company,Hangzhou,Zhejiang 311200,China;Zhejiang Zhongxin Power Engineering Construction Co.,Ltd.,Hangzhou,Zhejiang 311200,China)

机构地区：[1]国网浙江杭州市萧山区供电有限公司,浙江杭州311200 [2]浙江中新电力工程建设有限公司,浙江杭州311200

出　　处：《自动化应用》2024年第2期30-35,共6页Automation Application

基　　金：浙江大有集团有限公司科技项目(DY2022-28)。

摘　　要：与同步发电机相比,虚拟同步发电机(VSG)的显著缺点是没有过流能力,故障发生时的过电流会损坏逆变器的器件。对此,研究电网三相短路故障下VSG的暂态问题综合考虑了电压控制和功角稳定性电流限制,通过增大虚拟阻抗和改变有功功率参考值,可限制VSG输出电流,保持VSG功角稳定。此外,细化和定义了电网三相短路故障VSG的暂态过程阶段,研究了虚拟电感和功率参考值在各阶段的调节范围,并提出了改善VSG短路故障暂态特性的控制策略。The significant disadvantage of virtual synchronous generators(VSG)compared to synchronous generators is that there is no overcurrent capacity,which can damage the inverter components in the event of failure.Therefore,the transient problem of VSG under three-phase short-circuit fault of grid is studied comprehensively considering voltage control and current limitation of power angle stability.By increasing virtual impedance and changing active power reference value,the output current of VSG is limited to keep the power angle of VSG stable.In addition,the transient process stages of VSG three-phase short circuit fault are refined and defined,and the regulation range of virtual inductance and power reference value in each stage is studied,and the control strategy to improve the transient characteristics of VSG short-circuit fault is proposed.

关 键 词：并网虚拟同步发电机 功角稳定性 电流限制 三相短路故障 暂态特性 

分 类 号：TM341[电气工程—电机]