摘要
此处建立了自同步型光伏(SS-PV)并网发电系统小信号模型,分析了其系统特征根受主要关键控制参数影响的变化轨迹,指出了SS-PV存在的振荡风险及其产生机理。基于现有自同步型新能源控制策略,进一步引入了虚拟阻抗算法并通过小信号模型分析了虚拟阻抗对SS-PV电压致稳控制的有效性,以及对系统特征根分布的改善作用。最后通过300 kW功率等级的SS-PV样机平台对理论分析的正确性进行了实验验证。
A small signal model of self-synchronous-photovoltaic(SS-PV) grid-connected power generation system is established,and the variation trajectory of the system characteristic root affected by the main key control parameters is analyzed.The oscillation risk of SS-PV and its generation mechanism are pointed out.Based on the existing self-synchronous new energy control strategy,the virtual impedance algorithm is further introduced,and the effectiveness of virtual impedance on SS-PV voltage stabilization control and the improvement of the system characteristic root distribution are analyzed by small signal model.Finally,the correctness of the theoretical analysis is verified by experiments on the SS-PV prototype platform with 300 kW power level.
作者
王卫
王海云
张再驰
陈茜
WANG Wei;WANG Hai-yun;ZHANG Zai-chi;CHEN Qian(State Grid Beijing Power Dispatching and Control Center,Beijing 100031,China)
出处
《电力电子技术》
北大核心
2023年第2期77-80,共4页
Power Electronics
基金
国网北京市电力公司科技项目(52022320006H)。
关键词
光伏
自同步型
小信号模型
特征根
photovoltaic
self-synchronous
small signal model
characteristic root
