光伏经新能源同步机并网小干扰模型及次同步振荡抑制作用  

Small Signal Model of Photovoltaic Grid-connected via Motor-Generator Pair and the Mechanism of Restraining Subsynchronous Oscillation

作　　者：管飞 黄永章 杨鑫 付文启 武倩羽 李晨阳 GUAN Fei;HUANG Yongzhang;YANG Xin;FU Wenqi;WU Qianyu;LI Chenyang(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;NCEPU(Yantai)Power Semiconductor Technology Research Institute Co.,Ltd,Yantai 264010,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]华电(烟台)功率半导体技术研究院有限公司,山东烟台264010

出　　处：《华北电力大学学报（自然科学版）》2022年第1期58-67,共10页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网公司总部科技项目“超高占比新能源电网发电控制系统与运行控制策略研究”(XT71-18-041).

摘　　要：针对光伏并网换流器弱阻尼引发的次同步振荡问题,提出了光伏采用新能源同步机(Motor-Generator Pair,MGP)来抑制振荡的新思路。阐述了MGP的结构和阻尼特性;通过研究光伏与MGP的电气连接关系推导了光伏经MGP并网的小干扰模型;通过特征值分析了换流器电压外环与电流内环控制参数对光伏直接并网和采用MGP并网振荡模态的影响特性,并进行了仿真验证。结果表明:光伏采用MGP并网后系统振荡形式由电力电子器件主导的电磁振荡过渡为同步机主导的机电振荡,MGP可有效提升系统正阻尼且对换流器控制参数的响应更为灵敏,参数同条件调节后,配置MGP的光伏系统可更快速的过渡至稳定区域。Since weak damping of photovoltaic grid-connected converter causes the subsynchronous oscillation,Motor-Generator Pair(MGP)is proposed in this paper as a new grid-connected method for photovoltaic to restrain the subsynchronous oscillation.We first described the structure and damping characteristics of MGP.Then we studied the electrical connection relationship between PV and MGP to deduce a small-signal model of PV grid-connected via MGP.The influence of voltage-loop and current-loop control parameters of the converter on the oscillation modes of PV and PV with MGP was analyzed by eigenvalue analysis,and the analysis was verified by simulation.The results show that the oscillations of the photovoltaic system can be transformed from electromagnetic oscillations dominated by power electronic devices to electromechanical oscillations dominated by synchronous machines after the MGP is connected to the grid.PV with MGP can effectively enhance the positive damping of the power grid.In addition,MGP responds more sensitively to converter control parameters.When the parameters are adjusted with the same conditions,the photovoltaic system equipped with MGP can transit to the stable region more quickly.

关 键 词：光伏并网 新能源同步机 次同步振荡 小干扰建模 阻尼 

分 类 号：TM712[电气工程—电力系统及自动化]