串联补偿线路对光伏发电系统稳定性影响  

Influence of series compensation lines on PV system stability

作　　者：苗淼[1] 何维[2] 张祥成[3] 王龙飞[2] 周翩[2] 胡家兵[2] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]华中科技大学强电磁工程与新技术国家重点实验室,湖北武汉430074 [3]国网青海省电力公司青海省光伏发电并网技术重点实验室,青海西宁810008

出　　处：《电力自动化设备》2016年第9期106-113,共8页Electric Power Automation Equipment

基　　金：国家电网公司总部科技项目(522830140003)~~

摘　　要：通过建立含串联补偿线路的无穷大电源-单光伏变换器系统的小信号分析模型,借鉴复转矩系数法,分析了不同串补度情况下串联补偿线路对电流控制与直流电压控制的影响,发现随着串补度的提高,电流控制的阻尼随之削弱,而直流电压控制则不受影响,对此分别给出了相应的物理解释。考虑到锁相环引起的负阻尼效应,发现串联补偿线路可能造成光伏变换器发生不稳定现象。在PSCAD/EMTDC电磁暂态仿真软件中搭建了详细的模型,并对仿真模型进行了模态分析,时域仿真结果和模态分析证实了文中所提观点。The small signal analysis model of an infinite bus system connected with a converter via series compensation lines is established and the complex torque coefficient method is applied to analyze the influence of series compensation lines on the current control and DC voltage control for different compensation degrees. It is found that,the damping of current control becomes weaker along with the increase of compensation degree while the DC voltage control is not impacted,for which the corresponding physical explanations are respectively given;the series compensation lines may cause the instability of PV converter due to the negative damping effect induced by the phase locked loops. A detailed model is built with PSCAD / EMTC and the time-domain simulation,together with the modal analysis,verifies the given conclusions.

关 键 词：光伏 稳定性 串联补偿 直流电压控制 电流控制 变换器 锁相环 次同步振荡 

分 类 号：TM615[电气工程—电力系统及自动化]