不对称条件下的新能源电压无约束支撑方法  

Study on Unconstrained Support Method for New Energy Voltage under Asymmetric Condition

作　　者：李慧蓬 樊瑞 李世林 LI Huipeng;FAN Rui;LI Shilin(l.Electric Power Research Institute of State Grid Shanxi Electric Power Company,Taiyuan,Shanxi 030001,China;College of Electrical Engineering,Shanghai University of Electric Power,Shanghai,200090,China)

机构地区：[1]国网山西省电力公司电力科学研究院,山西太原030001 [2]上海电力大学电气工程学院,上海200090

出　　处：《山西电力》2023年第1期1-4,共4页Shanxi Electric Power

基　　金：国网山西省电力公司科技项目(520530200011)。

摘　　要：国家标准规定,在电网故障期间,新能源发电需要主动支撑公共连接点处的电压,但阻感性电网(线路电阻较大不可忽略)的电压支撑由于受到阻抗比的约束,支撑难度较大。提出了一种新的无约束电压支撑方案,并推导出电压支撑方案的无功参考电流表达式,可根据补偿要求,调整无功参考电流,从根本上解决了电压支撑不足的问题。仿真结果表明,所提出的电压支撑方案在阻感性电网中具有较好的电压支撑效果。According to national standards,during power grid failure,new energy generation needs to actively support the voltage at the point of common coupling(PCC).However,the voltage support of resistive power grid(the line resistance is too large to be ignored)is difficult to get because of the restriction of impedance ratio.In this paper,a new unconstrained voltage support scheme(VSS)is proposed.The reactive reference current expression of the voltage support scheme is derived,and the reactive reference current can be adjusted according to the compensation requirements,which fundamentally solves the problem of insufficient voltage support.The simulation results show that the proposed voltage support method has a good support effect in the resistive power grid.

关 键 词：电压支撑方案 低电压穿越 电压暂降 新能源发电 并网逆变器 

分 类 号：TM615[电气工程—电力系统及自动化]