适用于低电压穿越仿真的风电场内集电线路等值方法  

Collector Network Equivalent Method of Wind Farm for Low Voltage Ride Through Simulation

作　　者：陈钊[1] 夏安俊[2] 汪宁渤[1] 乔颖[2] 马彦宏[3] 

机构地区：[1]甘肃省新能源并网运行控制重点实验室,甘肃省电力公司风电技术中心,甘肃省兰州市730050 [2]清华大学,电力系统及发电设备控制和仿真国家重点实验室,北京市100084 [3]国网甘肃省电力公司,甘肃省兰州市730030

出　　处：《电力系统自动化》2016年第8期51-56,共6页Automation of Electric Power Systems

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA05A104);国家电网公司科技项目(522727140006,52272714000Y)

摘　　要：以二机并联模型为基础,提出了一种适用于低电压穿越(LVRT)仿真的风电场内集电线路的等值方法。以电网电压跌落期间风电场并网点的无功输出量一致为原则对线路的电抗进行等效;以风电场内线路的有功损耗相等为原则对线路的电阻进行等效。经过集电线路阻抗变换后,风电场等效为一台经过一等值阻抗直接连接到公共连接点(PCC)的单机等值模型。该方法适用于干线式、放射式和混合式集电线路拓扑的等值,且计算所得线路阻抗参数恒定,便于实际应用。仿真结果表明,在电网故障期间,等值模型具有很高的精度。Based on the two-machine parallel model, a method of collector network equivalence for wind farm is presented, which is suitable for low voltage ride through （LVRT） simulation. The equivalence of line reactance is based on the principle that the output reactive power of wind farm at the point of common coupling （PCC） before and after the transformation should be consistent during the grid voltage dip, and the equivalence of line resistance is based on the principle that the active power losses of collector network should be equal. By the impedance transformation of collector network, the wind farm can be made equivalent to a single-machine model connected to the PCC through an equivalent impedance. The line impedance equivalent method proposed is applicable to the equivalence of collector networks with tree like, radial or hybrid topology, and the calculated parameters of line impedance are constant which is convenient for actual application. Simulation results show that the equivalent model has high precision during a power system fault.

关 键 词：风电场 集电线路 等值模型 低电压穿越 

分 类 号：TM614[电气工程—电力系统及自动化]