基于低电压穿越控制策略的风电场等值方法  

A Low-Voltage Ride-Through Control Strategy Based Equivalence Method for Wind Farms

作　　者：侯俊贤[1] 陶向宇[1] 张静[2] 孙维真[2] 张石[1] 倪秋龙[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192 [2]国网浙江省电力公司,浙江省杭州市310027

出　　处：《电网技术》2015年第5期1281-1286,共6页Power System Technology

基　　金：国家863高技术基金项目(2011AA05A103)~~

摘　　要：风电场通常包括多台同类型的风电机组,在大电网仿真计算中需要将风电场等值,以减小仿真规模并保证仿真的准确性。提出了基于风电机组低电压穿越特性的风电机组倍乘等值台数确定方法,该方法主要考虑了实际风电场中各风电机组出力不同对风电场等值的影响,基于双馈、全变流类型风电机组在低电压穿越期间的有功、无功控制策略,确定比较合理的等值机组台数,最后将风电场等值为多台出力相同的风电机组。通过对实际风电场的仿真分析表明,在不同控制方式下,综合考虑不同电压跌落水平的有功、无功最佳等值台数是一个范围,进而可以综合确定一个等值台数,以兼顾准确性和保守性。一般情况下,离线仿真可选择最小可能台数,在线仿真可选择有功最佳台数范围内的最小台数。Generally, a wind farm is composed of many wind power generating sets of the same type. In the simulation of large-scale power grid the equivalence of wind farms should be carried out to reduce the scale of the simulation and to ensure the accuracy of the simulation. Based on the low-voltage ride-through （LVRT） characteristic of wind power generating set, a method that a wind farm can be equivalent to multi wind power generating sets with identical power output is proposed. In the proposed method the impacts of power outputs of all generating sets in the wind farm, which are different each other, on the equivalence of the wind farm are mainly considered. Based on the active power and reactive power control strategies for doubly fed wind power generating sets and full current conversion generating sets under LVRT, a more reasonable number of equivalent generating sets is determined, and finally a wind farm can be equivalent to a number of multi wind power generating sets with identical power output. Simulation results of actual wind farm show that under different control strategies the optimal number of equivalent generating sets, which is obtained by considering the active and reactive power under different voltage drop levels, is a range, and further the number of equivalent generating sets can be synthetically determined, while both accuracy, and conservation are taken into account. Under normal circumstances, the least possible number of generating sets can be determined by off-line simulation, and the least number of generating sets within the range of the number under the optimal active power can be selected by on-line simulation.

关 键 词：风电场等值 风电机组 低电压穿越 仿真模型 

分 类 号：TM743[电气工程—电力系统及自动化]