风电接入对继电保护的影响(二)——双馈式风电场电磁暂态等值建模研究  

Impact of wind farm integration on relay protection(2):DFIG-based wind farm electromagnetic transient equivalent model

作　　者：张保会[1] 李光辉[1] 王进[1] 郝治国[1] 张金华[1] 黄仁谋[2] 王小立[1,3] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]海南电网公司,海南海口570100 [3]宁夏电力公司调度中心,宁夏银川750001

出　　处：《电力自动化设备》2013年第2期1-7,共7页Electric Power Automation Equipment

基　　金：国家高技术研究发展计划(863计划)资助项目(2012-AA050201)~~

摘　　要：提出建立双馈式感应发电机(DFIG)风电场多机等值方案。考虑到DFIG风机短路故障条件下投入转子Crowbar保护后,短路电流与转子实时转速相关的特点,提出以短路故障前瞬间的风机转子转速值作为DFIG风机分群的指标,以准则函数E收敛后得到的值最小为分群标准,采用K-means算法将具有相近指标的机组分到同一机群中。针对单个机群中可能存在多种型号DFIG风机的情况,采用基于容量加权的参数聚合法,计算等值风电机组转子运动方程参数、阻抗参数、变流器及其控制环节参数和箱式变压器参数。在PSCAD/EMTDC平台上建立DFIG风电场详细模型及其等值模型,仿真结果表明在相同故障条件下,风电场等值模型的故障电流能够很好地拟合详细模型。A multi-machine equivalence scheme is proposed for the electromagnetic transient numerical simulation of large-scale DFIG-based wind farm. Since the short circuit current is related to the real-time rotor speed after the rotor Crowbar protection is put into operation during the short circuit fault of DFIG- based wind generator,it is proposed that,the rotor speed just before the short circuit fault is taken as the classification index of DFIG-based wind generators. With the minimum value of the criterion function E after coiavergence as the criterion,the K-means clustering algorithm is applied to classify the generators with similar index. As there may be several types of DFIG-based wind generator in a group,the capacity- weighted aggregation is applied to calculate the parameters of the equivalent wind power generators,i.e, the parameters of rotor motion equation,impedance,converter and its controller,and box-type transformer. The detailed model of a DFIG-based wind farm and its equivalent model are established on PSCAD/EMTDC platform and the simulative results show that,under the same fault condition,the fault current of equivalent model fits well that of the detailed model.

关 键 词：DFIG 风电场 模型 电磁暂态等值 继电保护 短路电流 风电 

分 类 号：TM614[电气工程—电力系统及自动化] TM77