低电压过渡能力测试设备的阻抗变化对风机入网电流的影响分析  

The Effect of Low Voltage Ride Through Test Impedance Variation to Grid Current of Wind Turbines

作　　者：张叔禹 赵永飞[1] 王乐媛[1] 何芳[1] 公维炜[1] 

机构地区：[1]内蒙古电力科学研究院,呼和浩特010020

出　　处：《内蒙古电力技术》2014年第4期5-9,共5页Inner Mongolia Electric Power

摘　　要：在蒙西地区某风电场进行了风力发电机组低电压过渡能力测试试验,建立风力发电机在接有低电压过渡能力测试设备时的阻抗模型,理论分析测试设备在串、并联电抗投切过程中引起的风机入网电流变化情况。分析结果为:低电压过渡能力测试设备的并联阻抗越小,风机的入网电流就会越大。对此,结合现场测试经验,建议对于测试设备应选择最佳的阻抗配置,当电网电压跌落比较小时,由于入网电流变化较小,可采用较小的限流阻抗;当电压跌落较大时,则需要较大的限流阻抗。这样可减小电流对风机的冲击,使风机低电压过渡能力测试试验顺利进行。After the low voltage ride through tests are producted in West InnerMongolia, the impedance model of low voltage ride through test equipment ability with thewind turbine is established and grid current change caused by series, parallel impedanceswitching is analyzed theoretically.The results show that the parallel impedance of lowvoltage test equipment is smaller, the grid current will become larger. So the suggestionof the optimal configuration of impedance in the equipment is proposed is that when thevoltage drop is small, the grid current change is small, the smaller current limitingimpedance can be used; when the voltage drop is bigger, the bigger current limitingimpedance can be used. Thus we can reduce effect of grid current to ensure the lowvoltage ride through test smooth.

关 键 词：风力发电机 低电压过渡能力 电网电压跌落 低电压控制技术 阻抗 入网电流 

分 类 号：TM315[电气工程—电机]