直驱型风力发电用并网变流器控制策略.pdfVIP

2 0 0 8 年 11 月 农 业 机 械 学 报 第 39 卷 第 11 期 直驱型风力发电用并网变流器控制策略 谢 　震 　张 　兴 　杨淑英 　郭 　栋 　　【摘要】　针对大功率直驱型风力发电系统中并网变流器输出电流含有较大电流谐波的问题 ,在并网变流器中 引入 L CL 型滤波器取代典型的电感滤波器 ,针对由此对系统带来的不稳定性 ,采用并网变流器电流间接控制结合 电网电压前馈补偿的控制策略 。针对直驱型风力发电系统在电网电压不对称下运行 ,采用一种双 dq 锁相环技术 , 构建了 15 kW 直驱型风力发电模拟平台 ,实验结果证明并网变流器可以稳定运行 , 同时具有较好的动静态性能 。 关键词 : 风力发电机 　并网变流器 　控制策略 　L CL 型滤波器 　双 dq 锁相环 中图分类号 : TM3 15 文献标识码 : A Control Strategy of Gridconnected Inverter Used in Direct Drives f or Wind Turbine Xie Zhen 　Zhan g Xing 　Yang Shuying 　Guo Dong ( Hef ei Univers ity of Tech nology , Hef ei 230009 , Chi na) Abstract In highpower direct drives for wind t urbine , t he cont rol of gridconnected inverter is vit al to power t ransporting and energy converting , and t he outp ut current wit h harmonic distortion is high . A filter , t ypically a series induct ance , is adopted to reduce t he switching harmonics entering t he dist ribution network . An alternative filter is a L CLfilter , which can reduce t he level of harmonic distortion . The cont rol st rategy of gridconnected inverter was used in t his system based on a loop of bridge current regulator wit h grid volt age feed forwar d . A new decoupled double synchronous reference frame p haselocked loop was adopted in t his system under unbalanced and distorted grid conditions. A 15 kW direct drive for wind t urbine system was const ructed in t he laboratory . The result s p rove t hat t he gridconnected inverter can run st ability and has good performances. Key words 　Wind t urbine generator , Gridconnected inverter , Cont rol st ra