一种应用于双馈异步风力发电系统高电压穿越的控制策略  

A High-voltage Ride-through Control Strategy for DFIG Based Wind Turbines Considering Dynamic Reactive Power Support

作　　者：闵泽生 李华银 杜睿 MIN Zesheng LI Huayin DU Rui(Dongfang Electric Auto Control Engineering Co., Ltd., 618000, Deyang, Sichuan, China)

机构地区：[1]东方电气自动控制工程有限公司,四川德阳618000

出　　处：《东方电气评论》2017年第2期66-72,共7页Dongfang Electric Review

摘　　要：文章讨论了电网电压骤升时双馈风电机组网侧和转子侧变流器有功、无功功率的分配原则,给出有功、无功电流的极限表达式,提出一种能有效提供动态无功支持的高电压穿越(high voltage ride-through,HVRT)实现方案。在机组端电压骤升至1.1倍标称值以上时,该方案一方面控制网侧变流器输出与电压骤升幅度相匹配的无功电流,实现母线电压的稳定;另一方面通过优化转子侧变流器有功、无功电流设定,使双馈感应发电机工作在无功支持模式,优先向故障电网输出一定的感性无功功率。仿真和基于东方风电6 MW试验台实验结果表明,该控制方案不仅能确保电网电压骤升期间双馈风电机组的不脱网运行,还能对故障电网提供一定的动态无功支撑,协助电网电压快速恢复,利于其它并网负载的安全运行。This paper delivers discussions on principle of assigning active and reactive power for the grid and rotor side converters of a double fed induction wind turbine generator （DFIG）, along with equations of current limits of the active and reactive power. Furthermore, a high voltage ride-through（HVRT） control scheme with the dynamic reactive power supporting to the grid is submitted. When the terminal voltage soars to more than 1.1 times of its nominal value, the grid side converter outputs reactive current that matches the surge margin to realize stability control of the bus voltage. On the other hand, by optimizing the rotor side converter＇s active and reactive current, the DFIG operates in the reactive power supporting mode, giving priority to output certain inductive reactive power. Both the simulation and experiment studies show that the proposed control scheme is capable of not only ensuring uninterruptable operation of the DFIG system during the grid voltage swelling conditions, but also providing certain dynamic reactive power supporting to the grid, which benefits the fast recovery of the faulty grid and ensures the safe operation of other grid-connected loads.

关 键 词：双馈感应发电机 变流器 高电压穿越 无功支持 

分 类 号：TM315[电气工程—电机]