摘要
讨论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。
The active and reactive power assignation principle was discussed for the grid and rotor side converters of a double fed induction generator based wind turbine with their active and reactive current limits considered. Furthermore, a high voltage ride-through （HVRT） control scheme with the dynamic reactive power supporting to the grid was put forward. When the terminal voltage soars to more than 1.1 times of its nominal value, the grid side converter is controlled, on the one hand, to output reactive cu（rent, which matches the surge margin and thus realizes stability control of the bus voltage. On the other hand, by optimizing the rotor side converter＇s active and reactive current instruction, 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.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2013年第36期112-119,16,共8页
Proceedings of the CSEE
基金
国家自然科学基金项目(50907057)
浙江省自然科学基金项目(LY13E070001)
教育部博士研究生学术新人奖资助项目~~
关键词
双馈感应发电机
变流器
高电压穿越
无功支持
doubly fed induction generator （DFIG）
converter
high voltage ride-though （HVRT）
reactive power supporting
