电网电压不对称骤升下直驱式风力发电系统的高电压穿越研究  

High Voltage Ride through Control Strategy of Direct- driven Wind Power Converter under Unbalanced Grid Voltage Swell

作　　者：周士琼[1] 王倩[1] 陈隆[1] 吕潇[1] 刘东霖[1] 倪亚玲 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]电子科技大学机械电子工程学院,四川成都610054

出　　处：《四川电力技术》2016年第4期58-62,共5页Sichuan Electric Power Technology

摘　　要：为实现直驱式风力发电系统的高电压穿越,提出一种在电网电压不平衡骤升工况下,基于网侧变流器的双重控制策略。当电网电压骤升超过额定电压的设定倍数时,网侧变流器增加无功输出,直流母线电压泄放电路进行电能释放,并且触发正负序电流控制,有效地抑制由于电网电动势不平衡造成的直流母线电压波动。仿真结果表明,所提控制策略能够保证在电网发生不对称骤升故障期间直驱式风力发电系统不脱网运行。A dual control strategy is proposed based on grid - side converter to achieve the high voltage ride through of direct - driv-en wind power generation system under unbalanced grid voltage swell. When the grid voltage is higher than the set multiple of rated voltage, the grid - side converter increases the reactive power output, the DC bus voltage discharge circuit releases energy and trig-gers the positive and negative sequence current control, which effectively suppresses the fluctuation of DC bus voltage due to the un-balanced electromotive force of the grid. Simulation results show that the proposed control strategy can guarantee the direct - driven wind power generation system is not in off - grid operation during the unsymmetrical grid voltage swell.

关 键 词：直驱式风力发电机组 不对称骤升 正负序分离 高电压穿越 

分 类 号：TM613[电气工程—电力系统及自动化]