采用串联网侧变换器的双馈风电系统高电压穿越控制策略  

High Voltage Ride-Through Control Strategy of Doubly-Fed Induction Generator Based Wind Turbines With A Series Grid-Side Converter

作　　者：李俊杰 蒋昆 刘国平 曾欣[2] 余梦婷[2] 姚骏[2] 

机构地区：[1]重庆市电力科学研究院,重庆市渝北区401123 [2]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《电网技术》2014年第11期3037-3044,共8页Power System Technology

基　　金：国家自然科学基金项目(51477016)~~

摘　　要：针对采用串联网侧变换器的双馈风电系统电机定子端电压灵活可控的特点,提出了适用于该系统的对称高电压穿越控制策略。该策略通过控制串联网侧变换器,实现电网电压对称骤升时发电机定子电压保持不变,从而抑制定子磁链的暂态直流分量,使得电机转子过电压及过电流得到有效抑制,且可有效减小发电机电磁转矩及功率的波动。在变流器电流容量的约束下,故障期间通过控制转子侧变换器与并联网侧变换器吸收无功功率,可实现该系统对电网的故障暂态无功支持。仿真结果表明,所提控制策略既能保证在电网发生对称骤升故障期间双馈风电系统不脱网运行,又可使该系统为电网电压的恢复提供无功支持。Based on the advantages of doubly-fed induction generator（DFIG）-based wind turbine with a series grid-side converter（SGSC）,this paper studies a control strategy for high voltage ride through（HVRT） operation for such a DFIG system.During grid voltage symmetrical swell fault,with the effective control of the SGSC,the DFIG stator terminal voltage can be kept invariable,which suppresses the transient DC component of the stator＇s flux.As a consequence,the over-current and over-voltage of DFIG can be eliminated,and the power and electromagnetic torque fluctuations of DFIG can be suppressed.Furthermore,by considering the current rating of the converters,the proposed strategy can supply the transient reactive power support for the grid by controlling rotor side converter（RSC）and parallel grid side converter（PGSC） respectively.The simulation results indicate that the proposed strategy can achieve the HVRT operation for the DFIG system during grid voltage symmetrical swell fault,in the meanwhile,the transient reactive power support can be provided to recover the grid voltage.

关 键 词：风力发电 双馈感应发电机 串联网侧变换器 高电压穿越 暂态无功支持 

分 类 号：TM614[电气工程—电力系统及自动化]