采用串联网侧变换器的双馈风电系统不对称高电压穿越控制研究  

Research on HVRT Control of DFIG System Based on Series Grid-Side Converter During Asymmetrical Grid Voltage Swell

作　　者：姚骏[1] 郭利莎 曾欣[1] 谭义[1] 尹潇[1] 

机构地区：[1]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》2016年第7期2067-2074,共8页Power System Technology

基　　金：国家自然科学基金资助项目(51477016);教育部中央高校基本科研业务费重点项目(106112015CDJZR155516)~~

摘　　要：在分析电网电压不对称骤升时双馈感应发电机暂态特性的基础上,从最大限度吸收电网无功功率角度出发,提出适用于采用串联网侧变换器的双馈风力发电系统的不对称高电压穿越控制策略,并对该系统的可控能力进行分析。所提控制策略在电网电压故障期间,通过控制串联网侧变换器维持定子电压恒定,并实现定子磁链暂态直流分量的抑制。通过控制并联网侧变换器维持直流母线电压恒定,同时利用变流器电流裕量实现对系统总输出有功或无功功率波动的抑制。通过控制机侧变换器实现双馈风电系统的功率解耦控制,并在变流器过流能力有限的约束条件下,最大限度吸收无功功率以实现对故障电网的暂态无功支持。仿真结果表明,所提控制策略既可有效实现双馈风电系统的不对称高电压穿越,同时也可增强所并电网的运行稳定性。Based on analysis of transient behavior of doubly-fed induction generator（DFIG） during asymmetrical grid voltage swell, this paper studies a high voltage ride through（HVRT） control strategy for DFIG-based wind power system with grid-side series converter to absorb maximum reactive power during high voltage fault. Controllability of the proposed system is analyzed. During grid voltage asymmetrical swell fault, with effective control of series grid-side converter（SGSC）, DFIG stator voltage can be kept invariable and transient DC component of stator flux can be suppressed. With control of grid-side parallel converter, DC-link voltage can be kept constant, and total active or reactive power output fluctuations could be eliminated. Furthermore, power decoupling control of DFIG system and transient reactive power support can be realized by controlling rotor-side converter. Simulation results indicate that the proposed control strategy can realize DFIG system HVRT during asymmetrical grid voltage swell and power grid stability is enhanced.

关 键 词：电网电压骤升 不对称故障 风力发电 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]