电网不对称故障下含飞轮储能单元的永磁直驱风电系统增强运行控制策略  

Enhanced Control of Direct-Drive Permanent Magnet Wind Power Generation System Containing Flywheel Energy Storage Unit During Asymmetrical Fault in Power Grid

作　　者：朱小军 姚骏[2] 蒋昆 夏先锋[2] 文一宇 龙虹毓 

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》2013年第5期1454-1463,共10页Power System Technology

基　　金：国家自然科学基金项目(51007097);中央高校基本科研业务费资助项目(CDJZR 11150009)~~

摘　　要：分析了电网不对称故障下含飞轮储能单元的永磁直驱风电系统直流母线电压波动机理,在此基础上,研究了适用于该类型风电系统低电压穿越增强运行控制策略。所提控制策略在实现电网不对称故障下发电系统向电网提供暂态无功支持的同时,亦可提供3种可选的独立运行模式。所提控制方案突破传统控制模式下网侧变换器抑制直流链电压波动能力的局限,将比例积分谐振控制器(proportional integralresonant,PIR)引入飞轮电机电流闭环控制,利用飞轮储能单元吸收直流电容2倍工频脉动功率,从而有效实现故障过程中直流链电压的稳定无波动控制,进一步增强系统不对称故障穿越运行能力。通过仿真计算验证了所提控制策略的正确性和有效性。The mechanism of DC bus voltage fluctuation in permanent magnet direct-drive wind power system containing flywheel energy storage unit during asymmetrical fault in power grid is analyzed, and on this basis an enhanced control strategy suitable to low-voltage ride through （LVRT） in such a wind power system is researched. Three selectable independent operating modes can be provided when the wind power system provides power grid transient reactive power support during asymmetrical fault in power grid by the proposed control strategy. The proposed control scheme surmounts the limitation of restraining DC-link voltage fluctuation by grid-connected converter undet traditional control modes and leads proportional integral-resonant （PI-R） controller into closed- loop current control of flywheel motor to absorb double power frequency pulsating power in DC-link capacitor by flywheel energy storage unit, thus the stable control of DC-link voltage free of fluctuation during asymmetrical fault in power grid can be effectively implemented and further enhance LVRT ability of wind power system under asymmetrical fault in power grid. The correctness and effectiveness of the proposed control strategy are verified by Matlab/Simulink-based simulation results.

关 键 词：风力发电 飞轮储能单元 永磁直驱风电系统 电网不对称故障 比例积分谐振控制器 

分 类 号：TM614[电气工程—电力系统及自动化]