摘要
研究风力发电系统稳定性优化问题,针对双馈风力发电时变与多耦合工作特性及低电压穿越能力不够问题。为保障供电网的稳定安全,首先在分析机组工作原理基础上进行数学建模,网侧变换器采用电网电压定向的矢量控制策略,机侧变换器采用定子磁链定向的矢量控制策略,引入电网电压、转子电流扰动前馈补偿控制。其次,直流母线引进储能系统,通过双向DC/DC变换器控制电池充放电,有效抑制电网电压跌落时直流母线电压上升,提高系统低电压穿越能力。仿真结果表明,上述控制策略能实现定子输出功率的解耦控制和最大风能追踪控制,为电机系统抗扰能力控制优化提供了参考。
Due to the problems of double-fed wind power unstable and multi-variable coupling operating charac- teristics and weak capacity of low voltage ride through, firstly, a mathematical model of the system was established based on the principle analysis of unit structure. For grid side converter, grid voltage oriented vector control strategies were used, and for machine side converter, the stator flux oriented vector control strategy was used. The feed-forward compensation disturbance control of voltage and rotor current was introduced. Secondly, the storage system was intro- duced on the DC bus, a bidirectional DC/DC converter was used to control battery charge and discharge, suppressing the DC bus voltage rising effectively at the time of low voltage ride-through（LVRT） and improving the capability of LVRT. Simulation results show that the control strategy can achieve the decoupling control of stator output power and maximum wind energy tracking control, the system immunity can be enhanced significantly.
出处
《计算机仿真》
CSCD
北大核心
2016年第7期200-204,222,共6页
Computer Simulation
基金
国家自然科学基金面上项目(E0712)
江苏省高校自然科学研究面上项目资助(15KJB470014)
关键词
双馈风力发电
矢量控制
储能
低电压穿越
抗扰动
DFIG
Vector control
Energy storage
Low voltage ride-through （LVRT）
Anti-disturbance
