摘要
采用双脉宽调制(PWM)变换器作为双馈感应发电机(DFIG)变速恒频风力发电系统的励磁电源,分析了变换器数学模型及系统的控制策略。网侧变换器采用电网电压定向控制策略,目的是保持直流母线电压稳定和网侧单位功率因数运行,实现能量的双向流动;转子侧变换器采用定子磁链定向控制策略,以实现最大风能捕获和定子无功功率的调节。利用MATLAB软件建立了仿真模型。仿真结果表明,网侧在整流和逆变状态都能实现单位功率因数运行;双馈电机转速能快速跟踪风速变化;电机在亚同步、同步、超同步三种状态运行时,转子电流频率满足变速恒频运行条件;同时实现了定子无功功率的独立调节。
Adopting double-PWM converter as AC-supply of variable speed constant frequency wind power system based on doubly fed induction generator, the mathematic model of converter and the control strategies of system are analyzed. Grid-side adopts the control strategy of grid voltage orientation to achieve the stability of DC-link voltage, unity power factor of grid-side and bi-direction flowing ability of energy. Rotor-side adopts the control strategy of stator flux orientation to achieve maximum wind-energy capturing and adjustment of reactive power of stator. Simula- ted model is built by using software MATLAB. Simulated results show that grid-side can be ran at unity power factor both rectified state and reverse state, the speed of DFIG can track wind speed quickly, rotor current satisfies the condition of VSCF and system achieves independent adjustment of reactive power of stator.
出处
《电机与控制应用》
北大核心
2009年第7期39-43,共5页
Electric machines & control application
基金
内蒙古自治区自然科学基金重大项目(200711020801)
关键词
双脉宽调制变换器
双馈感应发电机
变速恒频
double-PWM converter
doubly-fed induction generator （DFIG）
variable speed constant frequency
