变速恒频双馈风力发电系统网侧变流器控制策略研究

Research of Grid-side converter control strategy for Variable-speed Constant-frequency Doubly-fed wind power generator system

变速恒频双馈风力发电系统通常采用磁链定向、转子磁链定向和气隙磁场定向进行控制,这些控制系统的结构设计复杂,控制精度不高。为了进一步提高风力发电系统的控制效果,论文对变速恒频双馈风力发电系统的双P W M变流器进行了详细的分析,针对网侧变流器建立了数学模型,对网侧变流器的控制策略进行了研究,并采用电压、电流双闭环控制策略对系统中的网侧变流器进行控制。仿真结果显示,双闭环控制策略系统经过短暂的振荡之后能够快速实现状态的转变,达到预期效果。

Variable speed constant-frequency （VSCF） doubly-fed wind power generator system usually adopts the flux orientation, rotor flux orientation and air gap magnetic field oriented to control. The control system structure is complex and the control precision is not high. In order to further improve the control effect of wind power system, thesis for VSCF doubly-fed wind power generation system with dual PWM converter is analyzed in detail and mathematical model is established for the grid-side converter. The control strategy for the grid-side converter is studied, and the grid-side side converter is controlled by double closed loop control strategy of voltage and current feedback. The simulation results show, double closed-loop control strategy after a transient oscillation can realize the change of state and achieve the desired effect.