双馈风力发电机网侧PWM变换器控制系统设计

Design of DFIG grid-side PWM converter control system

为保证双馈风力发电机组中网侧变换器直流环节电压的稳定及功率因数可调,以TMS320F2812 DSP为控制核心,利用智能功率模块及其驱动电路、直流电容等器件建立交-直-交双PWM变换器.通过对网侧PWM变换器在两相同步旋转d-q坐标系下数学模型的分析,确定基于电网电压定向及前馈解耦的控制策略,并详细给出了PI参数具体计算公式.研究结果表明:在不同工况下保证系统运行过程中直流环节电压的稳定、功率因数可调及变换器可以实现能量的双向流动,验证了系统控制策略及调节器参数计算方法的可行性.

In order to ensure the stability of the DC-link voltage of the grid side converter and the power factor adjustable in the wind turbine generator system, this paper used the IPM and its drive circuit the DC capacitors and other components,and built the AC-DC-AC double PWM converter. By analyzing mathematical model of two-phase synchronous rotating d-q coordinate system, this paper determined the control strategies in grid voltage oriented and feedforward decoupling, and provided the PI parameters formula in details. The results of study show that under the different working conditions, the design ensures the stability of the DC-link voltage and power factor adjustable during operation and Two-way flow of the converter＇s energy. The feasibility of control system design and the PI regulator parameters design method is verified.