基于PI-SMC的风力发电变换器优化控制

Optimal Control of Wind Power Converter Based on PI-SMC

针对双馈风力发电机传统矢量控制时存在的参数不易调节、自适应差和鲁棒性不足的问题,从风速突变对系统的影响和降低系统充电回路的故障率出发,通过分析机侧变换器和网侧变换器的数学模型,提出了一种基于PI-SMC的控制器。控制系统将PI电压控制和双幂次指数趋近率滑模电流控制相结合,得到一种新的抑制双馈风力发电机直流母线电压波动的控制器,并与双闭环PI控制方法进行了仿真对比验证。结果表明,基于PI-SMC的控制方法明显提高了直流母线电压抗扰动能力,增强了控制精度和平滑性。

Aiming at the problems of difficult-to-adjust parameters,poor self-adaptation,and insufficient robustness in the traditional vector control of doubly-fed wind turbines,this paper starts from the impact of sudden changes in wind speed on the system and reduces the failure rate of the system s charging circuit.The mathematical model of the converter and grid-side converter proposed a PI-SMC based controller.The control system combines PI voltage control and double-power exponential approach rate sliding mode current control to obtain a new controller that suppresses the DC bus voltage fluctuation of doubly-fed wind turbine generators.The simulation results are compared with those of double closed-loop PI control method.The results show that the PI-SMC-based control method significantly improves the anti-disturbance capability of the DC bus voltage,and enhances the control accuracy and smoothness.