级联H桥变流器的波动电压生成控制策略

Control Strategy for Fluctuating Voltage Generation in Cascaded H Bridge Converters

提出一种针对级联H桥变流器的新型波动有效值反馈控制策略,它以输出电压滑动窗有效值为反馈量,以波动信号滑动窗有效值为参考量,对输出电压进行控制。对波动电压控制策略进行建模与分析,并给出一种参数设计方法。最后,在"35 k V-6 MW"样机上进行的工业现场实验充分验证了所提出控制方法的有效性和可行性。根据现场实验结果,波动电压的幅值相对误差可达到2%以下。

This paper presents a novel fluctuating rms value feedback control( FRFC) for the cascaded Hbridge( CHB) converter,which uses the output voltage sliding window rms value as the feedback variable and the fluctuating signal sliding window rms value as the reference for voltage control. The proposed strategy can easily set the controller parameter,has high accuracy in the output voltage fluctuation and frequency,and is suitable for high voltage and power applications in real industry. Modeling and analysis of the FRFC is elaborated in this paper. A parameter design method is proposed as well. Finally, the field experimental results on the35 k V-6 MW wind turbine testing prototype sufficiently verify the feasibility and effectiveness of the proposed FRFC. According to the experimental results,the relative error of the fluctuating output voltage is less than 2%by utilizing the proposed FRFC.