三电平PWM整流器平衡控制技术的研究

Study on the Control Technology of Neutral-Point Voltage Balance for Three-level PWM Rectifier

研究三电平PWM整流器平衡控制方法。在三电平PWM整流器应用过程中,假设受到较强的外界干扰,将造成输出的波形稳定性较差,不能保持平稳的输出波形,降低了输出波形的真实性。为此,提出了一种基于瞬时功率控制算法的三电平PWM整流器平衡控制方法。利用瞬时功率控制方法,对三电平PWM整流器进行平衡控制。利用小波变换方法,对输出的波形进行滤波处理,从而对三电平PWM整流器平衡控制的误差进行补偿。实验结果表明,利用本文算法进行三电平PWM整流器的平衡控制,能够提高控制的准确性,取得了令人满意的效果。

The three-level PWM rectifier balance control method. In the process of the three-level PWM rectifier application, assuming under strong interference, will cause the output waveform of the stability is bad, can＇t keep sta- ble output waveform, reduce the authenticity of the output waveform. For this, put forward a three level PWM rectifier based on instantaneous power control algorithm balance control method. Using instantaneous power control method of three-level PWM rectifier control the balance. Using wavelet transform method, the output waveform filter process- ing, error between the balance of three level PWM rectifier control to compensate. The experimental results show that the algorithm presented in this paper for the balance of the three-level PWM rectifier control, can improve the accura- cy of control, satisfactory results have been achieved.