一种改进的单相整流器控制策略研究

针对传统的基于低通滤波器的单相锁相环带来的网侧电压幅值衰减和相位滞后问题,提出了一种带通滤波器锁相环控制策略,基于带通滤波器对输入信号幅值无衰减和相位保持的特性,在所设定条件下该方法能够无延迟地提取出网侧电压的基波,并保持基波电压的幅值不变。针对电流环比例谐振控制器因带宽小,在电网频率偏移时带来功率因数下降的问题,采用了一种改进的比例谐振控制器。该控制器增加了带宽,具备零稳态误差和消除电网电压扰动影响的能力,能够减小电网频率偏移对系统的影响。最后,仿真和实验验证了所提出的基于带通滤波器锁相环控制策略和经过改进的比例谐振控制器方法的有效性和正确性。

Improved control strategy of single phase rectifier

The problems of traditional single-PLL are that the voltage amplitude decline and phase lag from the line side .To solve the problem ,a control strategy of band pass filter PLL based on the character-istics of amplitude no-attenuation and phase no-lag for input signal was proposed .The fundamental voltage was extracted without delay and the voltage amplitude kept constant with the given method .The problem of proportional-resonant controller of current loop is power factor decline with the grid frequency deviation due to the narrow bandwidth .An improved control strategy which realizes zero steady-state error and elim-inates the influence of grid voltage disturbance was proposed to expand the bandwidth and reduce the im -pact on the system due to the grid frequency deviation .The validity and feasibility of proposed control scheme were verified through simulation and experiment results .