基于波形变换的超低频正弦电源控制策略研究

Research on Control Strategy of Ultra-low Frequency Sinusoidal Power Supply Based on Waveform Transformation

这里提出一种基于二阶广义积分器(SOGI)锁相环波形变换与准比例谐振(QPR)+比例积分(PI)双环控制的超低频正弦全波脉动控制策略,能消除静态误差和零点漂移,并提高波形正弦度。基于此,这里首先设计了单桥臂的低频直流脉动电路拓扑,能够实现能量可逆流动,为输出波形的直流脉动变换提供有利条件;其次,通过SOGI锁相环进行波形变换,将超低频正弦全波脉动直流信号变换为超低频正弦交流信号,使直流控制转换为交流控制,并结合QPR+PI双环控制,实现了系统的无静态误差控制,且提高了系统的动态性能。最后,通过仿真和实验证明了控制策略的可行性和有效性。

An ultra-low frequency sinusoidal full wave pulsation control strategy based on second-order generalized integrator(SOGI)phase-locked loop waveform transformation and quasi proportional resonat(QPR)+proportional integral(PI)double loop control is proposed,which can eliminate static error and zero drift,and improve waveform sinusoidity.Based on this,the low-frequency direct current pulsation circuit topology of single bridge arm is designed,which can realize the reversible flow of energy and provide favorable conditions for direct current pulsation conversion of output waveform.Secondly,the SOCI phase-locked loop is used to transform the waveform,convert the ultra-low frequency sinusoidal full wave pulsation direct current signal into the ultra-low frequency sinusoidal alternating current signal,and convert the direct current control into the alternating current control.Combined with the QPR+PI double loop control,the static error free control of the system is realized,and the dynamic performance of the system is improved.Finally,the feasibility and effectiveness of the control strategy are proved by simulation and experiment.