逆变器占空比的通解

General Solution of the Inverter Duty Cycle

基于前人对载波调制方法(Carrier PWM)和空间矢量调制方法(SVPWM)二者统一性的研究,从逆变器的调制方程出发,提出了逆变器的占空比通解形式。作为通解的具体应用,设计了一种使逆变器开关动作次数最少的调制策略,并与传统的开关频率优化PWM(SFOPWM)进行类比,从理论和实验方面证明所提出的占空比通解的正确性与可行性。最后,给出了输出线电压含负序分量的仿真结果以及含三次谐波分量的实验结果,进一步证明了提出的通解形式其良好的应用性。

Based on the previous study on the unity of Carrier PWM and SVPWM and from the start of theinverter modulation equation,a form of general solution of duty cycle had been proposed. And as a specificapplication of the general solution,a modulation strategy which makes the switching frequency of inverter least hadbeen designed. And compared with SFOPWM,the correctness and feasibility of the general solution of duty cycle hadbeen demonstrated from the theoretical and experimental. At last,the simulation results of output line voltage withnegative sequence components and experimental results of the voltage with third harmonic components have beengiven in order to further prove the general solution proposed with good applicability.