Study on Integrated Control Strategy of Dual-PWM Converter Based on Load Current Feed-Forward

Aiming at the dual PWM frequency converter with rectifier and inverter side independently controlled, expensive bulky capacitance must be added to the DC side to keep the voltage stable, which will increasing the cost and reducing the life of the entire system, a dual PWM variable frequency speed regulation system which the rectifier side adopts dual-close-loop control using current inner loop and voltage outer loop, and the inverter side adopts the rotor magnetic field orientation vector control with SVPWM technology was proposed in this paper, and use load current feed forward control strategy to achieve the coordinated control of dual PWM converter by means of making load current feed forward to net side. The obtained simulation results indicate that compared with the independently controlled dual PWM variable frequency speed regulation system, the integrated coordinated control strategy of dual PWM variable frequency speed regulation system can not only reduce the harmonic of the network side current, but also inhibit the fluctuation of DC voltage during the load mutation, accelerate the dynamic response of the rectifying side and the inverter side, greatly improve the resisting disturbance ability of the system, thus reduce the capacity volume and reduce the cost.