Apparatus and method for damping resonant voltage on the LC filter of PWM inverter

摘要

disclosure relates to a device and a method of suppressing the resonance voltage of the PWM inverter output LC filter, LC filter the 3/2 phase coordinate conversion unit configured to convert the two-phase synchronous speed coordinate value of the three-phase capacitor voltage; 3/2 on the d-axis synchronous speed differential coordinate transformation coordinate values after conversion through the inductor / resistor braking and virtual d-axis equivalent circuit to calculate the d-axis equivalent virtual braking resistor voltage multiplied by the value of the braking resistor; 3/2 on the q-axis synchronous speed differential coordinate transformation coordinate values after conversion through the inductor / and q-axis virtual braking resistor to calculate the q-axis equivalent circuit braking resistor virtual equivalent voltage multiplied by the value of the braking resistor; Performing the vector control loop after subtracting the d-axis virtual braking resistance equivalent calculated in the d-axis voltage virtual braking resistance equivalent circuit in a d-axis reference voltage outputted by a first and a subtracter for outputting a new d-axis reference voltage of the PWM inverter; Performing the vector control loop and a second subtractor for subtracting the reference voltage from the q-axis q-axis virtual braking resistance equivalent calculated in the q-axis voltage virtual braking resistance equivalent circuit for outputting a new q-axis reference voltage of the PWM inverter output; The configuration of claim 1, 2 d-axis voltage and the q-axis based on the reference voltage outputted from the subtractor including a 2/3 phase coordinate conversion for converting the reference voltage on the 3. ; Thus, the present invention can be substantially attenuated by the resonance voltage of the LC filter, as well as it is possible to prevent reduction in the system efficiency due to the loss of resistance due to the actual braking and resistance, a vector controlled alternating current motor drive system, the effects that can be easily applied and UPS provides.