This paper describes the control of the Quasi-Z-Source-Inverter (QZSI), feeding a three phase Interior-Permanent-Magnet-Synchronous-Machine (IPMSM) for an electric vehicle application. A small signal model of the QZSI and a model of the IPMSM are established with an according control strategy, implemented in a Digital Signal Processing system. Moreover, a simple and effective method of feedforward compensation for the QZSI current controller is worked out. It is shown, that the utilized Shoot-Through states for boost operation have remarkable impact on the control of the IPMSM in the full modulation operating region. The properties of the control system and the effectiveness of the control strategy are verified by experimental results.
Control and dynamic performance of the Quasi-Z-Source-Inverter feeding an Interior-Permanent-Magnet-Synchronous-Machine
International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2014