具有低电压穿越能力的Quasi-Z源间接矩阵变换器电机驱动控制系统

The Quasi-Z source indirect matrix converter(QZS-IMC)has high voltage gain and strong ability against interference, especially has low voltage ride through capability at grid voltage drop. First of all, operational principle of the QZS-IMC was analyzed and its mathematical model was built.Then, the QZS-IMC was applied to motor drive and a QZS-IMC based induction motor drive system with low voltage ride through capability was proposed. The proposed motor drive can automatically adjust voltage boost ratio of the converter to maintain constant output voltage when grid voltage drops so that the motor operation was not affected.In addition, the proposed motor drive system maximally utilizes modulation index of inverter stage.Motor speed adjustment was achieved by tuning shoot-through duty cycle and modulation index of rectifier stage to lower power loss of the QZS-IMC.Simulation and experimental tests are carried out on the proposed QZS-IMC motor drive system.The test results verify that the proposed motor drive system has excellent performance in low voltage ride through capability and shows high efficiency during operation.