基于IGBT有源逆变的内反馈串级调速系统的研究

Speed regulation system using cascade control method with thyristor is a low-cost system, but the classic system has some shortages, such as a low power factor, serious harmonic pollution etc. Though power factor can be improved when chopper technique is adopted, the problem is not changed from essence. The application of IGBT substitute SCR in inverter bridge can not only reduce the harmonic, but also provide the capacitive reactive power with power grid to equalize inductive reactive power to improve the power factor. SPWM direct current control strategy is introduced in the paper. According to the simulation of three-phase voltage source inverter and the application of inverter in internal feedback cascade control system, the proposed scheme is verified efficiently and feasibly.