中压电机驱动用功率变换器设计与实现探索

After several decades of technological evolution, multilevel and multi-pulse converters have become extremely important for medium voltage drive systems. However, reducing circuit complexity in a multilevel converter is still challenging. Hence, a five-level multilevel converter is exhibited in this paper. Exhibited power inverter is a resultant structure of a series connection of level generation cells with H-bridge. Exhibited multilevel converter generates five-step voltage per phase and nine–level step voltage at motor terminals. In existing converters, the number of power switches is decreased from twenty-four to twenty-one in proposed converter to obtain efficient operations. In the proposed inverter, level generation cell switch operates with the PWM technique, whereas the bridge switch operates at fundamental switching frequency, which reduces the power losses of the system and enhances efficiency. In the medium voltage drive system, a multi pulse converter is a practical converter that provides DC power for drive end power converter and overcomes harmonics impact at grid terminal of medium voltage drive. As a result, a 36-pulse AC-DC converter is used to enhance power quality at grid side of the medium voltage drive system. An analysis encompasses system design, simulation response (at MV level motor power range), and steady& dynamic study response. In addition, it will shown that the proposed medium voltage drive system cost and footprint requirements are less than the available medium voltage drive system. This paper uses an indirect field-oriented control method to stabilize motor operation during steady and dynamic conditions. Effectiveness of 415V-7.5kW motor. The results highlight the advantages of the 36-pulse multi-pulse converter and five-level multi-level inverter, which offers increased power density, improved waveform quality with reduced total harmonic distortion (THD), enhanced overall system efficiency, and reduced number of components count.