Electrolytic-free capacitor power converter and control method for permanent magnet synchronous motor drive system

Abstract

A non-electrolytic capacitor power converter and control method for driving system of permanent magnet synchronous motor are disclosed, An output positive electrode of the single-phase rectifier circuit is connected with an anode of the first diode, an output negative electrode is connected with a negative electrode of the first thin film capacitor, a second switch tube emitter, a second thin filmcapacitor negative electrode, an input negative electrode of the three-phase inverter circuit, and an emitter of the first switch tube is connected with an inductance terminal and a cathode of the first diode. A collector of the first switch tube and a positive electrode of the first thin film capacitor, second diode cathode connection, A collector of the second switch tube is connected to the other end of the inductor L, simultaneously connected to the anode of the second diode and the anode of the third diode, The cathode of the third diode is connected with the collector of the third switch tube, and the emitter of the third switch tube is connected with the cathode of the second film capacitor, and is connected with the input cathode of the three-phase inverter circuit, which can effectively solve the problems of serious DC bus voltage fluctuation and poor static and dynamic performance of the existing electrolytic capacitance motor drive system.

Description

technical field [0001] The invention belongs to the technical field of power electronic control, and in particular relates to an electrolytic capacitor power converter and a control method for a permanent magnet synchronous motor drive system. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnetic Synchronous Machine, PMSM) has the advantages of simple structure, high power density, and convenient maintenance. It has gradually replaced DC motors and asynchronous motors in industrial applications, household appliances, and automobile drives. This type of motor drive system requires large-capacity electrolytic capacitors to maintain the stability of the DC bus voltage and provide working conditions for the high-performance operation of the motor. However, electrolytic capacitors have disadvantages such as short life, low reliability, and poor thermal stability, which are the main cause of failure in motor drive systems. In order to improve th...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a non-electrolytic capacitor power converter for permanent magnet synchronous motors and its control method, which can effectively suppress the fluctuation of the DC bus voltage and have high input power factor,

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