A multi-phase permanent magnet synchronous motor drive system and its control method

Abstract

The invention discloses a driving system for a multiphase permanent magnet synchronous motor and a control method of the driving system. The driving system comprises a modular multilevel converter, wherein the modular multilevel converter consists of three phases and six bridge arms; each bridge arm consists of n submodules and one filter inductor; each submodule consists of a PWM (Pulse-Width Modulation) inverter, two IGBTs (Insulated Gate Bipolar Transistor) and one capacitor; the two IGBTs are serially connected and then are connected with the corresponding capacitor and a direct current side of the corresponding PWM inverter in parallel; an alternating current side of each PWM inverter is connected with one set of three-phase winding of the multiphase permanent magnet synchronous motor; the number of the three-phase winding of the multiphase permanent magnet synchronous motor is 6n (n is 1, 2, 3 and the like). According to the driving system and the control method disclosed by the invention, three-phase branches are subjected to modular series-parallel connection, all the sets of three-phase winding of the multiphase permanent magnet synchronous motor are respectively controlled, the problem that the multiphase permanent magnet synchronous motor is difficult to control in a multidimensional manner is solved, and low-voltage, heavy-power and high-reliability driving of the multiphase permanent magnet synchronous motor can be realized.

Description

Technical field [0001] The invention belongs to the technical field of high-power permanent magnet synchronous motor drive technology, and particularly relates to a multi-phase permanent magnet synchronous motor drive system and a control method thereof. Background technique [0002] High-speed and high-power motors have the advantages of small size, high power density, can be directly connected to high-speed loads, eliminating traditional mechanical speed-increasing devices, reducing system noise and improving system transmission efficiency. It has broad application prospects in the fields of high-speed grinders, air cycle refrigeration systems, energy storage flywheels, high-speed centrifugal compressors for natural gas transmission, shipboard electric propulsion systems, and distributed power generation systems as aircraft power supply equipment. [0003] Foreign countries started relatively early in the field of high-speed and large-capacity motors, and the technology is relati...

AI Technical Summary

Problems solved by technology

The low reliability of the motor system seriously threatens the overall performance of major equipment, leading to catastrophic accidents

[0007] 2) At present, the conventional high-voltage drive treats the motor, frequency converter, and controller separately as isolated objects, without the integrated design of the motor-converter-controller, and the optimal combination of each link of the system cannot be realized, which hinders system integration;

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