Series compensation vector control method for open-winding permanent magnet synchronous motor

Abstract

The invention discloses an open winding permanent magnet synchronous motor series compensation vector control system which is composed of a direct-current power source, a main converter powered by the direct-current power source, an open winding permanent magnet synchronous motor, a compensation converter powered by a power supply capacitor, voltage sensors arranged at the two ends of the power supply capacitor, a current sensor arranged on the stator side of the open winding permanent magnet synchronous motor, a speed sensor arranged on a rotation shaft of the open winding permanent magnet synchronous motor, and a controller controlling the main converter and the compensation converter. According to the open winding permanent magnet synchronous motor series compensation vector control system, the compensation converter which is arranged at the stator tail end of the open winding permanent magnet synchronous motor and powered by the power supply capacitor is controlled to equivalently change stator winding impedance, so that the power factor of the main converter approaches to or reaches 1; through cooperation control over the main converter and the compensation converter, distribution of active power and reactive power is changed, performance of the motor is improved, a flux weakening control area of the permanent magnet synchronous motor is expanded, and the operation range is widened.

Description

technical field [0001] The invention relates to a control system of a permanent magnet synchronous motor, in particular to a series compensation vector control system and a control method of an open-winding permanent magnet synchronous motor. Background technique [0002] Due to its unique advantages in terms of efficiency, power density, volume and weight, permanent magnet motors have become the preferred solution for motor bodies in modern electric traction systems. However, due to the use of permanent magnets for excitation, permanent magnet motors have the problems of difficulty in increasing speed due to weak magnetic field and narrow operating range. In order to make it better applied in electric traction occasions such as electric vehicles and electric ships, the conventional method is to improve the design of the motor body. The improvement scheme can achieve the purpose of adjusting the magnetic field of the motor to a certain extent, but at the same time This lead...

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Problems solved by technology

[0005] Aiming at the problem that the operating range of the conventional permanent magnet synchronous motor system is small and the control performance is not high enough under the condition of limited power supply, the present invention provides an open-winding permanent magnet synchronous motor series compensation vector control system and a control method. The present invention realizes the limited power supply Improvement of the operating range and operating performance of permanent magnet synchronous motors under

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