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Control method for suppressing current zero-crossing fluctuation of bus-shared single-side controllable open-winding permanent-magnet motor system

A technology of permanent magnet motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control system, etc., and can solve the problems of increasing diode switching loss and the like

Active Publication Date: 2015-08-19
安徽华辰磁控科技有限公司
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Problems solved by technology

This zero-crossing fluctuation phenomenon will cause the diode to be turned on and off continuously, which will increase the switching loss of the diode to a certain extent, and will also bring great electromagnetic interference (EMI) to the entire system.

Method used

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  • Control method for suppressing current zero-crossing fluctuation of bus-shared single-side controllable open-winding permanent-magnet motor system
  • Control method for suppressing current zero-crossing fluctuation of bus-shared single-side controllable open-winding permanent-magnet motor system
  • Control method for suppressing current zero-crossing fluctuation of bus-shared single-side controllable open-winding permanent-magnet motor system

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Embodiment Construction

[0066] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0067] like figure 2 As shown, the present invention is based on a unilaterally controllable common DC bus open-winding permanent magnet motor system, including: a permanent magnet motor, a fully-controlled converter J1, an uncontrolled converter J2, and a permanent magnet motor. DC power supply S and a controller; among them, the permanent magnet motor has three-phase windings and is an open-winding structure; the converter J1 adopts a three-phase controllable full-bridge rectifier, and the converter J2 adopts a three-phase uncontrolled full-bridge rectifier , the DC sides of the converters J1 and J2 share the same DC power supply, and there is a bus capacitor C on the DC power supply. Each bridge arm is composed of at least one power electronic switchi...

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Abstract

The invention discloses a control method for suppressing current zero-crossing fluctuation of a bus-shared single-side controllable open-winding permanent-magnet motor system. The motor system employs a common-direct-current power supply structure. A proper zero-sequence current reference value is designed and a proportional resonance controller is used to achieve an objective rapid zero crossing of the current. The system employs a full-control converter and an uncontrolled converter, so that the cost is reduced and the system capacity is increased; only one direct-current power supply is involved in the system and no isolation is needed, thereby realizing rapid zero crossing of the current. Only the control algorithm us changed and no system hardware cost needs to be increased. Compared with the traditional control method, the current zero-crossing fluctuation is reduced; the number of times of switching of the power diode is reduced; and the system EMI is also reduced. The control method is simple; and the anti-interference capability is high.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a control method for suppressing current zero-crossing fluctuations of a common busbar unilaterally controllable open-winding permanent magnet motor system. Background technique [0002] As a clean and renewable energy, wind energy has been highly valued by countries all over the world in recent years. The wind energy reserves are huge, and the global wind power generation has maintained rapid and continuous growth for many years. Due to the emergence of permanent magnet materials with high magnetic energy density such as AlNiCo, ferrite and NdFeB, permanent magnet motors have achieved unprecedented development and growth. Permanent magnet direct-drive wind turbines have gradually developed into the mainstream models in major wind farms due to their advantages such as high reliability, simple structure, low maintenance cost, and strong adaptability to grid conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 年珩周义杰
Owner 安徽华辰磁控科技有限公司
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