A control method for suppressing the current zero-crossing point fluctuation of the common bus unilaterally 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., can solve the problems of increasing diode switching loss and the like
Active Publication Date: 2017-04-12
安徽华辰磁控科技有限公司
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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.
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[0066] In order to describe the present invention in more detail, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0067] Such as figure 2 As shown, the present invention is based on a unilateral controllable common DC bus open-winding permanent magnet motor system, which includes: a permanent magnet motor, a fully controlled converter J1, an uncontrolled converter J2, and a straight Current power supply S and a controller; among them, the permanent magnet motor has a three-phase winding and an open winding structure; the converter J1 uses a three-phase controllable full-bridge rectifier, and the converter J2 uses 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 switching device in series....
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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 specifically relates to a control method for suppressing current zero-crossing point fluctuations of a common bus unilateral controllable open-winding permanent magnet motor system. Background technique [0002] As a clean and renewable energy source, wind energy has been highly valued by countries all over the world in recent years. The reserves of wind energy 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 neodymium iron boron, permanent magnet motors have achieved unprecedented development and growth. Permanent magnet direct-drive wind turbines have gradually developed into mainstream models in major wind farms due to their high reliability, simple structure, low maintenance cost, and strong grid adaptability. [0003] F...
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IPC IPC(8): H02P21/22
Inventor 年珩周义杰
Owner 安徽华辰磁控科技有限公司