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A current control method for open-winding permanent magnet motors based on finite state prediction

A finite state, current control technology, applied in the direction of motor control, motor generator control, AC motor control, etc., can solve the problems of complex structure, extra space voltage vector modulation, etc., to simplify the system structure, achieve suppression, and enhance reliability sexual effect

Active Publication Date: 2019-05-03
TIANJIN SAIXIANG M&E ENG CO LTD
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Problems solved by technology

[0005] The present invention provides a current control method of an open-winding permanent magnet motor based on finite state prediction. The present invention overcomes the shortcomings of the traditional open-winding permanent magnet motor vector control method with complex structure and the need for additional space voltage vector modulation links. See the following description for details:

Method used

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  • A current control method for open-winding permanent magnet motors based on finite state prediction
  • A current control method for open-winding permanent magnet motors based on finite state prediction
  • A current control method for open-winding permanent magnet motors based on finite state prediction

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Embodiment 1

[0027] A current control method for open-winding permanent magnet motors based on finite state prediction. This method applies the finite state predictive control method to the control of open-winding permanent magnet motor drive systems, and realizes the current control of open-winding permanent magnet motor drive systems. At the same time, taking into account the suppression of common mode voltage, see figure 1 , the control method includes the following steps:

[0028] 101: Double closed-loop control is adopted. The speed outer loop controller is composed of a state space controller with one degree of freedom. The current reference value is generated through the state space controller. The current inner loop controller is the core of this method. The current inner loop control The controller uses a finite state model predictive controller;

[0029] In actual implementation, the speed outer loop controller and the current inner loop controller work together to generate a to...

Embodiment 2

[0034] Combined with the specific calculation formula, Table 1, Figure 2-Figure 4 The scheme in embodiment 1 is further introduced, see the following description for details:

[0035] Table 1 The space voltage vector u synthesized under different switch combinations when the converter supplies power s and its corresponding common-mode voltage amplitude

[0036]

[0037] figure 1 Shown is a block diagram of the model predictive control of an open-winding permanent magnet motor. The entire open-winding permanent magnet motor drive system is composed of a speed loop and a current loop. The speed loop adopts a space state controller with one degree of freedom, and the reference current signal i is generated from the speed error signal q,ref , i d,ref is given externally. The inner loop current loop controller adopts the finite state predictive controller, selects the optimal switch combination for the system through the system evaluation function, realizes the control of ...

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Abstract

The invention discloses an open winding permanent magnet motor current control method based on limited state prediction. The open winding permanent magnet motor current control method based on the limited state prediction comprises that: double-closed-loop control is adopted; a speed external ring controller consists of a state space controller having a freedom degree and a current reference value is generated; a current internal ring controller adopts a limited state model prediction controller and generates sixty-four switch combinations during power supplying; the limited state model prediction controller predicts a current perdition value corresponding to a next moment under an act of each switch combination according to a motor discrete mathematical model; an evaluation function of a switch function which is only constituted by a current error item and a common mode voltage suppression term; a switch combination which makes the evaluation function value smallest as an optimal switch combination to act on a system to realize current control while common mode voltage is suppresed. The open winding permanent magnet motor current control method based on limited state prediction overcomes a problem that a traditional open winding permanent magnetic motor vector control method is complex in structure and needs an extra space voltage vector regulation link.

Description

technical field [0001] The invention relates to the field of current control of open-winding permanent magnet motors, in particular to a current control method of open-winding permanent magnet motors based on finite state prediction. Background technique [0002] The open-winding motor opens the neutral point of the traditional three-phase AC motor to form an open winding structure with two ports. The magnetic circuit and structure of the motor do not change. After the neutral point is opened, the constraint relationship between the motor windings of each phase no longer exists, and the windings of each phase are independent, which can improve the reliability of the motor body and the fault tolerance of the motor drive system to a certain extent. The two ports of the open-winding motor can be connected to the converters separately. Through the coordinated control of the converters at the two ports, each converter can bear half of the power, which better meets the needs of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/02H02P21/22
CPCH02P21/22H02P25/02H02P2205/01H02P2205/07
Inventor 宋战锋张志朋陈炜
Owner TIANJIN SAIXIANG M&E ENG CO LTD
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