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Current trajectory search method and online control method for optimal control of field weakening region efficiency of permanent magnet synchronous motor

A permanent magnet synchronous motor, optimal control technology, applied in motor control, motor generator control, control of electromechanical brakes, etc., can solve problems such as large current trajectory deviation, inability to achieve optimal control of field weakening area efficiency, etc. Small, achieve the effect of optimal on-line control of field-weakening area efficiency, and accurate optimal control of field-weakening area efficiency

Active Publication Date: 2022-07-12
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional optimal control algorithm for the efficiency of the field weakening area uses fixed parameter values ​​for calculation, and there is a large deviation of the current trajectory, which makes it impossible to realize the optimal control of the efficiency of the field weakening area accurately. Optimal Control Current Trajectory Search Method and Online Control Method

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  • Current trajectory search method and online control method for optimal control of field weakening region efficiency of permanent magnet synchronous motor
  • Current trajectory search method and online control method for optimal control of field weakening region efficiency of permanent magnet synchronous motor
  • Current trajectory search method and online control method for optimal control of field weakening region efficiency of permanent magnet synchronous motor

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specific Embodiment approach 1

[0065] Specific embodiment one: the following combination Figure 1 to Figure 4 This embodiment is described. The method for searching the current trajectory for optimal control of field weakening region efficiency of a permanent magnet synchronous motor in this embodiment includes a field weakening current angle iteration loop step and a current amplitude iteration loop step. See figure 2 As shown, the current amplitude objective function value I(λ k ), I(β k ) and the load voltage objective function value U(λ k ), U(β k ) is obtained by calling the current amplitude iterative loop, k=1,2,3...that is, the objective function value that needs to be obtained by calling the current amplitude iterative loop is I(λ 1 ), I(β 1 ), U(λ 1 ), U(β 1 ); I(λ 2 ), I(β 2 ), U(λ 2 ), U(β 2 ); I(λ 3 ), I(β 3 ), U(λ 3 ), U(β 3 )…, the parameter output to the current amplitude iteration loop is the current angle test point λ k , β k , when k=1, θ=λ 1 and beta 1 Two values, it ...

specific Embodiment approach 2

[0141] Specific embodiment two: the following combination Figure 1 to Figure 5 This embodiment will be described, and the optimal online control method for the field weakening region efficiency of a permanent magnet synchronous motor described in this embodiment.

[0142] Use the search method described in Embodiment 1 to obtain the current trajectories of the permanent magnet synchronous motor at a series of operating points with the smallest current amplitude, and use these current trajectories as sample data to train, test and verify the neural network model. When the error is less than After setting the value, the training is completed, the neural network structure and the weight and bias parameters of each neuron are determined. Figure 5As shown, the model can not only output the current traces of the corresponding operating points in the sample data, but also output the current traces of the operating points outside the sample data, that is, the current traces of all o...

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Abstract

The invention relates to a current trajectory search method and an on-line control method for optimal control of field-weakening region efficiency of a permanent magnet synchronous motor, belonging to the field of electric motors. The present invention uses fixed parameter values ​​to calculate the traditional optimal control algorithm for field-weakening region efficiency, and there is a large deviation of the current trajectory, which cannot be accurately achieved. The problem of optimal control of the field-weakening region efficiency. The method of the invention is as follows: under the given torque command, rotational speed command, voltage limit and current limit, the current operating point with the smallest current amplitude is obtained as the optimal control current trajectory of the field weakening area efficiency; the method includes the field weakening current angle iteration and the current amplitude iteration, firstly, the field-weakening current angle iteration is performed, and the iteration direction is the direction in which the current amplitude decreases under the voltage limit; in the iteration process, the current amplitude iteration is nested to determine the current corresponding to each current angle. Amplitude, the iterative direction is the direction in which the error between the given torque and the actual torque decreases. After the iteration converges, the optimal control current trajectory of the field weakening region efficiency is output.

Description

technical field [0001] The invention relates to a current trajectory search algorithm when the efficiency of the field weakening region of a permanent magnet synchronous motor is optimally controlled, a nonlinear flux linkage model of the permanent magnet synchronous motor, and a neural network-based optimal online field-weakening region efficiency of the permanent magnet synchronous motor A control algorithm belongs to the field of motors. Background technique [0002] In recent years, the number of traditional automobiles has surged, resulting in increasingly serious environmental pollution problems, and has gradually become one of the important factors aggravating global warming and the greenhouse effect. At the same time, traditional automobiles use internal combustion engines, which have a low energy conversion rate and are very dependent on non-renewable resources such as oil. The dual pressures of environmental pollution and energy crisis have prompted the traditional...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/34H02P21/14H02P21/20H02P21/22H02P25/022
CPCH02P6/34H02P21/14H02P21/141H02P21/20H02P21/22H02P21/0014H02P25/022H02P21/0089H02P2207/05Y02T10/72
Inventor 郑萍王明峤乔光远刘家琦郎杰文
Owner HARBIN INST OF TECH
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