Current Trajectory Search Method and Online Control Method for Optimal Control of Efficiency in Full Speed ​​Domain 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 full-speed domain efficiency, and achieve a high computational cost. Small, achieve the effect of optimal online control of full-speed domain efficiency, and fast iterative convergence speed

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 of full-speed domain efficiency uses fixed parameter values ​​for calculation, and there is a large deviation of the current trajectory, which cannot realize accurate optimal control of full-speed domain efficiency, and provides a full-speed domain of permanent magnet synchronous motor Efficiency 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 Efficiency in Full Speed ​​Domain of Permanent Magnet Synchronous Motor
  • Current Trajectory Search Method and Online Control Method for Optimal Control of Efficiency in Full Speed ​​Domain of Permanent Magnet Synchronous Motor
  • Current Trajectory Search Method and Online Control Method for Optimal Control of Efficiency in Full Speed ​​Domain of Permanent Magnet Synchronous Motor

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specific Embodiment approach 1

[0098] Specific embodiment one: the following combination Figure 1 to Figure 5 This embodiment will be described. The current trajectory search method for the optimal control of the efficiency of the permanent magnet synchronous motor in the full speed domain described in this embodiment, when the motor is running below the base speed value, under the given torque command, speed command, voltage limit, and current limit Under the MTPA control method, the current operating point with the smallest current amplitude is obtained as the current trajectory; when the motor runs above the base speed value, under the given torque command, speed command, voltage limit, and current limit, the field weakening area efficiency is adopted. The optimal control method obtains the current operating point with the smallest current amplitude as the current trajectory;

[0099] The process of using the MTPA control method to obtain the current operating point with the smallest current amplitude i...

specific Embodiment approach 2

[0233] Specific embodiment two: the following combination Figure 1 to Figure 6 The present embodiment will be described, and the online control method for the full-speed domain efficiency optimal control of the permanent magnet synchronous motor described in the present embodiment will be described.

[0234] The search method described in Embodiment 1 is used to obtain the current trajectories of the permanent magnet synchronous motor at a series of operating points under different magnetization states, and these current trajectories are used as sample data to train, test and verify the neural network model. The input of the neural network model for optimal control of efficiency in the full speed domain is the speed, torque, voltage limit and current limit of the motor, and the output is the current amplitude and current angle (or direct-axis current and quadrature-axis current). The gradient of the error between the output value and the sample value adjusts the weight and bi...

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Abstract

The invention relates to a current trajectory search method and an on-line control method for the full-speed domain efficiency optimal control of a permanent magnet synchronous motor, belonging to the field of electric motors. The invention uses fixed parameter values ​​to calculate the traditional full-speed domain efficiency optimal control algorithm, which has a large deviation of the current trajectory and cannot be realized. Accurate full-speed domain efficiency optimal control problem. The method of the present invention is as follows: when the motor is running below the base speed value, under the given torque command, rotational speed command, voltage limit and current limit, the current operating point with the smallest current amplitude is obtained by MTPA control mode as the current trajectory; When the motor runs above the base speed value, under the given torque command, speed command, voltage limit, and current limit, the optimal control method of the field weakening area efficiency is adopted to obtain the current operating point with the smallest current amplitude as the current trajectory.

Description

technical field [0001] The invention relates to a current trajectory search algorithm when the efficiency of the permanent magnet synchronous motor is optimally controlled in the full speed domain, a nonlinear flux linkage model of the permanent magnet synchronous motor, and a neural network-based optimal online efficiency of the permanent magnet synchronous motor in the full speed domain. 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
CPCH02P6/34H02P21/14H02P21/141H02P21/20H02P21/22H02P21/0014H02P21/0089H02P25/022H02P2207/05Y02T10/72
Inventor 郑萍尹佐生乔光远刘国鹏苑子航
Owner HARBIN INST OF TECH
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