Improved deadbeat predictive control method for permanent magnet synchronous motor with single current sensor
A permanent magnet synchronous motor and current prediction technology, which is applied in motor control, motor generator control, AC motor control, etc., can solve problems such as complicated current reconstruction, torque fluctuation, and limited system performance, and achieve good control characteristics, Effects of size reduction and cost reduction
Active Publication Date: 2022-04-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
Accurate acquisition of three-phase current is particularly important for these control strategies. The simplest way is to detect the two-phase winding current separately, but due to the difference in DC bias or current gain between different sensors will bring torque to the entire system The increase in fluctuation limits the improvement of system performance
However, due to the non-simultaneity of single current sensor sampling, current reconstruction requires complex algorithms and needs to consider the compensation of the voltage vector
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[0060] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0061] The improved single current sensor deadbeat predictive control method of the permanent magnet synchronous motor provided by the present invention, such as figure 1 As shown, it specifically includes the following steps:
[0062] Step 1. The online data collects the three-phase current i of the permanent magnet synchronous motor at the current k moment in real time a i b i c , rotor speed w, rotor position angle θ;
[0063]Step 2. Establish the mathematical model of the permanent magnet synchronous m...
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The invention provides an improved deadbeat predictive control method for a single current sensor of a permanent magnet synchronous motor. Firstly, the traditional deadbeat predictive control is improved, and the improved deadbeat predictive control can effectively suppress the damage caused by the change of motor parameters. influences. Then the reconstructed phase current based on single current sensor is applied to improve deadbeat predictive control, which reduces the cost and volume of the control system and avoids the measurement error caused by the difference between current sensors. In addition, this control method has a certain inhibitory effect on the parameter changes of the motor.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to single current sensor deadbeat predictive control of a permanent magnet synchronous motor based on a bus current sensor, which is suitable for suppressing parameter disturbances in the case of permanent magnet synchronous motor parameter mismatch. Background technique [0002] In the existing permanent magnet synchronous motor control technology, using traditional control strategies such as PI control, deadbeat model predictive control, etc., the dependence on the system model and motor parameters is very high, and there is an inherent problem of poor robustness of parameters , when the parameters change, the control effect will drop rapidly, which leads to the fact that these control strategies that depend on the model and parameter accuracy cannot meet the requirements of high-performance control, which limits their application range. [0003]...
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IPC IPC(8): H02P21/14H02P21/22H02P21/12H02P6/34H02P25/026H02P27/08
CPCH02P21/14H02P21/22H02P21/12H02P6/34H02P25/026H02P27/08H02P2207/05
Inventor 张承宁李永屾张硕邱锰李雪荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY