Model predictive torque control method for npc three-level converter-pmsm system

A technology for predicting torque and control methods, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of not considering the impact and not being able to directly apply the model predictive torque control algorithm, etc., to achieve improved Effects of control performance, shorter holddown times, and simplified method handling

Active Publication Date: 2021-04-06
ZHEJIANG UNIV
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Problems solved by technology

However, the above methods are all modulation methods, which do not consider the influence of the midpoint voltage offset on the system torque and flux linkage performance, and cannot be directly applied to the model predictive torque control algorithm.

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  • Model predictive torque control method for npc three-level converter-pmsm system
  • Model predictive torque control method for npc three-level converter-pmsm system
  • Model predictive torque control method for npc three-level converter-pmsm system

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0041] Embodiments of the present invention and its implementation work process are as follows:

[0042] The specific implementation of the NPC three-level converter-PMSM system structure is as follows: figure 1 As shown, the NPC three-level converter-PMSM system includes a voltage source, a rectifier bridge, an NPC three-level converter and a permanent magnet synchronous motor; the rectifier bridge is composed of three groups of diode groups connected in parallel, and each group of diodes The group is composed of two diodes in series, and the connection between the two diodes of the three groups of diodes is connected to the voltage source; the three groups of diodes are connected in parallel to output the rectified voltage V dc ;

[0...

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Abstract

The invention discloses an improved model predictive torque control method for an NPC three-level converter-PMSM system. Calculate the offset threshold, and divide the midpoint voltage offset of the two DC support capacitors in the converter into two types of regions according to the offset threshold: for a larger midpoint voltage offset, in each sampling period according to the current midpoint The voltage offset calculates the actual amplitude and phase of the small and medium vectors of the converter, and dynamically divides the sectors; according to the control objectives of different areas, constructs the cost function and the finite control set and obtains the optimal voltage vector, and outputs the optimal voltage vector ; Add dead time to the control time corresponding to the optimal voltage vector to output the PWM signal to the permanent magnet synchronous motor for control. The invention can improve the performance of torque and flux linkage control, reduce the amount of calculation, and solve the problems of complex weight coefficient setting process in the existing control, and the decrease of system torque, flux linkage and current control performance when the midpoint voltage offset amplitude is large, etc. question.

Description

technical field [0001] The invention belongs to the field of motor control, and more specifically relates to an improved model predictive torque control method for a permanent magnet synchronous motor powered by a neutral point clamp type (NPC) three-level converter, which is used to solve the problem of neutral point voltage The problem of large torque and current fluctuations when the offset is large. Background technique [0002] Permanent magnet synchronous motor (PMSM) has the advantages of high power density, simple structure, low noise and high efficiency. Three-level converters have many advantages such as small voltage stress on single switching devices when powered by the same DC power supply, high output voltage quality, and low switching loss at the same switching frequency. Therefore, the NPC three-level converter-permanent magnet synchronous motor system is widely used in medium-high voltage and high-power motor drive applications, such as traction transmissio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/05H02P21/30H02P27/12H02P27/08
CPCH02P21/05H02P27/085H02P27/12H02P21/30
Inventor 宋鹏彭世豪阎彦史婷娜夏长亮
Owner ZHEJIANG UNIV
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