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A Model Predictive Power Dynamic Compensation Control Method for Dual PWM Frequency Conversion System

A technology of model prediction and dynamic compensation, applied in reactive power compensation, motor generator control, AC motor control, etc., to achieve the effects of bilateral control performance, improved dynamic response, and suppression of bus voltage fluctuations

Active Publication Date: 2022-05-17
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

However, the existing improvement methods, such as adaptive control, focus on improving the dynamic response speed of the rectifier to reduce bus voltage fluctuations, and cannot fundamentally solve the problem of voltage fluctuations.

Method used

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  • A Model Predictive Power Dynamic Compensation Control Method for Dual PWM Frequency Conversion System
  • A Model Predictive Power Dynamic Compensation Control Method for Dual PWM Frequency Conversion System
  • A Model Predictive Power Dynamic Compensation Control Method for Dual PWM Frequency Conversion System

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Embodiment Construction

[0051] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0052] Embodiments of the present invention provide a model predictive power dynamic compensation control method for a dual PWM frequency conversion system, such as figure 1 As shown, the method includes the following steps:

[0053] Parker transformation is performed on the grid-side voltage and current of the dual PWM rectifier-inverter system, and the predicted current at time k+1 is calculated through the discrete time model, and the current at time k+2 is predicted on the basis of the current at time k+1, and Continuous scrolling optimization;

[0054] Construct an optimized voltage expansion state observer ESO, combine the predicted current under rolling optimization and ESO optimization estimation principle, and obtain the pred...

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Abstract

The invention discloses a model predictive power dynamic compensation control method of a dual PWM frequency conversion system, comprising: adopting model predictive control on both sides of the rectification-inverter, using the input voltage vector and the input current vector at the current moment to calculate the power prediction value at the next moment ; Combining the predicted current under rolling optimization and the ESO optimization estimation principle, the predicted value of the bus voltage at k+2 time is obtained by rolling the current value at k+2 time; on the basis of bus voltage tracking estimation, according to the instantaneous energy Based on the balance principle, the energy flow balance equation is established, the power compensation amount predicted in advance on the rectification side is calculated, and feedforward correction is performed. The invention can suppress the bus voltage fluctuation problem caused by load mutation and system disturbance, and realize the coordinated improvement of the control performance of both sides.

Description

technical field [0001] The invention relates to the technical field of rectifier control, in particular to a model predictive power dynamic compensation control method for an AC-DC-AC double PWM frequency conversion system. Background technique [0002] Compared with the early AC-AC structure, the AC-DC-AC structure rectifier has the advantages of simple structure, bidirectional flow of energy, and adjustable power factor on both sides in the frequency conversion system in the fields of power electronic transmission and new energy power generation. And it solves the problem that the AC-AC structure can only work below the power frequency, and has been widely used. With the development of automatic control, a variety of frequency conversion control schemes based on dual PWM have been proposed one after another. Among them, model predictive direct power control is a control strategy based on power prediction, rolling optimization and optimal voltage vector selection. Because...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02P27/08H02P21/13H02P21/14H02P21/22
CPCH02M5/4585H02P27/085H02P21/13H02P21/14H02P21/22H02P21/0003Y02E40/30
Inventor 肖雄王浩丞张勇军韩硕张飞宗胜悦
Owner UNIV OF SCI & TECH BEIJING
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