Self-correcting prediction control method of model of three-phase voltage type PWM (Pulse-Width Modulation) rectifier

A three-phase voltage and predictive control technology, which is applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve problems such as increased program operation time, impact on operating performance, and complex algorithms, etc., to achieve Effects of enhancing robustness, eliminating influence, and achieving stable operation

Inactive Publication Date: 2013-02-06
HENAN NORMAL UNIV
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Problems solved by technology

[0003] Since the MPC control process adopts loop optimization and direct output indefinite frequency mode, its sampling frequency is high, and the operation performance is obviously affected by system delay.
Although the above algorithms can eliminate the influence of model errors on the control system, the algorithms are relatively complex, which greatly increases the calculation time of the program, thereby affecting the control effect

Method used

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  • Self-correcting prediction control method of model of three-phase voltage type PWM (Pulse-Width Modulation) rectifier
  • Self-correcting prediction control method of model of three-phase voltage type PWM (Pulse-Width Modulation) rectifier
  • Self-correcting prediction control method of model of three-phase voltage type PWM (Pulse-Width Modulation) rectifier

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings. The topology of the main circuit of the three-phase voltage-type PWM rectifier is as follows: figure 1 shown. In the figure, u ga , u gb , u gc It is a three-phase voltage source on the AC side; i ga , i gb , i gc is the three-phase AC side current; u ca , u cb , u cc is the three-phase voltage at the input side of the rectifier bridge; u dc is the DC side voltage; L g and R g Respectively, the incoming inductance and its equivalent resistance; C Is the DC filter capacitor; O is the grid midpoint; i L is the load current, the DC side load is determined by the resistor R L equivalent representation.

[0011] The mathematical model of the three-phase VSR can be transformed into a two-phase stationary coordinate system through coordinate transformation, expressed as

[0012] (1)

[0013] In the formula: u...

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Abstract

The invention discloses a self-correcting prediction control method of a model of a three-phase voltage type PWM (Pulse-Width Modulation) rectifier. According to the technical scheme point provided by the invention, when model parameters of a controlled member are mismatched, actual model parameters are observed and a prediction model is modified in real time by the self-correcting prediction control method of the model of the three-phase voltage type PWM rectifier, an optimal voltage vector is then obtained, and a switch position signal corresponding to the obtained optimal voltage vector is taken as a switch signal for controlling a power device. According to the self-correcting method of the model provided by the invention, on the premise that a hardware structure is not changed, the influence of mismatched model parameters on a control system is eliminated, the robustness of a prediction control system of the model in enhanced, and the stable operation of the three-phase voltage type PWM rectifier under a condition that a large error exists in the prediction model is realized by adding an inductance observing algorithm.

Description

technical field [0001] The invention relates to a control method for a three-phase voltage-type PWM rectifier, which belongs to the control field of power electronic power conversion devices, and in particular to a model self-correction prediction control method for a three-phase voltage-type PWM rectifier. Background technique [0002] With the rapid development of microprocessor technology and the deepening of related research, the application of model predictive control (MPC) in power electronics and motor drives has shown great potential and advantages. Since the MPC algorithm needs to predict the running state of the object at the next moment according to the mathematical model, it requires high accuracy of the model. Power electronic power circuits often contain devices such as resistors, inductors, and capacitors. Changes in temperature, saturation of the magnetic circuit, cable overload, and changes in other environmental conditions will cause changes in the paramet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
Inventor 王萌施艳艳
Owner HENAN NORMAL UNIV
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