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Three-phase rectifier rapid model predictive control method

A technology of model predictive control and three-phase rectifier, which is applied to the control of three-phase voltage type rectifier and fast model predictive control of three-phase rectifier. The effect of simplifying the calculation process

Inactive Publication Date: 2013-09-25
HENAN NORMAL UNIV
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Problems solved by technology

This method can effectively reduce the running time of the control algorithm and improve the operating efficiency of the algorithm, but the algorithm will affect part of the control performance of the model predictive control
Some scholars have proposed a simplified control algorithm for the model predictive control of cascaded H-bridge inverters, which cannot be applied to other types of converters.

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Embodiment Construction

[0018] 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 rectifier is as follows: figure 1 shown. In the figure, u ga , u gb , u gc is the three-phase voltage 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 with 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.

[0019] The mathematical model of the three-phase voltage-type rectifier can be transformed into a two-phase stationary coordinate system through coordinate transformation, expressed as

[0020] (1)

[0021] In the formula: i α , i...

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Abstract

The invention discloses a three-phase rectifier rapid model predictive control method. According to the technical scheme, the method is characterized by including the steps that an output voltage reference value needed by a next moment is acquired according to a three-phase voltage rectifier model and a current reference value, equivalent transformation is conducted on a value function in model prediction control to acquire a value function expression based on output voltage, and lastly an optimal output voltage vector is chosen through a vector zonal method. Specific to the control of a three-phase voltage rectifier, the model predictive control method can effectively simplify the steps of traditional model predictive control. Therefore, the control algorithm structure is simple, calculation amount is small, calculation time is remarkably shortened, response speed of a control system is guaranteed, stable operation of the control system is guaranteed, and conditions are provided for expanding other auxiliary control algorithms.

Description

technical field [0001] The invention relates to a control method of a three-phase voltage type rectifier, belongs to the control field of power electronic power conversion devices, and in particular relates to a fast model predictive control method for a three-phase rectifier. Background technique [0002] The model predictive control algorithm of the three-phase voltage-type rectifier usually adopts the loop optimization, direct output variable frequency control method, and the algorithm only outputs one switching state in each control cycle. Therefore, in order to obtain faster response speed and good control quality, the control cycle of model predictive control is generally shorter. Although the model predictive control structure is simple, in practical applications, compared with a very short control period, its cycle prediction and optimization process is more complex, the amount of calculation is large, and the calculation performance of the controller is required to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12
Inventor 王萌施艳艳高金辉常方高
Owner HENAN NORMAL UNIV
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