Control method of three-phase voltage source converter based on multi-step predictive control of switching system

A switching system and multi-step prediction technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as large harmonic interference, complex parameter adjustment, and poor control effect , to simplify the design process, reduce harmonic interference and reactive power, and improve performance

Active Publication Date: 2015-10-28
ZHEJIANG UNIV +2
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Problems solved by technology

The invention is used to solve the problems of poor control effect, large harmonic interference and complicated parameter adjustment in the existing method, and improve the performance of the converter

Method used

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  • Control method of three-phase voltage source converter based on multi-step predictive control of switching system
  • Control method of three-phase voltage source converter based on multi-step predictive control of switching system
  • Control method of three-phase voltage source converter based on multi-step predictive control of switching system

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Embodiment Construction

[0032] The principles and specific implementation methods of the present invention will be described below in conjunction with the accompanying drawings.

[0033] Such as figure 2 As shown, the present invention provides a three-phase voltage-type DC / AC converter control method based on multi-step predictive control of switching systems. This method is applied to the scene where the converter is connected to a large power grid or a relatively stable AC power, such as image 3 shown. Its specific process includes:

[0034] (1) Determination of the three-phase reference output current;

[0035] (2) Establishment of converter switching system model and switching subsystem;

[0036] (3) Prediction of the output current of each subsystem in the first switching cycle;

[0037] (4) Optimization of the first switching cycle subsystem;

[0038] (5) Prediction of the output current of each subsystem in the second switching cycle;

[0039] (6) Determination of the actual switchin...

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Abstract

The invention relates to the field of power electronics alternating current and direct current conversion and aims to provide a three-phase voltage type converter control method based on switching system multi-step predictive control. The method comprises the steps of determining three-phase reference output current, establishing a converter switching system model and a switching subsystem, predicating first switching period each subsystem output current, carrying out optimization of the first switching period subsystem, predicating second switching period each subsystem output current, determining a converter real switching state, and correcting a system error. According to the method, through introducing a switching system analysis method and the relate theory of multi-step predictive control, the performance of a converter is improved, the accuracy of output power is raised, the harmonic disturbance and the reactive power are reduced, a system design process is simplified, and the use of auxiliary equipment is reduced.

Description

technical field [0001] The invention relates to a control method of a three-phase voltage type DC / AC converter based on multi-step predictive control of a switching system, and belongs to the field of AC-DC conversion of power electronics. Background technique [0002] As one of the most important power devices in the field of power electronics, the three-phase voltage DC / AC converter has a huge application market. figure 1 A schematic diagram of a typical application of the converter is shown. In order to improve efficiency, reduce power loss, and reduce the impact on the grid, its control methods have been highly valued by the research field. The traditional control strategy is mainly double closed-loop PI control (including power outer loop and current inner loop). Although this control strategy can meet the basic requirements of the current application field, it is difficult to set the PI parameters accurately, and it is difficult to set PI parameters for different appl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/537
Inventor 包哲静吴钢吴婷杨强颜文俊赵发坤贺惠民吴涛李善颖
Owner ZHEJIANG UNIV
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