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Control method of three-phase grid-connected inverter

A control method and inverter technology, applied in the field of electric power, can solve problems such as unfavorable system performance, large amount of algorithm calculation, and poor practicability

Inactive Publication Date: 2016-04-20
STATE GRID QINGHAI ELECTRIC POWER +2
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Problems solved by technology

The problem of the traditional PI control method is that the mutual coupling of the models is not good for the system performance, and the parameter design and selection of the proportional-integral controller are cumbersome.
However, its algorithm has a large amount of calculation and is not practical, and only the output voltage is predicted.

Method used

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  • Control method of three-phase grid-connected inverter
  • Control method of three-phase grid-connected inverter
  • Control method of three-phase grid-connected inverter

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Embodiment Construction

[0040] 1. Three-phase grid-connected inverter prediction model

[0041] The topology of the three-phase voltage type grid-connected inverter is as follows: figure 1 As shown, the grid-connected inverter is connected to the grid through a filter inductor L and a resistor R.

[0042] The system model is used to predict the state variables of the system in the future. According to Kirchhoff's voltage law, the dynamic equation of the inverter output current is:

[0043] i · a i · b i · c = - R L ...

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Abstract

The invention discloses a control method of a three-phase grid-connected inverter, which is used for solving the problems of large computation and poor control performance of an existing control method. The technical scheme is characterized in that the control method comprises the following steps: firstly, building an output current prediction model of the three-phase grid-connected inverter under an alpha-beta coordinate system; secondly, obtaining an optimal switching function combination which is used for controlling the three-phase grid-connected inverter by utilizing the built output current prediction model and adopting a two-step prediction algorithm; finally, controlling all switching devices of the three-phase grid-connected inverter by utilizing the optimal switching function combination of the three-phase grid-connected inverter. According to the control method of the three-phase grid-connected inverter, disclosed by the invention, the three-phase grid-connected inverter is controlled by adopting the two-step prediction control algorithm on the basis of the built output current prediction model of the three-phase grid-connected inverter; compared with an existing inverter control method, the control method has the advantages that the computation is small, and the control performance is ideal.

Description

technical field [0001] The invention relates to a two-step predictive control method for output current of a three-phase grid-connected inverter, which belongs to the technical field of electric power. Background technique [0002] For three-phase voltage grid-connected inverters, the commonly used control methods mainly include hysteresis control and linear PI control. Hysteresis control has a good dynamic response, but requires a high sampling frequency, which will bring large switching losses to the inverter. The problem of the traditional PI control method is that the mutual coupling of the models is not good for the system performance, and the parameter design and selection of the proportional-integral controller are cumbersome. [0003] In recent years, with the improvement of the operation speed of digital signal processors, some new intelligent control methods have emerged, such as fuzzy control, adaptive control, sliding mode variable structure control, model predi...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/38H02J2203/20H02M7/5387
Inventor 杨立滨李牡丹张海宁王印松王淑媛
Owner STATE GRID QINGHAI ELECTRIC POWER
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