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Current predictive control method for two-level three-phase grid-connected inverter

A control method and current prediction technology, applied in the field of electric power, can solve the problems of high requirements on controller computing power, limited sampling frequency, and large amount of calculation, so as to improve the current tracking effect, reduce the distortion rate, and achieve accurate current control. Effect

Active Publication Date: 2017-05-10
SHANDONG UNIV
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Problems solved by technology

[0006] Predictive control can also be based on the space vector PWM method, that is, SVPWM, which can improve the above shortcomings, but there are two major shortcomings in this method. Sampling frequency; Second, the SVPWM method will make the switching frequency several times higher than the finite set model predictive control algorithm

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  • Current predictive control method for two-level three-phase grid-connected inverter
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  • Current predictive control method for two-level three-phase grid-connected inverter

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Embodiment Construction

[0058] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0059] Such as figure 1 The circuit shown is a typical circuit of a two-level three-phase grid-connected inverter. The output voltage of the inverter is connected to the grid through a filter inductor L and a resistor R for grid-connection. The model mathematical model of the two-level three-phase grid-connected inverter in the three-phase static coordinate system is as follows:

[0060]

[0061] Among them, e a 、e b 、e c are the voltages of abc three-phase grid, u aN , u bN , u cN are the output voltages of A, B, and C phases of the two-level three-phase grid-connected inverter, i a i b i c is the grid current, u Nn is the voltage between the negative terminal of the DC voltage and the common terminal of the grid, and the direction is as figure 1 Shown; L is the filter inductor; R is the resistor connected in series with the filter inductor.

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Abstract

The present invention discloses a current prediction control method for two-level three-phase grid-connected inverter. The method comprises the steps of collecting the voltage of a three-phase grid and a grid-connected current signal in real time, using the voltage of the three-phase grid and the grid-connected current signal collected in real time and a two-level three-phase grid-connected inverter model in a three-phase static coordinate to carry out two-phase static alpha beta coordinate conversion and obtaining the output voltage vector needed by the two-level three-phase grid-connected inverter, selecting the optimal effective voltage vector of the two-level three-phase grid-connected inverter according to the obtained output voltage vector needed by the two-level three-phase grid-connected inverter and obtaining the optimal action time of the optimal effective voltage vector, and using the optimal action time of the effective voltage vector to obtain the switch-on and switch-off times of an inverter switch element, and thus realizing the control of the output current of the two-level three-phase grid-connected inverter. According to the prediction control method of the invention, the current tracking effect can be improved, the distortion rate is reduced, and thus the switch change becomes regular.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a current predictive control method for a two-level three-phase grid-connected inverter. Background technique [0002] With the increasing shortage of non-renewable energy and the increasing environmental pollution, renewable energy such as solar energy, wind energy, and biomass energy is developing rapidly and playing an increasingly important role, which is the future of human energy. Inverter technology is one of the basic conversion technologies of power electronics. Grid-connected inverters are the interface between renewable energy power generation systems and the grid. They play an indispensable role, and their performance will directly affect the power quality of the grid. The speed and accuracy of inverter current tracking are particularly important, and the research work on grid-connected inverters has important application value. [0003] The current tracking...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/537H02J3/38
Inventor 陈阿莲张子成张承慧邢相洋
Owner SHANDONG UNIV
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