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Grid-connected converter system and model prediction control method thereof

A model predictive control, flow system technology, applied in the control/regulation system, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc. The effect of suppressing grid voltage distortion, ensuring stability and high reliability

Active Publication Date: 2021-01-01
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a grid-connected converter system and its model predictive control method, which is used to solve the problem that the existing control method will cause distortion of the grid voltage output by the converter

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  • Grid-connected converter system and model prediction control method thereof
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  • Grid-connected converter system and model prediction control method thereof

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Embodiment Construction

[0049] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0050] Method example:

[0051] Such as figure 1 The topological structure of the photovoltaic grid-connected converter system shown includes: photovoltaic power generation system (1), converter module (2), LCL filter (3), point of public coupling (PCC) (4), DC side voltage A sampling circuit (5), an AC side voltage and current sampling circuit (6), a converter control module (7), and an energy management system (8).

[0052] Wherein, the photovoltaic power generation system (1) includes: a photovoltaic array (101), a Buck-Boost converter (102), a first controller (103), and a first drive module (104). The first controller (103) obtains DC bus voltage U dc signal, the PWM signal of the Buck-Boost converter is obtained through PI control, and the Buck-Boost converter is controlled to work through the first drive module (104). The output e...

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Abstract

The invention relates to a grid-connected converter system and a model prediction control method thereof, and belongs to the technical field of AC / DC conversion. The grid-connected converter system comprises a converter and an LCL filter, the converter is used for connecting a power grid through the LCL filter, and the control method comprises: utilizing a second-order generalized integral transfer function to construct a virtual vector to establish a controller prediction model, Wherein the model is an alternating current side current prediction model, and then performing optimization by using a preset cost function to select a group of switch state signals. Current control is realized by converting a power reference value into a current reference value, and in an alternating current sidecurrent prediction model, power grid voltage distortion is inhibited by performing current compensation on network access current, so that the stability and the reliability of system work are ensured.

Description

technical field [0001] The invention belongs to the technical field of AC-DC conversion, and in particular relates to a grid-connected converter system and a model predictive control method thereof. Background technique [0002] In recent years, distributed generation of renewable energy such as photovoltaics has received more and more attention. In a distributed generation system, each power generation unit is connected to the grid at the point of public coupling (PCC) through a converter. Since multiple converters are connected in parallel to the PCC with different line distances, and the working conditions of each converter are different, the harmonic content contained in the output current is also different, so the line impedance at the PCC often fluctuates, showing a weak current The characteristics of the grid make the working environment of the distributed generation system complex and changeable. As the interface between the renewable energy distributed generation s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5387H02M3/158H02M1/12H02J3/38
CPCH02J3/381H02M1/12H02M3/1582H02M7/487H02M7/53871H02J2300/26H02M1/0009Y02E10/56
Inventor 黄景涛任兆文宋书中弓少康刘俊志杨清梁云朋
Owner HENAN UNIV OF SCI & TECH