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A grid-connected converter system and its model predictive control method

A model predictive control, flow system technology, applied in the control/regulation system, the conversion of DC power input to DC power output, and the conversion of AC power input to DC power output, etc., can solve problems such as transformer grid voltage distortion

Active Publication Date: 2021-08-20
HENAN UNIV OF SCI & TECH
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  • 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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  • A grid-connected converter system and its model predictive control method
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  • A grid-connected converter system and its model predictive control method

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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 predictive control method thereof, belonging to the technical field of AC-DC conversion. The grid-connected converter system includes a converter and an LCL filter, and the converter is used to connect to the power grid through the LCL filter , the control method uses the second-order generalized integral transfer function to construct a virtual vector to establish a controller prediction model, that is, the AC side current prediction model, and then uses the preset cost function to optimize and optimize a set of switch state signals. Current control is realized by converting the power reference value into a current reference value, and in the current prediction model on the AC side, through current compensation for the incoming current, the voltage distortion of the grid is suppressed, ensuring the stability of the system and high reliability.

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 Patents(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