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Bidirectional alternating and direct current converter model prediction current control method

A technology of AC-DC conversion and current control, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., and can solve problems such as complex control and large amount of calculation

Active Publication Date: 2017-06-06
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is the technical problem that the existing bidirectional AC-DC converter adopts the control strategy of pulse width modulation with large amount of calculation and complex control, thereby providing a bidirectional AC-DC converter model predictive current control method

Method used

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  • Bidirectional alternating and direct current converter model prediction current control method
  • Bidirectional alternating and direct current converter model prediction current control method
  • Bidirectional alternating and direct current converter model prediction current control method

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Embodiment Construction

[0098] Such as Figure 1-2 As shown, a bidirectional AC-DC converter model predictive current control method, the steps are as follows,

[0099] Step S1, define the switching state S of the bidirectional AC-DC converter i ;

[0100]

[0101] Among them, i is the phase of AC grid, and i∈(a,b,c);

[0102] S2, obtain the output voltage vector U of the bidirectional AC-DC converter in the αβ two-phase static coordinates j with switch state S i the expression.

[0103] The specific steps are, S2.1, in the abc three-phase stationary coordinate system, obtain the output voltage and switch state S of the bidirectional AC-DC converter i The calculation formula of is as follows:

[0104]

[0105] Among them, U dc is the DC bus voltage, u an is the a-phase output voltage of the bidirectional AC-DC converter; u bn is the b-phase output voltage of the bidirectional AC-DC converter; u cn is the c-phase output voltage of the bidirectional AC-DC converter; S a is the switch s...

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Abstract

The invention discloses a bidirectional alternating and direct current converter model prediction current control method. The method includes the following steps: S1, defining a switch state S1; S2, obtaining expressions of an output vector Uj and the switch state Si; S3, constructing a secondary power prediction model and an output current secondary prediction model; S4, calculating output current reference values i[alpha]ref and i[beta]ref; S5, constructing a value function g; S6, carrying out initialization; S7, collecting power grid voltage and output current; S8, calculating output voltage Uj in the current switch state; S9, calculating a first output current predicted value and a first power predicted value; S10, calculating a second output current predicted value and a second power predicted value; S11, calculating the output current reference values i[alpha]ref and i[beta]ref; S12, calculating the value function g; S13, comparing the value function g with a comparison variable m, and performing assignment of the minimum on the comparison variable m; and S14, conducting determination and output. Through two-step prediction of output power, an optimal voltage vector is calculated in advance, effective compensation is provided for algorithm time delays, and the influence of time delays upon the performance of a system is reduced.

Description

technical field [0001] The invention belongs to the technical field of smart grids, and in particular relates to a model predictive current control method for a bidirectional AC-DC converter. Background technique [0002] In recent years, the integration of various distributed DC power sources such as photovoltaic power generation, fuel cells, and batteries has made bidirectional AC-DC power conversion an important issue that continues to be solved. DC distributed power generation generally forms a distributed power generation system by establishing a DC micro-grid and connecting it to a large power grid. The two-way flow of energy between the grid and the distributed generation system is realized through a bidirectional AC-DC converter and an energy management system between the grid and the DC bus. [0003] At present, most of the control strategies for bidirectional AC-DC converters use pulse width modulation, the outer voltage loop controls the DC side voltage to be con...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/24H02J3/26
CPCH02J3/24H02J3/26H02J3/381H02J2203/20Y02E40/50
Inventor 孔汉武洁葛勋金楠江豪申永鹏曹玲芝里昂·托伯特衡龙雨赵衡焱
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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