Bidirectional droop control method for IC (Interlinking Converter) in AC-DC (Alternating Current-Direct Current) mixed microgrid

An AC-DC hybrid and control method technology, applied in the control field, can solve problems such as reducing system stability, uncontrollable output power, and unfavorable grid connection.

Inactive Publication Date: 2015-08-19
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The bidirectional converter with constant voltage control makes the output power of the HMG uncontrollable, which is not conducive to grid connection, and the balance of the bus voltage or frequency is completely dependent on the bidirectional converter, which reduces the stability of the system; the droop control method considers the AC side or the DC side The voltage signal on one side does not take into account the influence of the signals on both sides on the working condition of the IC

Method used

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  • Bidirectional droop control method for IC (Interlinking Converter) in AC-DC (Alternating Current-Direct Current) mixed microgrid
  • Bidirectional droop control method for IC (Interlinking Converter) in AC-DC (Alternating Current-Direct Current) mixed microgrid
  • Bidirectional droop control method for IC (Interlinking Converter) in AC-DC (Alternating Current-Direct Current) mixed microgrid

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Embodiment Construction

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

[0050] The typical topology of AC / DC hybrid microgrid is as follows: figure 1 Shown, where, Z AC ,Z DCare the line and filter impedances, respectively. The AC-DC hybrid microgrid is mainly composed of AC subnet, DC subnet and IC. There can be multiple ICs, and the number of DC subnets can also be multiple, depending on actual needs. The AC-DC hybrid microgrid is connected to the AC grid through the common connection point PCC. The DC bus and the AC bus are connected through an IC, and S1 is an isolating switch on the AC side of the IC.

[0051] In the grid-connected operation mode of the AC-DC hybrid microgrid, the switch at the PCC and S1 are closed, and the microgrid can be powered by the AC grid, and can also feed excess power back to the AC grid;

[0052] When the AC grid fails, the PCC output switch is disconnected, and the AC-DC hybrid microgrid i...

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Abstract

The invention provides a bidirectional droop control method for an IC (Interlinking Converter) in an AC-DC (Alternating Current-Direct Current) mixed microgrid for performing Udc-f-P bidirectional droop control and recovery control of the IC in the AC-DC mixed microgrid. With the method, bidirectional flow of electric energy is controlled; the maximum utilization of distributed energy is achieved; the voltage quality is ensured; drop of direct current voltage and frequency is prevented; uniform load distribution among interlinking converters is achieved; and the stability of the AC-DC mixed microgrid is improved.

Description

technical field [0001] The invention relates to a control method, in particular to a bidirectional droop control method of an IC in an AC-DC hybrid microgrid. Background technique [0002] In the AC-DC hybrid microgrid, the converter that connects the AC subnet and the DC subnet and controls the power conversion between the AC bus and the DC bus is called an interlinking converter (IC). IC controls the two-way flow of electric energy to realize the maximum utilization of distributed energy. Many scholars have conducted in-depth research on the droop control method of distributed power converters. The droop method mainly includes adjusting the DC voltage to control the active power output of the DC voltage-active power U dc -P droop with f-P and U-Q droop for adjusting AC frequency and voltage control power output. The droop control method of traditional distributed power supply cannot be well applied to IC for the following reasons: [0003] (1) Different from the distrib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
Inventor 季宇刘海涛苏剑高泽吴鸣李洋于辉李蕊吕志鹏
Owner CHINA ELECTRIC POWER RES INST
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