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Independent power coordination control method applicable for AC/DC hybrid microgrid

An AC-DC hybrid and coordinated control technology, applied in electrical components and other directions, can solve the problem of unrealistic DGs consumption, and achieve the effect of wide application and power sharing control.

Active Publication Date: 2017-11-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is not realistic to use DC microgrid alone to solve the problem of DGs consumption, because the traditional AC grid has a long history, and the existing infrastructure equipment will be used for a long time. Therefore, it is necessary to find a more reasonable microgrid Architecture to accommodate various types of DGs

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  • Independent power coordination control method applicable for AC/DC hybrid microgrid
  • Independent power coordination control method applicable for AC/DC hybrid microgrid
  • Independent power coordination control method applicable for AC/DC hybrid microgrid

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Embodiment Construction

[0032] figure 1 It is an architecture diagram of an AC-DC hybrid microgrid according to an embodiment of the present invention, mainly including AC and DC subnets, energy storage systems and BICs; the AC subnet and DC subnet include sequentially connected distributed power sources, power electronic converters, and Load; the energy storage system in the DC subnet is composed of multiple bidirectional DC / DC converters connected in parallel to the energy storage battery. The BICs include multiple bidirectional interface converters, and the AC and DC subnets can perform power exchange through the BICs. figure 1 The middle PV is a distributed power supply.

[0033] figure 2 It is a block diagram of the topology of BICs and its autonomous power coordination control according to an embodiment of the present invention, and the specific control method includes the following steps:

[0034] 1) At the beginning of each sampling period, the three-phase output voltage u of the nth BIC ...

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Abstract

The invention discloses an independent power coordination control method applicable for an AC / DC hybrid microgrid. The power exchange of subnets on two sides of the AC / DC hybrid microgrid is coordinated through an independent power coordination control strategy of BICs, so that mutual acid of energy is realized in AC / DC subnets, and the stability of busbar voltage and frequency inside each subnet is maintained; and moreover, due to the fact that the power coordination control method based on droop control is adopted by the BICs, power equipartition control among the BICs is effectively realized. The method can be widely applied to the AC / DC hybrid microgrid system.

Description

technical field [0001] The invention relates to the technical field of AC-DC hybrid micro-grid control, in particular to an autonomous power coordination control method suitable for AC-DC hybrid micro-grid. Background technique [0002] With the increasing proportion of distributed generation (Distributed Generations, DGs) such as solar energy and wind energy in the power grid, microgrid has become an effective solution to accommodate DGs. Since the voltage and current characteristics of the AC microgrid are the same as those of the traditional grid, the AC microgrid was first proposed. Many scholars have conducted research on the topology, control theory and power quality of the AC microgrid, especially in the parallel power sharing of multiple inverters. and circulation suppression. But in fact, a large part of the DGs output characteristics are DC characteristics, and the DC load is increasing year by year. In order to improve the efficiency of energy utilization, DC mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00
Inventor 罗安周小平陈燕东周乐明伍文华杨苓王自力江舟姜劲松谭文娟
Owner HUNAN UNIV
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