Micro-grid group architecture and autonomous coordination control method thereof

A technology of coordinated control and micro-grid group, which is applied in the circuit layout, electrical components, circuit devices, etc. of AC and DC networks. It can solve the problems of weak anti-disturbance ability and limited working capacity, and achieve the effect of autonomous coordinated control.

Active Publication Date: 2017-05-10
HUNAN UNIV
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  • Claims
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Problems solved by technology

However, a single micro-grid has shortcomings such as limited working capacity and weak anti-disturbance ability, coupled with the intermittent output power of distributed power sources and the variabili

Method used

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  • Micro-grid group architecture and autonomous coordination control method thereof
  • Micro-grid group architecture and autonomous coordination control method thereof
  • Micro-grid group architecture and autonomous coordination control method thereof

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Embodiment Construction

[0041] figure 1 It is a microgrid group architecture diagram of an embodiment of the present invention, mainly including AC and DC subnets, PEU and EP; wherein the AC and DC subnets are composed of distributed power sources, power electronic converters and loads; PEU consists of multiple AC / DC Converter and DC / DC converter, and all AC and DC sub-networks exchange power with EP through PEU; EP is formed by parallel connection of multiple bidirectional DC / DC converters connected to energy storage batteries.

[0042] figure 2 It is a structural diagram of PEU power coordination control of adaptive power exchange coefficient according to an embodiment of the present invention, and the specific control method includes the following steps:

[0043] 1) At the beginning of each sampling period, the three-phase output voltage u of the nth AC / DC converter in the PEU is respectively abc,n , three-phase output current i abc,n , the DC output voltage u of the mth DC / DC dc,m , output c...

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Abstract

The present invention discloses a micro-grid group architecture and an autonomous coordination control method thereof. The architecture mainly comprises an AC sub-network, a DC sub-network, a PEU and an EP. The PEU is mainly used for coordinating the power exchange among all sub-networks with the EP within a micro-grid group, so that the energy mutual aid of all sub-networks is realized. Meanwhile, the bus voltage and the frequency of each sub-network are maintained to be stable. The EP is mainly used for maintaining the stable operation of the DC bus voltage of the PEU and realizing the reasonable distribution of the exchanged net power required for the PEU. In addition, the invention provides a power coordination control method and a hierarchical coordination control method for the adaptive power exchange coefficients of the PEU and the EP respectively. In this way, the autonomous coordination control of the micro-grid group is effectively realized. The architecture and the method can be widely applied to the interconnection system of a plurality of AC and DC micro-grids.

Description

technical field [0001] The invention relates to the technical field of micro-grid group control, in particular to an autonomous coordination control method of a micro-grid group. Background technique [0002] With the depletion of traditional fossil energy and the intensification of the global energy crisis, distributed power sources such as solar energy and wind energy have been widely used. As an effective means of accepting distributed power sources, microgrids have gradually attracted widespread attention from the society. A microgrid is a controllable system composed of distributed power sources, energy storage batteries, loads and power electronic converters, which can be connected to the grid or isolated. However, a single micro-grid has shortcomings such as limited working capacity and weak anti-disturbance ability, coupled with the intermittent output power of distributed power sources and the variability of loads, how to effectively improve the power supply of micr...

Claims

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Application Information

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IPC IPC(8): H02J4/00
CPCH02J4/00
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
Owner HUNAN UNIV
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