Single-phase and three-phase parallel-serial connection multi-microgrid day-ahead economic optimization method taking account of constraint of degree of unbalance

An economic optimization and balance degree technology, applied in the field of multi-microgrid economic optimization, can solve the problems of not considering single-phase multi-microgrid economic optimization, not satisfying the three-phase unbalanced scheduling constraints, etc., so as to reduce the three-phase unbalance degree. , the effect of improving economic efficiency

Active Publication Date: 2016-10-12
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, this method only considers the economic optimal scheduling of a single microgrid, and does not consider the economic optimization

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  • Single-phase and three-phase parallel-serial connection multi-microgrid day-ahead economic optimization method taking account of constraint of degree of unbalance
  • Single-phase and three-phase parallel-serial connection multi-microgrid day-ahead economic optimization method taking account of constraint of degree of unbalance
  • Single-phase and three-phase parallel-serial connection multi-microgrid day-ahead economic optimization method taking account of constraint of degree of unbalance

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[0027] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0028] figure 1 It is a flow chart of the day-a-day economic optimization of single-three-phase hybrid multi-microgrid. The specific steps are as follows:

[0029] (1) Perform distributed single-micro-grid economic optimization for each single-phase and three-phase micro-grid, and obtain the optimal solution set G of each single-microgrid energy storage output bestk , K=1~3, 1 represents phase A, 2 represents phase B, and 3 represents phase C;

[0030] (2) The optimal solution set G of each single microgrid obtained in step (1) bestk , Converted into tie-line power value and uploaded to the multi-microgrid central controller in phase sequence, and the imbalance constraint correction algorithm is completed in the central controller. The specific conversion process of tie line power value is a...

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Abstract

The invention discloses a single-phase and three-phase parallel-serial connection multi-microgrid day-ahead economic optimization method taking account of the constraint of degree of unbalance. With an increase in the access number of microgrids in a single grid area, a multi-microgrid with a complex operation mode and control mode is formed. The multi-microgrid, as a microgrid group with a complex structure and control mode, has significant meaning to the research of a economic optimization algorithm for a light-storage multi-microgrid with a high commercial application value. The invention provides a multi-microgrid day-ahead economic optimization method taking account of the constraint of degree of unbalance for a single-phase and three-phase parallel-serial topology. The method is based on a layered and hierarchic communication architecture and information transmission mode and uses a double-layer rolling optimization as structure. A bottom layer uses optimal economical efficiency of the each sub microgrid as a target. A top layer obtains the corresponding output of each sub microgrid by balancing the optimized single-phase sub microgrid connection line power values of the bottom layer. An example verifies that the method is feasible, reduces the three-phase degree of unbalance of a system, and provides certain reference meaning for an increase in the multi-microgrid economical efficiency.

Description

technical field [0001] The invention relates to the field of multi-microgrid economic optimization, in particular to a day-ahead economic optimization method for single-three-phase mixed-connection multi-microgrid considering unbalance degree constraints. Background technique [0002] A microgrid is a small power generation and distribution system that organically integrates distributed power sources, loads, energy storage devices, converters, and monitoring and protection devices. With key technologies such as operation control and energy management of the microgrid, it can realize its grid-connected or island operation, reduce the adverse impact of intermittent distributed power on the distribution network, maximize the use of distributed power output, and ensure high power supply reliability performance and power quality. In the process of developing from microgrid to smart grid, multi-microgrid system has become a new research hotspot after single microgrid. The single...

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06
Inventor 杨苹张育嘉许志荣宋嗣博何婷郑成立
Owner SOUTH CHINA UNIV OF TECH
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