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A day-ahead optimization method for single-phase three-phase hybrid multi-microgrid considering unbalance constraints

An optimization method and multi-microgrid 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 three-phase unbalanced scheduling constraints, etc., so as to reduce three-phase unbalance degree, improve the effect of economic benefits

Active Publication Date: 2020-04-28
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 of the rapidly developing single-phase three-phase multi-microgrid, nor does it satisfy the scheduling constraints of three-phase unbalance

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  • A day-ahead optimization method for single-phase three-phase hybrid multi-microgrid considering unbalance constraints
  • A day-ahead optimization method for single-phase three-phase hybrid multi-microgrid considering unbalance constraints
  • A day-ahead optimization method for single-phase three-phase hybrid multi-microgrid considering unbalance constraints

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Embodiment Construction

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

[0028] figure 1 It is a flow chart of economic optimization of single-phase three-phase hybrid multi-microgrid, and its specific steps are as follows:

[0029] (1) Perform distributed single-microgrid economic optimization on each single-phase and three-phase microgrid, and obtain the optimal solution set G of the energy storage output of each single-microgrid 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 , which is converted into tie-line power values ​​and uploaded to the multi-microgrid central controller according to the phase sequence, and the unbalance constraint correction algorithm is completed in the central controller. The specific conversion proces...

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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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Patent Type & Authority Patents(China)
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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