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Distributed coordination control method for DC micro-grid

A DC micro-grid, distributed coordination technology, applied in the direction of load balance, DC network circuit devices, electrical components, etc. High cost and other issues, to achieve the effect of maximum consumption, multi-objective coordinated control, and small communication burden

Pending Publication Date: 2019-09-20
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Centralized control uses the controllable units in the system to uniformly send and receive status instructions to the central controller, which requires high stability of the communication network and leads to high operating costs of the system, and the high penetration rate of distributed power and the microgrid Scalability makes the traditional centralized optimization and coordination management lack of flexibility and scalability

Method used

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  • Distributed coordination control method for DC micro-grid
  • Distributed coordination control method for DC micro-grid
  • Distributed coordination control method for DC micro-grid

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Embodiment

[0052] figure 1 The DC microgrid structure used in the present invention consists of figure 1 It can be seen that the DC microgrid mainly includes distributed generation units, energy storage units and load units. The DC microgrid is connected to the main grid through a static transfer switch (STS), so the DC microgrid can work in two modes: grid-connected mode and island mode. In this invention, only the DC microgrid is considered to work in the island mode. The DC microgrid structure is divided into two layers, the communication structure and the physical structure. The communication structure is composed of agents corresponding to the control units, and the physical structure is composed of the control units in the power grid. Each agent can receive and sample the instructions and information of the corresponding local physical unit and its neighbor units, and iterate in the agent after receiving the corresponding information, so as to update the information of the local p...

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Abstract

The invention relates to a distributed coordination control method for a DC micro-grid, comprising the following steps of S1: establishing a total generation cost function of a DC micro-grid system according to distributed generation in the DC micro-grid system in combination with a supply and demand balance condition and a capacity constraint; S2: acquiring and initializing, by each power generation unit and its agent controller, local information; S3: solving the generation cost function by using an improved multi-agent consistency algorithm, obtaining the cost incremental rate and the output power of each unit, and stabilizing a DC bus voltage; S4: iterating the algorithm at the next moment, processing the obtained information, and finally outputting the optimal power; and S5, performing distributed coordinated scheduling control on the DC micro-grid by using the optimal power. Compared with the prior art, the method has the advantages of simultaneously achieving minimum generation cost, stabilizing the bus voltage and maintaining power balance, and maximizing the utilization of renewable energy.

Description

technical field [0001] The invention relates to the technical field of energy coordinated control of DC microgrids, in particular to a distributed coordinated control method for DC microgrids. Background technique [0002] As the penetration rate of a large number of new energy power generation in the traditional power grid continues to increase, micro-grid technology has emerged as the times require. Microgrid technology is a small power generation and distribution system that organically integrates distributed power sources, loads, and energy storage devices. At present, most of the research on micro-grids is concentrated on AC micro-grids, but most of the electric energy generated by new energy generation units such as photovoltaics and wind power is DC. The use of DC micro-grids not only saves AC-DC conversion devices, but also reduces costs and losses. , and there are no problems such as frequency stability and reactive power in the grid, so the research on the DC micr...

Claims

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Application Information

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IPC IPC(8): H02J1/00H02J1/14
CPCH02J1/00H02J1/14
Inventor 于艾清丁雨
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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