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A modular DC microgrid structure reconstruction method and operation control method

A technology of DC micro-grid and module structure, which is applied in the direction of DC network circuit devices, AC network circuits, power transmission AC networks, etc., and can solve the problems of large one-time investment, interference and load fluctuation, and technical complexity of micro-grid projects. , to achieve the effect of facilitating the construction of microgrid, reducing the number of circuit breakers, and simplifying the control target

Active Publication Date: 2022-01-04
DALIAN UNIV OF TECH
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Problems solved by technology

The reason is that the DC microgrid lacks a large moment of inertia, resulting in too small output damping and low inertia, and is susceptible to frequent external interference and load fluctuations.
Among them, the most important thing is that the one-time investment of the microgrid project is large, the output is slow, and the technology is relatively complicated, so the internal demand for its construction and the driving force at the economic level are insufficient.

Method used

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  • A modular DC microgrid structure reconstruction method and operation control method
  • A modular DC microgrid structure reconstruction method and operation control method
  • A modular DC microgrid structure reconstruction method and operation control method

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Embodiment Construction

[0041] Combined with the accompanying drawings, the module division of the DC microgrid, the composition of the internal units of the module and the operation control method of the system are described in detail as follows:

[0042] The modularized DC microgrid is to divide the various components of the DC microgrid into units according to their own functions, and divide them into controllable units, uncontrollable units, and upper-level grid units, and then modularize each unit according to its geographic location and components. It is divided into module 1, module 2 and module 3, and the above modules are connected to the same DC bus through a generalized energy router. The generalized energy router is formed by the common bus of the converters of each module and the switch installed on the bus to isolate faults and module off-grid. It manages and detects the energy, operation mode and fault of the microgrid. Its information interaction function can The information about the...

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Abstract

A modular DC microgrid structure reconstruction method and operation control method. Based on the traditional energy router structure applied in AC and DC microgrids, the converters of each module in the modular DC microgrid are connected to the same DC On the bus, a generalized energy router structure is formed, which divides the operation of the system into three modes: grid-connected PQ mode, upper-level power grid participating control mode, and island mode. Based on the generalized energy router structure, a modular DC microgrid structure is realized. Relying on this structure Carry out information exchange, internal energy management, and promptly cut off faulty parts and perform structural reconstruction. The invention can reduce the number of circuit breakers in the DC microgrid, ensure the flexible and reliable operation of the DC microgrid to the greatest extent under any circumstances, ensure the minimum output of energy storage and large power grids, prolong the life of the battery and reduce the purchase of electricity from the large power grid. the cost of.

Description

technical field [0001] The invention belongs to the field of DC micro-grid modular structure and operation control, and relates to a modular DC micro-grid structure reconfiguration method and an operation control method thereof. Background technique [0002] In recent years, the proportion of distributed motors that can efficiently utilize clean energy in the power grid has gradually increased. Since the micro-grid is a system used to coordinate the contradiction between the large power grid and distributed power sources, it is the future intelligent power distribution system. It represents the development trend of the distributed energy power supply system in the future. Therefore, the National Energy Administration issued the "Guiding Opinions on Promoting the Construction of New Energy Micro-grid Demonstration Projects", "Action Plan for Construction and Transformation of Distribution Networks (2015-2020 "Notice" and other documents have greatly promoted the research and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/46H02J3/32H02J1/00H02J3/36H02H7/22
CPCH02J3/381Y02A30/60Y02E60/60
Inventor 孙辉于晓颖胡姝博吴昊周通高正男彭飞翔刘新宇孙宝硕杨帆范轩轩
Owner DALIAN UNIV OF TECH
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