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HUCC-based flexible interconnection multi-microgrid control method and system

A multi-microgrid and microgrid technology, applied in the direction of AC network circuits, single-network parallel feeding arrangements, electrical components, etc., can solve the problem of inability to switch control targets and operation modes, inability to maximize the consumption of distributed energy, and inability to adapt Requirements for flexible operation and other issues to achieve the effect of improving the stability of system operation and power quality, improving flexibility and reliability, and improving flexibility and coordination

Inactive Publication Date: 2018-06-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the strong coupling between micro-grids in the prior art, which is easy to interfere with each other, the operation mode is relatively simple, and the control dimension is limited, and it is impossible to effectively switch the control target and operation mode according to different operation scenarios; There are conflicts in the operation goals of the microgrid to a certain extent, it is impossible to maximize the consumption of distributed energy, and the operation control mainly focuses on the control of isolated island operation, which cannot meet the requirements of its flexible operation. A flexible interconnection based on HUCC is proposed. The multi-microgrid control method and system significantly improve the compatibility, flexibility and coordination of the multi-microgrid system

Method used

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  • HUCC-based flexible interconnection multi-microgrid control method and system
  • HUCC-based flexible interconnection multi-microgrid control method and system
  • HUCC-based flexible interconnection multi-microgrid control method and system

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Embodiment 1

[0021] The flexible aggregation and collaborative operation of the multi-microgrid system is based on its interface technology. PCC, as the interface of the traditional AC microgrid, cannot meet the requirements of multi-microgrid compatibility, flexibility and coordination. In order to solve the technical defects existing in the AC interconnection of multiple microgrids, this embodiment proposes a hybrid common connection unit (HUCC). The support function of the power grid improves the frequency and voltage stability of the multi-microgrid system; on the other hand, the flexible interconnection of each sub-microgrid is realized based on the DC interface, and the compatibility and control ability of the DC unit are fully utilized to improve the stability of the multi-microgrid system. Scalability and transient stability.

[0022] Such as figure 1 As shown, the hybrid public connection unit includes: energy conditioning equipment (ESS) controller, public connection busbar and ...

Embodiment 2

[0040] This embodiment relates to a flexible interconnection multi-micro-grid system control architecture including the above-mentioned hybrid public connection unit, such as figure 2 As shown, it specifically includes: the central layer, the interface layer and the micro-grid layer, wherein: the central layer takes the operation mode and target of the multi-micro-grid system as input, determines the objective function and constraint conditions of the operation, and coordinates the connection of the hybrid public connection unit of the interface layer mode and control mode; the interface layer determines the switch status, MMC controller control mode and ESS controller control method based on the instructions of the central layer, and the micro-grid layer is used to control distributed power supply, energy storage and The mode of operation of the link unit, providing v / f support or power balancing.

[0041] This embodiment relates to a multi-microgrid control system, such as ...

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Abstract

The invention provides a hybrid-unit-of-common-coupling-based flexible interconnection multi-microgrid control framework and method. The hybrid unit of common coupling comprises energy regulating equipment, a common connection bus, an AC bus connected with the common connection bus, an AC circuit breaker used for being connected with a public network, a DC bus, a modular multilevel converter and aDC circuit breaker used for being interconnected with sub-microgrids. The flexible interconnection multi-microgrid system control framework comprises a center layer, an interface layer, a microgrid layer and a multi-microgrid control system. According to the control framework and method, the computability and the control capacity of the DC unit can be fully exerted so that the control dimension can be extended, access of the distributed power supplies can be optimized and the flexibility and the coordination of the flexible interconnection multi-microgrid can be enhanced.

Description

technical field [0001] The present invention relates to a technology in the field of microgrid control, in particular to a flexible interconnection multi-microgrid control method and system based on a Hybrid Unit of Common Coupling (HUCC). Background technique [0002] The microgrid is composed of distributed power sources, loads, energy storage devices and protection control devices. It is an independent power generation and distribution system with independent control, protection and management. It has the characteristics of flexible, reliable and high-quality power supply. Multi-microgrids (Multiple Microgrids, MMGs) complete energy balance, mutual aid and other operational objectives in different operating scenarios through complementary coordination of multiple micro-grids. It is divided into distribution network management layer, centralized control layer and micro-grid control layer; but Existing microgrids are connected to the grid in an AC synchronous manner, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381H02J3/388
Inventor 黄文焘吴攀邰能灵余墨多张尔佳
Owner SHANGHAI JIAO TONG UNIV
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