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Hybrid microgrid system with many DC sub-networks and control method of hybrid microgrid system

A multi-DC sub-grid technology, which is applied in the direction of parallel operation of DC network circuit devices, AC network circuits, and DC power supplies, can solve problems such as the long development time of AC micro-grids and the inability to be replaced by DC micro-grids.

Active Publication Date: 2017-08-29
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the long development time of the AC microgrid, its status cannot be replaced by the DC microgrid, so there is a situation where the AC microgrid and the DC microgrid coexist.

Method used

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  • Hybrid microgrid system with many DC sub-networks and control method of hybrid microgrid system
  • Hybrid microgrid system with many DC sub-networks and control method of hybrid microgrid system
  • Hybrid microgrid system with many DC sub-networks and control method of hybrid microgrid system

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Embodiment Construction

[0135] The technical content of the present invention will be further described below in combination with specific implementation methods and accompanying drawings.

[0136] Such as figure 1 As shown, a hybrid microgrid system with multiple DC sub-microgrids includes a photovoltaic DG with a capacity of 10KW, an energy storage DG with a capacity of 10KW, a vehicle power DG with a capacity of 10KW, and an AC micro-source power generation system with a capacity of 10KW. The local load is a variable load, 5KW DC important load and 5KW AC important load.

[0137] The DC side of interconnected power converter A is connected to the bus bar of the DC subnet composed of photovoltaic DG, and the AC side is connected to the bus bar of the AC microgrid; the DC side of interconnected power converter B is connected to the DC subnet composed of energy storage DG, and the AC side is connected to the AC microgrid bus Grid busbar connection; the DC side of the interconnected power converter C...

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Abstract

The invention discloses and belongs to the technical field of a hybrid microgrid system, and provides an AC-DC hybrid microgrid system containing a plurality of DC sub-networks and a control method of the AC-DC hybrid microgrid system. In structure, effective integration of a photovoltaic power generation system, an energy storage system, an electromobile and an AC microsource is achieved, and the reliability and the stability of the interior of a microgrid are improved; and moreover, the plurality of DC sub-networks are connected with AC bus in a start shape by respective interconnection power converters to form a reasonable power supply layout with AC sub-networks. According to the control method, ESO current feedforward control based on an expansion state observer is performed on the condition that an extra hardware sensor is not needed, the stability of the system is simultaneously ensured, and the plug-and-play characteristic of a distributed microsource in the hybrid microgrid can also be met; the power flowing for equalization between each DC sub-microgrid and the AC microgrid is coordinated, and the continuous running of the whole system is maintained; in an island model, all important loads are all connected to the AC microgrid; and when an output power is insufficient, the important loads are enabled not to be powered off.

Description

technical field [0001] The invention belongs to the technical field of hybrid microgrid systems, in particular to a hybrid microgrid system with multiple DC subnets, and also to a control method for the hybrid microgrid system. Background technique [0002] A microgrid is a small power network formed by a collection of distributed power generation units, local loads, and energy storage systems according to a certain topology to make better use of their advantages. This power network has independent management, protection, and control capabilities. It is an autonomous power system based on new energy power generation technology and dominated by low-inertia power electronic devices. They can be connected to the main grid or run "islanded". At present, microgrids mainly exist in the form of AC, but as researchers study the stability, practicability, economy and sea wind power generation of DC microgrids, they find that the establishment of DC microgrids has huge commercial and...

Claims

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Application Information

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IPC IPC(8): H02J3/02H02J3/38H02J3/24H02J1/10
CPCH02J1/082H02J1/10H02J3/001H02J3/02H02J3/24H02J3/382H02J3/388H02J2203/20Y02A30/60Y02E10/56
Inventor 闫士杰李叶青高文忠周建勋
Owner NORTHEASTERN UNIV
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