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Network structure and method of AC-DC hybrid modular microgrid based on hybrid energy storage

An AC-DC hybrid, DC microgrid technology, applied in the direction of AC network load balancing, single-network parallel feeding arrangement, etc., can solve the problem of seamless switching of microgrids, achieve friendly interaction and mutual support, and simplify networking. The effect of the access scheme, avoiding the need for complex control algorithms

Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology

However, this invention patent does not solve the problem of seamless switching of microgrid grid-connected / isolated dual modes

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  • Network structure and method of AC-DC hybrid modular microgrid based on hybrid energy storage
  • Network structure and method of AC-DC hybrid modular microgrid based on hybrid energy storage
  • Network structure and method of AC-DC hybrid modular microgrid based on hybrid energy storage

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0034] Such as figure 1 As shown, the topology of the modular AC-DC hybrid microgrid consists of an isolation transformer (or step-up transformer) 1, a grid-side converter 2, a DC bus 3, a filter circuit 4, a battery-supercapacitor hybrid energy storage system 5, a DC The microgrid unit 6, the microgrid side converter 7, and the AC microgrid unit 8 are composed.

[0035] The grid-side converter 2 is the external interface of the modularized AC-DC hybrid microgrid, and its AC side is connected in parallel with the large grid through the filter circuit 4 and the isolation transformer (or step-up transformer) 1 . When the modular microgrid is connected to the grid, the grid-side converter 2 controls to maintain the voltage stability of the DC bus 3, ensures the stable operation of the AC microgrid unit 8 and the DC microgrid unit 6, and controls the modular mic...

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Abstract

The invention discloses an AC / DC (Alternating Current / Direct Current) hybrid modularized microgrid network structure based on hybrid energy storage and a networking method of the structure. The AC / DC hybrid modularized microgrid network structure based on hybrid energy storage is characterized in that a back-to-back converter is connected in parallel to a grid-side converter and a microgrid-side converter by use of a DC bus, the AC side of the grid-side converter is connected to a large power grid orderly through a filter circuit and an isolation transformer, and the three-phase AC output end of the microgrid-side converter serves as an AC bus via an LC filter circuit. The AC / DC hybrid modularized microgrid network structure based on hybrid energy storage has the advantages that the modularized packaging of loads of a plurality of types and distributed power sources of a plurality of types in the AC / DC hybrid microgrid is realized and the modularized microgrid initiatively joins in the dispatching operation of the large power grid as an independently controllable power source / load unit, and moreover, due to reasonable design of the hybrid energy storage system structure and the connection manner thereof, seamless switching of two modes of grid connection and island becomes the natural attribute of the modularized microgrid without complex control algorithm.

Description

technical field [0001] The invention belongs to the technical field of microgrid networking and operation control, and in particular relates to an AC / DC hybrid microgrid modular networking structure and method based on hybrid energy storage technology. Background technique [0002] Microgrid is a new type of network structure, which is an effective way to realize the active distribution network. The emergence of microgrid will fundamentally change the way traditional grids cope with load growth. It will reduce energy consumption and improve power system reliability. There is great potential in terms of flexibility and flexibility. At present, microgrid technology has become the cutting-edge technology of power system development. The development and extension of microgrid can promote the large-scale access of distributed power and renewable energy, and make the transition from traditional grid to smart grid. [0003] A microgrid is a small power generation and distribution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32
Inventor 于芃孙树敏程艳张用李广磊赵鹏
Owner STATE GRID CORP OF CHINA
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