Island AC-DC hybrid microgrid group power cooperative control method

Abstract

The invention relates to an island AC-DC hybrid microgrid group power cooperative control method, which comprises the steps of constructing a V2-P droop control strategy for a DC sub-microgrid containing a constant-power load, constructing an SOC dynamic balance consistency control strategy for the energy storage sub-microgrid, constructing a sub-microgrid power exchange control strategy for the DC sub-microgrid, the AC sub-microgrid and the energy storage sub-microgrid, constructing a communication trigger control strategy based on the sub-microgrid power exchange control strategy, utilizinga V2-P droop control strategy, an SOC dynamic balance consistency control strategy and a traditional P-f droop control strategy to respectively control respective output power of the DC sub-microgrid,the energy storage sub-microgrid and the AC sub-microgrid, and acting the sub-microgrid power exchange control strategy and the communication trigger control strategy on the island AC-DC hybrid microgrid group so as to control power exchange and interconnection communication among the sub-microgrids. Compared with the prior art, power balance inside the sub-microgrids and between the sub-microgrids can be reliably achieved, and unnecessary interconnection communication can be reduced.

Description

technical field [0001] The invention relates to the technical field of AC-DC hybrid micro-grid control technology, in particular to a power coordinated control method for an island AC-DC hybrid micro-grid group. Background technique [0002] With the rapid development of distributed generation (DG) technology based on renewable energy such as photovoltaics, wind power, and ocean energy, microgrid technology that can effectively integrate DG technology has increasingly attracted the attention of relevant experts and scholars. Since a pure DC microgrid or AC microgrid cannot meet the needs of a high proportion of distributed energy access and DC loads, at the same time, a single microgrid has limited working capacity and weak anti-disturbance capability. Therefore, the isolated island AC-DC hybrid microgrid group composed of the respective advantages of AC and DC sub-microgrids has become an important research hotspot in the future research direction of microgrids. The isolat...

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Problems solved by technology

However, different energy storage units have different states of charge (SOC). In order to prevent the energy storage unit from quitting work prematurely due to overcharging or overdischarging, it is necessary to control the power of the energy storage sub-microgrid. The DC microgrid performs energy storage control without involving the isolated island AC / DC hybrid microgrid group

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