Microgrid system and control method

A micro-grid and control cabinet technology, applied in the field of micro-grid, can solve problems such as unbalanced calculation errors, achieve high current sharing accuracy, good scalability, and realize the effect of orderly parallel connection
CN110943483AActive Publication Date: 2020-03-31SHANDONG LUNENG SOFTWARE TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANDONG LUNENG SOFTWARE TECH
Publication Date
2020-03-31

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Abstract

The invention discloses a microgrid system and a control method. The microgrid system comprises a plurality of energy storage converters connected in parallel between a DC bus and an AC bus; the AC sides of the energy storage converters are connected in parallel through an AC bus and then connected with the grid-connected or parallel control cabinet; the grid-connected or parallel-connected control cabinet receives an instruction of a coordination control device of the microgrid and controls the microgrid to work in a grid-connected mode or an off-grid mode; the grid-connected or parallel-connected control cabinet obtains a current component reference value of a current inner loop through outer loop control, and sends the obtained current component reference value to each energy storage converter connected in parallel; and each energy storage converter performs current inner loop operation according to the received current component reference value to obtain a driving signal for driving the switching tube of the energy storage converter to be switched on and switched off. According to the method, the information processing speed of the microgrid during information processing can beincreased, Meanwhile, the problems of respective sampling of each energy storage converter in the microgrid energy storage system and imbalance of outer loop calculation errors can be effectively eliminated.
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Description

technical field

[0001] The invention relates to the technical field of micro-grids, in particular to a micro-grid system and a control method. Background technique

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Micro-Grid refers to a small power generation and distribution system composed of distributed power sources, energy storage systems, energy conversion devices, loads, monitoring and protection devices, etc. Because the microgrid has the advantages of low operating cost and less pollution, it has been widely used in real life.

[0004] Since the microgrid often needs to switch between the grid-connected operation mode and the off-grid operation mode, the control strategy and response speed of the microgrid are particularly important. However, in the prior art, most of the coordinated control devices of the microgrid are in a centralized control mode, ...

Claims

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