A Coordinated and Stable Operation Control Method for an Island DC Microgrid

A DC micro-grid, stable operation technology, applied in the direction of AC network circuit, AC network load balancing, single-network parallel feeding arrangement, etc., can solve the DC bus voltage drop, do not consider the unmatched line impedance, and reduce the economy of the micro-grid and other problems to achieve the effect of eliminating bus voltage drop, improving stability and eliminating influence
CN110137992BActive Publication Date: 2020-09-01SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI UNIVERSITY OF ELECTRIC POWER
Publication Date
2020-09-01

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Abstract

The invention relates to a method for controlling the coordinated and stable operation of an isolated island DC micro-grid. By improving the double closed-loop control of the traditional converter and adopting the improved constant voltage droop control, a current inner loop control reference value is generated. In the current inner loop control, by introducing The SOC balance factor enables each energy storage unit to dynamically adjust the output current reference value of the current inner loop according to its own capacity and the current SOC, and finally realizes the SOC balance among the parallel energy storage units. Compared with the prior art, the present invention eliminates the influence of unmatched line impedance on the accuracy of current load distribution, and does not produce DC bus voltage drop similar to that caused by traditional droop control.
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Description

technical field

[0001] The invention relates to the field of direct current microgrids, in particular to a method for controlling the coordinated and stable operation of isolated island direct current microgrids. Background technique

[0002] Compared with the traditional AC microgrid, the DC microgrid does not need to consider voltage phase and frequency issues due to less energy conversion process, high efficiency, and low loss, so the controllability and reliability of the system operation are greatly improved; when the island is running, the microgrid It is necessary to rely on the coordinated control of distributed power sources in the self-network to maintain the stable operation of the microgrid. Compared with the grid-connected operation mode, the control is more complicated. Since the output of many renewable new energy sources such as photovoltaics and wind power is affected by external natural factors and presents intermittent, random and unstable characteristics,...

Claims

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