Droop control method and device for direct-current micro-grid and computer storage medium

Abstract

The invention relates to a droop control method and device for a direct current micro-grid and a computer storage medium, and the method comprises the steps: obtaining a first output current value of a converter corresponding to a current energy storage unit in real time, and obtaining a first charge state value of the current energy storage unit at the same time; calculating a first droop coefficient corresponding to the current energy storage unit according to the first output current value and the first charge state value; performing droop control on the current energy storage unit according to the first droop coefficient; and respectively calculating a corresponding first droop coefficient for each energy storage unit of the direct-current micro-grid by adopting the steps, and performing droop control. By means of the method, the size of the droop coefficient is changed in real time according to the charge state value of the current energy storage unit, the charge state values of all the energy storage units tend to be balanced finally, and the problems that the energy storage units are overcharged and overdischarged and the charge state values are unbalanced are solved.

Description

technical field [0001] The present invention relates to the technical field of DC microgrid energy storage, in particular to a droop control method, device and computer storage medium for DC microgrid. Background technique [0002] In recent years, people have proposed the concept of a DC microgrid, which consists of distributed power sources such as photovoltaics and wind turbines, energy storage systems, AC and DC loads, and converters and control systems connected to the AC grid. DC microgrid only has a balance relationship between DC bus voltage and active power, and the fluctuation of bus voltage reflects the power balance relationship in the system. Therefore, it is necessary to impose reasonable control on the energy storage system to achieve the purpose of suppressing bus fluctuations. The power distribution method of parallel energy storage units usually adopts droop control. Droop control is widely used because of its simple control structure, and it does not depen...

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Problems solved by technology

[0003] In order to solve the problem that the existing droop control method will lead to overcharge and overdischarge of the energy storage unit of the DC microgrid and the unbalanced state of charge value, the present invention provides a droop control method, device and device for the DC microgrid. computer storage media

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