Voltage adjustment method, direct-current microgrid and computer readable storage medium

Abstract

The invention provides a voltage adjustment method, a direct-current microgrid and a computer readable storage medium. The method comprises the steps of determining an energy storage unit in a charging state as an energy storage target unit, and obtaining a voltage reference value, a current state-of-charge value, an influence coefficient and an average state-of-charge value corresponding to the energy storage target unit; determining a voltage adjustment value according to the influence coefficient, the voltage reference value, the state average value and the current state-of-charge value; obtaining output power corresponding to the energy storage target unit and a preset droop coefficient; constructing a corresponding relationship among the voltage adjustment value, the output power, thedroop coefficient and the bus voltage of the direct-current microgrid; and if it is determined that the current state-of-charge value is not in the preset range, adjusting the voltage reference valuebased on the corresponding relationship to adjust the bus voltage so as to enable the bus voltage to be within the preset voltage range. The service life of a battery corresponding to the energy storage unit in the direct-current microgrid is prolonged, and the stability and robustness of the direct-current microgrid are improved.

Description

Technical field[0001]The present invention relates to the field of microgrid, and more particularly to a voltage adjustment method, a DC microgrid, and a computer readable storage medium.Background technique[0002]In recent years, with the development of renewable energy, the micro-grid has been widely used. The microgrid is a small power system integrated into a centralized distributed energy and load in the region. It has become one of the solutions that use the renewable energy source with its flexible operating mode and controllability. Compared with the AC microgrid. DC microgrid reduces the exchange equipment and power conversion links and the DC microgrid does not have problems such as phase synchronization, reactive trend and harmonics. Therefore, DC microgrid is easy to control. Due to the uncertainty between the gap between the renewable energy and the load fluctuation, the energy storage battery needs to maintain the power of the power at the normal voltage level to meet t...

AI Technical Summary

Problems solved by technology

However, due to the difference between the energy storage unit batteries and the uneven power distribution during charging and discharging, the SOC (State Of Charge, state of charge) of the energy storage unit batteries is different, which may lead to overcharging or overdischarging of the energy storage unit batteries , which will not only reduce the life of the battery corresponding to the energy storage unit, but also reduce the stability of the DC microgrid

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