An improved droop control method for DC microgrid based on state of charge balance

Abstract

The invention discloses an improved droop control method for a DC micro-grid based on state of charge balance, which controls the output power of each energy storage system in a DC micro-grid by using a droop control method through a dynamic droop coefficient; wherein the dynamic droop coefficient is based on each The real-time state of charge parameters of the energy storage system are determined to follow its variation coefficient. The invention has the advantages of fully considering the losses caused by the charging and discharging of the energy storage units, and realizing the precise power distribution of each energy storage unit according to their respective states of charge; using the droop coefficient that changes according to parameters such as SOC to control, so that the control of each energy storage unit The power of the energy modules is more reasonable and appropriate to maintain the balance of system capabilities.

Description

technical field [0001] The invention relates to the technical field of DC microgrids, in particular to an improved droop control method for energy storage units in DC microgrids based on state-of-charge balance. Background technique [0002] At present, more and more new energy generation methods, energy storage devices and loads use DC power, so DC microgrids have attracted widespread attention. Photovoltaic is the most widely used new energy power generation method in DC micro-grid, and it has become a trend to improve the comprehensive utilization of photovoltaic and the overall efficiency of the system. Due to the intermittent, random and fluctuating output power of photovoltaic power generation, if only adjusting the photovoltaic itself will reduce its power utilization rate, which will seriously limit its flexibility. In order to reduce the operating cost of the system, renewable energy, as the energy supply equipment in the system, usually operates at the maximum pow...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide an improved droop control method for the DC microgrid based on state of charge balance, so as to solve the inconsistency of the initial state of charge of each energy storage unit in the prior art. In the process, power distribution cannot be carried out in an appropriate proportion, resulting in system energy imbalance, damage to energy storage equipment, etc.

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