Method for improving droop control in energy storage charge state

Abstract

The invention discloses a method for improving droop control in an energy storage charge state, and belongs to the field of distributed power supply optimal control. According to the method for improving droop control in the energy storage charge state, the energy storage charge state of a power supply system and active power and reactive power output by a power supply serve as known local information together, an active droop coefficient is dynamically set by utilizing the method for improving droop control, an initial active droop coefficient in a control strategy is finally determined by analyzing the influence of the active droop coefficient, and therefore a distributed power supply shares user loads according to self power generation margin. By means of the method for improving droop control in the energy storage charge state, the defect that droop control can not dynamically adjust power output according to the actual power generating capacity is overcome, and reasonable distribution of the loads can be effectively achieved according to the power generating capacity of the power supply.

Description

Technical field [0001] The invention belongs to the field of distributed power supply optimization control, and in particular relates to an improved droop control method taking into account the state of charge of energy storage. Background technique [0002] Microgrid is a small grid structure that can combine distributed generation (Distributed Generation, DG), energy storage, and load. The microgrid power supply mode provides a new direction for distributed generation technology, but at the same time it also puts forward new requirements for interface converter technology. Because the distributed power supply has the characteristics of slow response speed and small inertia, the anti-disturbance ability of the microgrid system as a whole is poor. When there is a power imbalance in the system, the frequency will change rapidly. Therefore, how to ensure that the controllable DG can respond quickly and distribute load fluctuations reasonably has become a key issue to ensure t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems that the existing traditional droop control strategy may encounter in actual engineering, the present invention proposes an improved droop control method that takes into account the state of charge of the energy storage system, and is used for the SOC (state of charge, state of charge) to dynamically correct the active power droop coefficient, so that each power source can reasonably bear the load according to its own power generation capacity, and can balance the SOC of each power source energy storage system through the setting of the active power droop coefficient, so as to meet the requirements of distributed power supply operation The actual needs in the process can be widely used in scientific research and engineering applications in the fields of microgrid control and operation

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