Method for coordinated distribution control of energy of hybrid energy storage system

Abstract

The invention, which belongs to the field of electrical theory and the new technical field, relates to a method for coordinated distribution control of energy of a hybrid energy storage system. According to the method, four inputs including a charging and discharging state and a charge state of a lithium battery energy storage unit, a charge state of a supercapacitor, and a power command being a current power demand and two outputs including charging and discharging reference powers of a lithium battery and a super capacitor energy storage unit are provided. An input variable is fuzzified, a membership function is determined, and the four inputs are converted into linguistic variables; various charge state combinations of the four inputs are analyzed, energy allocation priority levels aredetermined in different states, and then a corresponding fuzzy rule is made; the needed output is expressed by using the linguistic variables, so that the charge and discharge reference power value isexpressed; and then de fuzzification is carried out on the output variables to obtain an actual reference power. Therefore, the depth of charge and discharge is reduced, so that the service life losscost is reduced and the performance of the hybrid energy storage system is improved.

Description

technical field [0001] The invention belongs to the field of electrotechnical theory and new technology, and relates to an energy coordination distribution control method of a hybrid energy storage system. Background technique [0002] The gradual increase in the penetration rate of renewable energy power generation in the microgrid will bring problems such as wind curtailment, solar curtailment, and power quality degradation. Connecting the hybrid energy storage system to the microgrid is an effective measure to solve this problem. Existing research has solved the basic problem of energy allocation through the low-pass filter allocation strategy, but it has not considered the priority of energy allocation under different charge state combinations to allocate energy reasonably. At present, the research on the coordination and distribution of power and energy within the hybrid energy storage system is still in the stage of theoretical analysis, and it is rarely used in pract...

AI Technical Summary

Problems solved by technology

Existing research has solved the basic problem of energy allocation through the low-pass filter allocation strategy, but it does not consider the priority of energy allocation under different charge state combinations of the system, and allocate energy reasonably

At present, the research on the coordination and distribution of power and energy within the hybrid energy storage system is still in the stage of theoretical analysis, and it is rarely used in practical engineering. The existing problem is that there is no clear analysis of the priority of charging and discharging under different working conditions.

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