Hybrid energy storage system energy management method for AGC frequency modulation in combination with thermal power generating unit

Abstract

The invention relates to a hybrid energy storage system energy management method for AGC frequency modulation in combination with a thermal power generating unit. A hybrid energy storage system is constructed through a flywheel and a lithium battery for the defects that the thermal power generating unit is weak in AGC instruction response capability and is high in randomness, and a random model prediction control method based on the Markov chain is provided for energy management of the hybrid energy storage system. The method comprises the following steps of 1) modeling future power requirements of the hybrid energy storage system by adopting the Markov chain according to historical data of a thermal power generating unit in response to an AGC instruction, 2) selecting future power requirements of the hybrid energy storage system by generating a scene tree. and 3) adopting random model predictive control to obtain respective compensation power of the flywheel and the lithium battery. According to the method, based on historical unit power response characteristic data of the thermal power unit, the performance indexes (KP values in two rules) of the thermal power unit can be improved, meanwhile, the respective output power of the flywheel and the lithium ion battery can be reasonably controlled, SOC fluctuation and power fluctuation of the flywheel and the lithium ion battery are reduced, and the energy storage life is prolonged.

Description

technical field [0001] The invention relates to an energy management method of a hybrid energy storage system combined with AGC frequency modulation of thermal power units, specifically a hybrid energy storage system constructed with flywheel energy storage and lithium-ion battery energy storage combined with thermal power units for AGC frequency modulation, and belongs to the technical field of thermal power AGC frequency modulation. Background technique [0002] Today, the gradual increase in the penetration rate of renewable energy has exacerbated the fluctuation of system frequency, and the adjustment of automatic power generation control commands is faster and more intense. Traditional frequency modulation thermal power units have limited frequency modulation capability, and frequent variable power operation aggravates the wear and tear of the unit and affects the life of the equipment. "Fire storage" combined frequency regulation is an effective way to improve the freq...

AI Technical Summary

Problems solved by technology

[0005] In short, when the above-mentioned existing technology uses the energy storage system to compensate the power of the thermal power unit, it does not consider the remaining power of the energy storage and the future power demand, resulting in frequent charging and discharging of the energy storage system, which has a great impact on the life of the energy storage. It is easy to exceed the limit, resulting in a decrease in the utilization rate of energy storage

FM performance suffers as a result

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