A hybrid energy storage system energy management method combined with AGC frequency modulation of thermal power units

Abstract

The invention relates to an energy management method of a hybrid energy storage system combined with a thermal power unit for AGC frequency modulation. Aiming at the shortcomings of the thermal power unit’s weak ability to respond to AGC commands and strong randomness, a hybrid energy storage system is constructed with a flywheel and a lithium battery, and a method based on The stochastic model predictive control method of the Markov chain is used to manage the energy of the hybrid energy storage system, including the following steps: 1) According to the historical data of the response of the thermal power unit to the AGC command, the Markov chain is used to predict the future power demand of the hybrid energy storage system for modeling. 2) Select the future power demand of the hybrid energy storage system by generating a scenario tree. 3) The stochastic model predictive control is used to obtain the respective compensation power of the flywheel and lithium battery. This method is based on the historical unit power response characteristic data of the thermal power unit, which can improve the performance index of the thermal power unit (K P Value), at the same time, it can reasonably control the respective output power of the flywheel and lithium-ion battery, reduce the SOC fluctuation and power fluctuation of the flywheel and lithium battery, and prolong the life of energy storage.

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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