Application analysis of flywheel energy storage in thermal power frequency modulation in central China

doi:10.19799/j.cnki.2095-4239.2021.0277

Abstract

Abstract:

Because of its long operational life, high safety features, high power ratio, fast power response speed, and high control accuracy, flywheel energy storage is receiving ever more attention in the field of fire storage with combined frequency modulation. This paper analyzed the compensation policy of a thermal power plant frequency regulation in Central China. It obtained several key performance indexes of the flywheel energy storage that participated in fire storage with combined frequency modulation and conducted a performance test on a set of 500 kW/100 kW·h flywheel energy storage systems. According to the test results, the AGC command daily typical 300 MW thermal power unit data are combined, a set of control strategies that combined the frequency modulation of flywheel energy storage systems and thermal power units were designed. The compensation income of the frequency modulation was simulated and calculated. Compared with the compensation income obtained by a thermal power unit participating in FM only, the additional benefits obtained after increasing the flywheel energy storage system were analyzed. The conclusion was that flywheel energy storage reflected a good life-cycle economy in applying fire storage with combined frequency regulation.

Key words: flywheel energy storage system, fire storage combined frequency modulation, economic income

CLC Number:

TH 133

Xing ZHANG, Peng RUAN, Liuli ZHANG, Juan LI, Gangling TIAN, Dongxu HU, Baohong ZHU. Application analysis of flywheel energy storage in thermal power frequency modulation in central China[J]. Energy Storage Science and Technology, 2021, 10(5): 1694-1700.

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额定容量	调节范围下限(开机容量P_N的分数)	调节范围上限(开机容量P_N的分数)	调节速率V₀
100(含)～300 MW	66%	100%	1.5%P_N/min
300(含)～600 MW	50%	100%	1.5%P_N/min(直吹式制粉系统机组为1.2%P_N/min)
600 MW及以上	50%	100%	1.5%P_N/min(直吹式制粉系统机组为1.2%P_N/min)
燃机	50%	100%	3%P_N/min
火电全厂方式	50%	开机容量100%	1.5%P_N/min(直吹式制粉系统机组为1.2%P_N/min)

序号	规格参数	参数值
1	额定充放电功率/kW	250
2	储电量/(kW·h)	50
3	轮体自损耗/kW	<5

序号	测试项目	测试结果
1	功率响应时间	85.22 ms
2	功率控制精度	≤0.69%
3	充放电效率	83.23%

系统参数	初始值
火电机组额定功率	300 MW
火电机组功率调节速率	1.5%P_N/min，4.5 MW/min
火电机组调节补偿时间	10 s
火电机组功率控制精度	1%
电厂站用电电价	1元/kW·h
飞轮储能系统额定功率	9 MW
飞轮储能最大充放电量	1.8 MW·h
飞轮储能充放电效率	83.23%
飞轮储能系统功率控制精度	0.69%
飞轮储能系统初始SOC	50%
飞轮储能系统运行寿命	20年
飞轮储能系统年维护成本	50万元

参数	火储联合调频模式	火电机组独立调频模式
日调频补偿收益	52671.76元	17740.8元
电站用电支出	5876.02元	—