Integrated control strategy and economic evaluation of multi-type energy storage for power grid secondary frequency modulation

doi:10.19799/j.cnki.2095-4239.2023.0430

Abstract

Abstract:

To investigate the secondary frequency modulation scenario of the power grid, this study proposes the integrated control strategy of the battery energy storage with an extended service life and performs the economic evaluation of a multi-type energy storage to improve the frequency modulation economy. First, based on the area control error, a battery energy-conventional unit in the grid's secondary frequency modulation model is built to play the fast response characteristic of the energy storage frequency. Next, the battery energy storage system is divided into two parts with different charge and discharge characteristics for integration. The independent tracking frequency modulation power strategy is then proposed to reduce the influence of the frequent charge and discharge on the battery life during the frequency modulation process and extend the service life. Finally, a multi-type battery life curve is fitted. A battery energy storage life evaluation model and a life cycle cost model based on the rainflow-counting method are constructed to compare and analyze the economies of the multi-type battery energy storage under integrated control. The numerical examples based on the actual load disturbance show that the proposed integrated control strategy effectively extends the service life of the battery energy storage in the frequency modulation scenario. The service life is extended several times with lithium and lead-acid batteries. In conclusion, the life cycle cost is significantly reduced.

Key words: secondary frequency modulation, dual battery integrated control, rain counting method, full life cycle, service life

CLC Number:

TM 761

Chao XING, Jiajie XIAO, Peiqiang LI, Xinze XI, Zhiyu MAO, Qi GUO, Chunming TU. Integrated control strategy and economic evaluation of multi-type energy storage for power grid secondary frequency modulation[J]. Energy Storage Science and Technology, 2023, 12(10): 3265-3274.

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放电深度	电池
放电深度	锂电池	铅酸电池	镍氢电池
0.1	8000	3800	5200
0.2	5600	2850	2800
0.3	4500	2050	1830
0.4	4000	1300	1450
0.5	3600	1050	1010
0.6	3400	900	850
0.7	3150	750	680
0.8	3100	650	500
0.9	3000	600	420
1	2800	550	350

多项式系数	电池
多项式系数	锂电池	铅酸电池	镍氢电池
a	-220.2	119	-213.3
b	287.1	-27.54	358.9
c	58.43	-535.8	72.6
d	224.3	629.3	16.05
e	-804.6	-488	-750.2
f	3500	923.2	978.3

参数	数值	参数	数值
M	5	D	1
B	20	K_G	21
T_g	0.08	K_p	-0.822
T_b	0.01	K_i	-0.16
T_CH、T_RH	0.3、10	F_HP	0.5
I	0.1	γ_bres	0.04
T	10	η	0.95

调频效果指标	无储能	有储能
最大正向频率偏差/Hz	0.0337	0.0182
最小反向偏差/Hz	-0.0422	-0.0224
频率偏差绝对值平均值/Hz	0.0071	0.0041

电池类型	锂电池			铅酸电池			镍氢电池
电池类型	储能A	储能B	单储能控制	储能A	储能B	单储能控制	储能A	储能B	单储能控制
等效循环次数/次	3.362	3.337	14.318	1.770	1.518	8.278	1.687	1.4136	2.071
平均循环次数/次	3.350		14.318	1.644		8.278	1.550		2.071
日充放电量/kWh	67.255	61.011	128.266	67.255	61.011	128.266	67.255	61.011	128.266