Study on primary frequency modulation capacity planning of thermal power unit assisted by hybrid energy storage based on EMD decomposition

doi:10.19799/j.cnki.2095-4239.2022.0588

Abstract

Abstract:

The new power grids with the high penetration of new energies are more prone to load imbalance between the generation side and the user side, resulting in fluctuations in the grid frequency, which brings great challenges to frequency safety. Improving the active frequency modulation support is an effective method for the generation side. The energy storage technology, which assists the thermal power units participating in the primary frequency regulation, can not only improve the safety of power grids, but can also reduce the wear of the units and for more economic unit operations. The existing configuration method of the primary frequency modulation energy storage capacity is relatively simple. Hence, a configuration method is proposed for the hybrid energy storage system to assist the thermal power frequency modulation, based on the empirical mode decomposition (EMD). By adopting the EMD, the hybrid energy storage system power obtained by the target power is processed, and the modal components obtained from the EMD decomposition are reconstructed to determine the energy storage power allocation. Moreover, the power and capacity planning is conducted, and the optimal optimization scheme of the hybrid energy storage system is determined by taking the whole life cycle cost of the hybrid energy storage as the optimization objective. Our proposed method makes up for the unreasonable energy storage configuration scheme without fully considering the high- and low-frequency response of power unit, the high investment cost of energy storage caused by the inability to fully utilize different forms of energy storage characteristics, the low income of energy storage system, and the unsatisfactory frequency modulation effect. Finally, the effectiveness and economic aspects of the above planning methods are verified using a specific example in Suqian. This study can provide some technical references for the planning of hybrid energy storage in the frequency modulation of thermal power units.

Key words: EMD, hybrid energy storage, capacity planning

CLC Number:

TM 712

Jie SONG, Linxiao GENG, Yongfu SANG, Rongbin WEN, Peng SUN, Linjuan GONG. Study on primary frequency modulation capacity planning of thermal power unit assisted by hybrid energy storage based on EMD decomposition[J]. Energy Storage Science and Technology, 2023, 12(2): 496-503.

Figures/Tables 10

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Table 1

Reconstruction scheme table"

序号	$I M F 1$	$I M F 2$	$I M F 3$	$I M F 4$	$I M F 5$	$I M F 6$	$I M F 7$	$I M F 8$	$I M F 9$	$I M F 10$
1	H	L	L	L	L	L	L	L	L	L
2	H	H	L	L	L	L	L	L	L	L
3	H	H	H	L	L	L	L	L	L	L
4	H	H	H	H	L	L	L	L	L	L
5	H	H	H	H	H	L	L	L	L	L
6	H	H	H	H	H	H	L	L	L	L
7	H	H	H	H	H	H	H	L	L	L
8	H	H	H	H	H	H	H	H	L	L
9	H	H	H	H	H	H	H	H	H	L

Table 1

Table 2

Energy storage capacity and power under different reconstruction schemes"

方案	$P H$ /MW	$P M L$ /MW	$E H$ /(kWh)	$E M L$ /(kWh)
重构方案1	5.42	9.58	69.80	167.13
重构方案2	9.36	9.56	103.47	163.89
重构方案3	9.36	7.96	145.57	154.63
重构方案4	9.38	7.96	114.93	154.62
重构方案5	9.32	5.68	61.23	121.01
重构方案6	8.96	5.68	109.03	125.46
重构方案7	8.83	3.71	174.57	82.41
重构方案8	8.92	2.59	202.44	57.53
重构方案9	9.07	2.55	220.98	42.63
单一飞轮	15.43	0	269	0
单一蓄电池	0	17.36	0	273

Table 2

Fig. 5

Table 3

Other parameters of hybrid energy storage"

参数	飞轮储能	蓄电池储能
充放电效率	0.90	0.8
运行成本系数	0.01	0.1
维护成本系数	0	0.02
处置成本系数	0.04	0.08
循环寿命	$10 a ①$	530
功率成本/(元/MW)	100000	150000
容量成本/(元/kWh)	25000	15000

Table 3

Table 4

Fig. 6

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