Application and practice of a high-voltage cascaded energy storage system in thermal energy storage frequency controlling

doi:10.19799/j.cnki.2095-4239.2022.0241

Abstract

Abstract:

Under a "Double Carbon" goal, the vigorous development of renewable energy not only threatens the stable operation of the power grid but brings considerable demand for frequency controlling. Thermal energy storage frequency controlling, which as the high-quality frequency modulation resource was be extensive research. In the thermal energy storage frequency controlling project in Guangdong, the power control, power conversion efficiency, and response time and accuracy between the low-voltage parallel and high-voltage cascaded chemical energy storage systems were compared by testing the connections to the power grid, and the latter performed better. The high-voltage cascaded chemical energy storage system is beneficial for improving the stability and security of the project and is more competitive in the frequency modulation market. Based on the advantages of high-voltage cascaded chemical energy storage system and frequency modulation demand of the power plant, the largest thermal energy storage frequency controlling project in China was designed to improve the response in frequency controlling and research on control strategies to provide a reference for thermal energy storage frequency controlling projects.

Key words: energy storage, high-voltage cascaded, low-voltage parallel, thermal power unit with energy storage in frequency control, test of connection to power grid

CLC Number:

TM 62

Silin HUANG, Huabin XIAO, Changshu HUANG, Ziqi GUO, Junfeng WU, Hangxuan XIE. Application and practice of a high-voltage cascaded energy storage system in thermal energy storage frequency controlling[J]. Energy Storage Science and Technology, 2022, 11(11): 3583-3593.

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序号	比较内容	低压并联储能系统	高压级联储能系统
1	拓扑结构	简单	较复杂
2	PCS出口电压	低压(0.4 kV)	高压(6/10 kV)
3	系统损耗	大(有升压变压器损耗)	小(无升压变压器损耗)
4	占地面积	大	小
5	单位建设面积储能能量密度	低	高(约为低压方案1.3倍)
6	电芯一致性	差	较好
7	电池寿命	短	长
8	指令响应时间	长	短
9	系统稳定性	低	高

项目	项目A	项目B	项目C	项目D
机组容量	2×350 MW	2×350 MW	2×330 MW	2×330 MW
储能规模	10 MW/5 MWh	10 MW/10 MWh	9.45 MW/5.25 MWh	10 MW/5 MWh
PCS类型	高压级联	高压级联	低压并联	低压并联

项目类型	有功功率设定值	实测平均值/MW	控制精度^①	响应时间/s	调节时间/s
高压级联	-0.25P_N	-2.516	0.16%	0.371	0.475
	0.25P_N	2.455	0.45%	0.536	0.551
	-0.5P_N	-5.030	0.30%	0.511	0.533
	0.5P_N	4.948	0.52%	0.495	0.549
	-0.75P_N	-7.524	0.24%	0.605	0.631
	0.75P_N	7.562	0.62%	0.890	0.989
	-P_N	-10.154	1.54%	0.676	0.702
	P_N	10.028	0.28%	0.536	0.567

项目类型	有功功率设定值	实测平均值/MW	控制精度	响应时间/s	调节时间/s
高压级联	-0.25P_N	-2.522	0.22%	0.235	0.242
	0.25P_N	2.571	0.71%	0.280	0.286
	-0.5P_N	-5.097	0.97%	0.562	0.573
	0.5P_N	5.058	0.58%	0.194	0.224
	-0.75P_N	-7.518	0.18%	0.432	0.447
	0.75P_N	7.558	0.58%	0.304	0.326
	-P_N	-10.084	0.84%	0.237	0.263
	P_N	10.088	0.88%	0.474	0.489

项目类型	有功功率设定值	实测平均值/MW	控制精度	响应时间/s	调节时间/s
低压并联	-0.25P_N	-2.404	0.44%	1.177	1.725
	0.25P_N	2.402	0.42%	1.266	1.365
	-0.5P_N	-4.645	0.85%	1.400	1.441
	0.5P_N	4.854	1.37%	1.556	1.839
	-0.75P_N	-6.926	1.71%	1.373	1.476
	0.75P_N	7.164	0.81%	1.771	2.047
	-P_N	-9.297	1.62%	1.459	1.689
	P_N	9.277	1.83%	1.988	2.159