Parameter Design of SOC Balance Control for MMC-BESS Engineering Applications

doi:10.11930/j.issn.1004-9649.202304076

Abstract

Abstract:

In view of the engineering application of MMC-BESS technology, this paper provides theoretical basis and practical steps and methods for SOC balance control parameter design from four dimensions of modulation, efficiency, submodule capacitor voltage balancing, and device selection. To improve the speed of SOC balance control, the SOC balance control method of setting different control parameters in sections between submodules in the bridge arm is proposed. Based on the proposed demonstration project, the control parameters are designed. In addition, the rationality of control parameter design and the effectiveness of segmented control parameters to accelerate SOC balance control are verified by simulation.

Key words: MMC-BESS, SOC balance control, parameter design, stability

Xuefen JIN, Jianhui JI, Lanfang LI, Qinan LI, Fan ZHANG, Xiong ZHAN, Junwei HUANG. Parameter Design of SOC Balance Control for MMC-BESS Engineering Applications[J]. Electric Power, 2023, 56(11): 168-176.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202304076

https://www.electricpower.com.cn/EN/Y2023/V56/I11/168

Figures/Tables 9

References 25

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名称		参数
交流并网线电压/kV		6
直流并网电压/kV		12
MMC-BESS单机功率/kW		8000
变压器容量/MW		9
电压变比（网/阀）/(kV·kV^–1)		10/6
短路阻抗/%		7.5
联结组别（网/阀）		DY0
IGBT型号		3300 V/1500 A
子模块额定电容电压/kV		1
单桥臂子模块数		12
额定总电流有效值/A		458
额定交流电流峰值/A		566
电容/mF		18
电池单体最高电压/V		3.5
电池单体最低电压/V		3
电池单体标称电压/V		3.2
电池容量规格/(A·h)		92
子模块电池能量/(kW·h)		122.47
储能系统总容量/(kW·h)		8817.87
电池簇额定工作电流/A		83.47
子模块单体数量P，S		1，416
子模块电池组总内阻/Ω		0.48
单桥臂连接电抗/mH		3
滤波电感值/mH		7

名称		参数
交流并网线电压/kV		6
直流并网电压/kV		12
MMC-BESS单机功率/kW		8000
变压器容量/MW		9
电压变比（网/阀）/(kV·kV^–1)		10/6
短路阻抗/%		7.5
联结组别（网/阀）		DY0
IGBT型号		3300 V/1500 A
子模块额定电容电压/kV		1
单桥臂子模块数		12
额定总电流有效值/A		458
额定交流电流峰值/A		566
电容/mF		18
电池单体最高电压/V		3.5
电池单体最低电压/V		3
电池单体标称电压/V		3.2
电池容量规格/(A·h)		92
子模块电池能量/(kW·h)		122.47
储能系统总容量/(kW·h)		8817.87
电池簇额定工作电流/A		83.47
子模块单体数量P，S		1，416
子模块电池组总内阻/Ω		0.48
单桥臂连接电抗/mH		3
滤波电感值/mH		7

S_OCpa	S_OCpb	S_OCpc	S_OCna	S_OCnb
0.883 3	0.9	0.9	0.9	0.9000

S_OCnc	S_OCa	S_OCb	S_OCc	S_OCBESS
0.9000	0.891 7	0.9	0.9	0.897 2

S_OCpa	S_OCpb	S_OCpc	S_OCna	S_OCnb
0.883 3	0.9	0.9	0.9	0.9000

S_OCnc	S_OCa	S_OCb	S_OCc	S_OCBESS
0.9000	0.891 7	0.9	0.9	0.897 2

ΔS_OCmax/%	K_p3	ΔS_OCmax/%	K_p3
10	1.0	3	3.7
5	2.0	2	5.7
4	2.6	1	11.5