Multi-mode Control Method of Gravity Energy Storage DC Link Battery

doi:10.11930/j.issn.1004-9649.202309026

Abstract

Abstract:

Gravity energy storage is one of the important energy storage modes. However, due to its unique transient dynamic characteristics, it is necessary to construct a reasonable system topology and control method. In this paper, a multi-mode control method for the DC link of gravity energy storage is proposed. From the transient energy control perspective, the power match between battery energy storage and gravity energy storage is realized through dynamic analysis of the gravity energy storage system and delineation of the constraint conditions. The experimental results show that the proposed control method can significantly reduce the voltage rise of DC link in the case of input power fluctuation, reasonably allocate the power inside the gravity energy storage system, and improve the overall storage performance of the gravity energy storage system.

Key words: energy storage technology, gravity energy storage, electric drag, DC bus, voltage control

Jiayan HAN, Yanling LÜ, Chong ZHOU. Multi-mode Control Method of Gravity Energy Storage DC Link Battery[J]. Electric Power, 2024, 57(7): 66-73.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202309026

https://www.electricpower.com.cn/EN/Y2024/V57/I7/66

Figures/Tables 17

Fig.1 General structure of gravity energy storage system

Fig.2 Relationship between electromagnetic torque and load torque

Fig.3 System simulation model

Fig.4 Control model diagram

Fig.5 Inverter control strategy model

Fig.6 Battery control strategy

Fig.7 Mode control block diagram

Table 1 System parameters

参数	归一化标称值范围	标准值
输入功率 P_in/W	0~1	P_innom
重力储能功率 Ps/W	–1~1	P_innom
电池输入的功率 P_B/W	–1~1	P_innom
母线电压值 V_DC/V	0~1	V_DCnom
母线电压给定值 $ {\overset{\lower0.5 em\hbox{$\smash{\scriptscriptstyle\frown}$}}{V} _{{\text{DC}}}} $/V	＞0	V_DCnom
电机输出转矩 T/(kg·m)	0~1	T_max
重物转矩 T_G/(kg·m)	0.5	T_max

Fig.8 Input power, battery power, and motor power (case 1)

Fig.9 Torque and speed curve (case 1)

Fig.10 DC bus voltage (case 1)

Fig.11 Input power, battery power, and motor power (case 2)

Fig.12 Torque and speed curve (case 2)

Fig.13 DC bus voltage (case 2)

Fig.14 Input power, battery power, and motor power (case 3)

Fig.15 Torque and speed curve (case 3)

Fig.16 DC bus voltage (case 3)

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