Design and operating characteristics of a grid-connected motor-converting system for gravity/flywheel integrated energy storage

doi:10.19799/j.cnki.2095-4239.2022.0386

Abstract

Abstract:

This study proposed an integrated physical energy storage system design and control strategy with gravity energy storage as the main and flywheel energy storage as an auxiliary to smooth the fluctuation and intermittency of discharge caused by multi-weight switching in a gravitational energy storage system based on a skip hoist. First, the study evaluates the working principle, control methods of gravitational energy storage system and flywheel energy storage system, and critical components, such as motor/generator and converter, and further constructs gravitational and flywheel energy storage motor grid-connected system model. Then, the study simulates and analyzes the variation of parameters including the phase voltage and phase current on the machine side and network side of two kinds of energy storage system at charge: stand-by and grid-connected stages. Finally, the study constructs the simulation model of the integrated physical energy storage system, carries out the research on the matching operation characteristics of the two energy storage systems, designs the energy management and control strategy of the integrated energy storage system, and simulates its operating characteristics at different operating stages to verify the feasibility of the structure and control strategy of the integrated physical energy storage system.

Key words: gravity energy storage system (GESS), flywheel energy storage system (FESS), integrated grid-connected control, operating characteristic

CLC Number:

TK 02

Yongming ZHAO, Qingquan QIU, Zipan NIE, Xiaoyue LUO, Liye XIAO. Design and operating characteristics of a grid-connected motor-converting system for gravity/flywheel integrated energy storage[J]. Energy Storage Science and Technology, 2022, 11(12): 3895-3905.

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参数	数值	参数	数值
额定电压/V	380	d- q轴电感/mH	18.5
额定电流/A	15	磁链/Wb	0.867
额定转矩/(N ·m)	700	相电阻/Ω	0.5
额定转速/(r/min)	100	黏滞摩擦系数/[N ·m/(rad/s)]	0.00049
转动惯量/(kg ·m ²)	5.1	极对数	9

参数	数值
直流母线电压参考值/V	700
网侧相电压有效值/V	220
网侧电压频率/Hz	50
直流侧稳压电容/μF	2000
L_g/mH	1.0
L_conv/mH	1.5
C/μF	1.0

参数	数值	参数	数值
额定电压/V	380	d轴电感/mH	0.102
额定电流/A	16.5	q轴电感/mH	0.292
相电阻/Ω	0.04	磁链/Wb	0.54
额定转速/(r/min)	3600	黏滞摩擦系数/[N ·m/(rad/s)]	0.00010
转动惯量/(kg ·m ²)	1.2	极对数	2

参数	数值	参数	数值
直流母线电压/V	700	网侧电压频率/Hz	50
网侧相电压有效值/ V	220	直流稳压电容/μF	2000
L_g/mH	1.0	C/μF	1.0
L_conv/mH	1.5	P^*/kW	10

参数	数值
GESS模型竖井深度/m	5
GESS模型吊具和重物总质量/kg	1000
GESS电机功率/kW	10
GESS减速箱减速比例	5∶1
FESS电机功率/kW	10
FESS储能量/kJ	50