Hierarchical voltage sag mitigation scheme based on user-side energy storage systems and its economic analysis

doi:10.19799/j.cnki.2095-4239.2022.0255

Abstract

Abstract:

A hierarchical voltage sag mitigation scheme based on user-side energy storage systems (UESS) was proposed for premium power parks to improve the economic benefits of UESS located in industrial parks, in addition to improving the peak-shaving and valley-filling function of UESS, and economic analysis was conducted. First, the topology and control strategy of UESS were designed so that the UESS could perform the voltage sag mitigation function in addition to the conventional peak-shaving and valley-filling function. A hierarchical voltage sag mitigation scheme based on the coordination of UESS and dynamic voltage restorer (DVR) was proposed to avoid the possible negative impacts of switching between different control modes of UESS. In this scheme, the lowest power supply level does not contain any voltage sag compensation equipment. The medium level of power supply is provided by a single device, while the highest level of power supply is ensured by coordinating UESS and DVR. The effectiveness of the proposed hierarchical power supply scheme was verified by simulations conducted in PSCAD/EMTDC. Finally, the cost and benefit model of UESS was established, and economic analysis of the proposed hierarchical power supply scheme was conducted by comparing the conventional peak-shaving and valley-filling type UESS, demonstrating that the proposed scheme can significantly improve the economic benefit and shorten the payback period of UESS for users suffering from voltage sag.

Key words: user-side energy storage system, voltage sag, premium power park, hierarchical power supply, economic analysis

CLC Number:

TM 912

Kai DING, Jian ZHENG, Wei LI, Zengrui HUANG, Yi WANG, Yimin QIAN, Zixuan ZHENG, Qi XIE. Hierarchical voltage sag mitigation scheme based on user-side energy storage systems and its economic analysis[J]. Energy Storage Science and Technology, 2022, 11(10): 3381-3390.

Figures/Tables 9

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负荷类型	敏感度	供电等级
L1	低	Q1
L2	中	Q2
L3	高	Q3

参数	值	参数	值
额定容量	200 kVA	总谐波畸变率	≤ 3%
额定电压	380 V	开关频率	10 kHz
额定频率	50 Hz	连接模式	三相四线制
额定直流电压	765 V	功率因数	0.99
LCL滤波器参数(L₁, L₂, C)	100 μH, 30 μH, 60 μF	隔离变压器	50 kW, 400 V/400 V

项	7:00—9:00	9:00—15:00	15:00—20:00	20:00—22:00	22:00—23:00	23:00—7:00
电价/元	0.6707	0.9993	0.6707	1.2073	0.6707	0.3219
运行状态	待机	放电	充电	放电	待机	充电

参数	年均暂降次数/次
参数	0	0.5	1	2	3	4	5	6	7	8
净收益/万元	231.378	397.91	564.43	897.49	1230.55	1563.61	1896.67	2229.72	2562.78	2895.84
投资回收期/年	7.4	6.2	5.3	4.1	3.4	2.9	2.5	2.2	2.0	1.8

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