A FESS UPS based on quasi-PR control method

doi:10.19799/j.cnki.2095-4239.2019.0235

Abstract

Abstract:

A UPS system provides the requisite power for sensitive equipment. The performance of a UPS is dominated by its storage medium and power control. The flywheel energy-storage system (FESS) is more efficient, incurs lower maintenance costs, and is non-polluting than chemical batteries. There are three types of UPS configurations: on-line, off-line, and line-interactive. The off-line configuration has a simpler topology, lower cost, and higher efficiency than the line-interactive configuration, but it is disadvantaged by low dynamic response. This paper proposes an FESS UPS based on a quasi-proportional resonance (quasi-PR) control method with a SCR switch. Combined with quasi-PR and vector controls, the proposed UPS overcomes the shortcomings of the traditional off-line type, achieving both high dynamic response and high power quality. This paper presents the operation mechanism, quasi-PR control, and vector control at the motor/grid side. The good response and high power quality of the proposed UPS are validated in simulations and experiments.

Key words: FESS, UPS, quasi proportional resonance control, vector control

CLC Number:

TM 919

LYU Jingliang, JIANG Xinjian, ZHANG Xinzhen, SHENG Shuang. A FESS UPS based on quasi-PR control method[J]. Energy Storage Science and Technology, 2020, 9(3): 901-909.

Figures/Tables 14

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名称	参数	数值
电网	线电压U _ab_rms	380 V
电网	输入电抗器L _x	0.2 mH
负载	线性平衡负载	300 kW
	线性不平衡负载	200 kW
	非线性负载	200 kW
PMSM	ω _max	6000 r/min
	ω _min	3000 r/min
	转动惯量J	0.1 kg·m²

时间节点/s	动作
t=0	电网正常为负载供电
t=0.1	电网跌落至0.4 p.u.
t=0.1001	转换开关断开，UPS开始放电
t=0.32	电网恢复正常
t=0.3201	转换开关闭合，UPS开始充电

项目	数据
工作转速	3000～6000 r/min
额定功率	300 kW
放电时间	20 s
电机极对数	2
稳态电压调整率	±1%
瞬态电压调整率	-15%，+20%

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