Bidirectional power flow strategy design of BLDC motor for flywheel energy storage

doi:10.19799/j.cnki.2095-4239.2022.0086

Abstract

Abstract:

Motor is the core of flywheel system to realize the mutual conversion of electric energy and mechanical energy. BLDC motor has the advantages of small volume, low noise and high economic benefit. It has been applied in energy storage. In order to avoid large winding loss during the charging and discharging process of the motor or introduce auxiliary circuit to stabilize the output voltage, based on the BLDC motor model applied to flywheel energy storage, a motor charging and discharging control strategy is proposed to change the turn-on and turn-off sequence of thyristor, change the winding back EMF and current flow direction, and realize the charging and discharging function of the motor. The simulation results show that the BLDC motor model can correctly represent the operating characteristics of the flywheel. It also shows that the proposed motor charge discharge control strategy can make the motor absorb power in the charging state, convert electric energy into flywheel kinetic energy, release power in the discharging state and convert flywheel kinetic energy into electric energy without introducing additional circuit topology, And the relevant electrical quantities are controllable in the process of charge and discharge, so as to realize the two-way flow process of power. The design of this control strategy provides a certain theoretical basis for the realization of mechatronics products of flywheel energy storage.

Key words: flywheel energy storage, bidirectional power flow, charge and discharge control strategy

CLC Number:

TM 33

Xiaojie YANG, Haiyun WANG, Zhongchuan JIANG, Zhanghua SONG. Bidirectional power flow strategy design of BLDC motor for flywheel energy storage[J]. Energy Storage Science and Technology, 2022, 11(7): 2233-2240.

Figures/Tables 13

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霍尔码	反电势值	导通相	桥臂导通
100	A正C负	AC相	A上C下
110	B正C负	BC相	B上C下
010	B正A负	BA相	B上A下
011	C正A负	CA相	C上A下
001	C正B负	CB相	C上B下
101	A正B负	AB相	A上B下

霍尔码	反电势值	导通相	桥臂导通
100	A正C负	CA相	C上A下
110	B正C负	CB相	C上B下
010	B正A负	AB相	A上B下
011	C正A负	AC相	A上C下
001	C正B负	BC相	B上C下
101	A正B负	BA相	B上A下

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