Title:
HIGH-VOLTAGE CASCADE ENERGY STORAGE METHOD AND SYSTEM FOR ELIMINATING BATTERY CHARGE/DISCHARGE FREQUENCY-MULTIPLICATION CURRENT
Document Type and Number:
WIPO Patent Application WO/2023/142519
Kind Code:
A1
Abstract:
Provided in the present invention are a high-voltage cascade energy storage method and system for eliminating a battery charge/discharge frequency-multiplication current. The method comprises: a single-star connected high-voltage cascade energy storage power conversion step, involving: injecting a set triple-frequency common-mode voltage into a modulation voltage of a bridge arm of a converter, increasing a harmonic order in a direct-current bus current of a power module from double frequency to quadruple frequency, and directly superimposing the set triple-frequency common-mode voltage on the modulation voltage of the bridge arm; and a single-angle connected high-voltage cascade energy storage power conversion step, involving: injecting a set triple-frequency common-mode current into the bridge arm of the converter, increasing the harmonic order in the direct-current bus current of the power module from double frequency to quadruple frequency, calculating, according to the set triple-frequency common-mode current, a required triple-frequency common-mode voltage, and superimposing same on the modulation voltage of the bridge arm. The present invention can fundamentally eliminate a second harmonic current in a direct-current bus of a power module, such that the requirement of a system for a passive filter is reduced, which is beneficial to improving the power density of the system.
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Inventors:
CAI XU (CN)
SHI XIANQIANG (CN)
ZHANG CHEN (CN)
LIU CHANG (CN)
LI RUI (CN)
YANG RENXIN (CN)
WU XIQI (CN)
WANG HAN (CN)
SHI XIANQIANG (CN)
ZHANG CHEN (CN)
LIU CHANG (CN)
LI RUI (CN)
YANG RENXIN (CN)
WU XIQI (CN)
WANG HAN (CN)
Application Number:
PCT/CN2022/124270
Publication Date:
August 03, 2023
Filing Date:
October 10, 2022
Export Citation:
Assignee:
UNIV SHANGHAI JIAOTONG (CN)
International Classes:
H02M1/12; H02J3/32; H02J7/00; H02M7/5387
Foreign References:
| CN114865896A | 2022-08-05 | |||
| CN110048582A | 2019-07-23 | |||
| CN104135176A | 2014-11-05 | |||
| CN110829477A | 2020-02-21 | |||
| US20140103887A1 | 2014-04-17 |
Attorney, Agent or Firm:
DUAN & DUAN LAW FIRM (CN)
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