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Title:
UNINTERRUPTIBLE POWER SYSTEM AND CONTROL METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2017/148150
Kind Code:
A1
Abstract:
An uninterruptible power system comprises: an energy storage battery (110); a monitoring circuit; a controllable switch (120); a grid-tied control circuit (130) comprising a harmonic and reactive current extraction circuit (132) and a current loop control circuit (134); an off-grid control circuit (140) comprising an outer voltage loop circuit (142) and an inner current loop circuit (144); a mode-switching switch (150); and an inverter (160). When the uninterruptible power system is in a grid-tied mode, the grid-tied control circuit (130) extracts, according to harmonic and reactive components in mains power, a harmonic and reactive compensation command signal, and performs, by means of closed-loop current control, reactive and harmonic compensation, thereby reducing loss of electric energy. In the grid-tied mode, the off-grid control circuit (140), while not involved in control operations, is still in an operating state, and thus provides a constant voltage on the basis of a voltage loop, outputs a voltage feedback signal, and outputs a current feedback signal to generate an off-grid control signal. When the system is switched from the grid-tied mode to an off-grid mode, the inverter (160) controls an output according to the off-grid control signal, thereby realizing seamless switching between the grid-tied mode and the off-grid mode. Also provided is a control method of an uninterruptible power system.

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Inventors:
ZHANG, Tao (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
YU, Wei (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
XU, Haibo (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
SU, Jianhui (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
MAO, Meiqin (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
ZHANG, Liuchen (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
Application Number:
CN2016/101470
Publication Date:
September 08, 2017
Filing Date:
October 08, 2016
Export Citation:
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Assignee:
EAST GROUP CO., LTD. (No.6 Northern Industry Road, Songshan Lake SCI & TECH Industry ParkDongguan, Guangdong 8, 523808, CN)
International Classes:
H02J9/04; H02J3/00
Foreign References:
CN105633959A2016-06-01
CN205489525U2016-08-17
CN102882237A2013-01-16
GB2287843A1995-09-27
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (Room 3901, No. 85 Huacheng Avenue Tianhe Distric, Guangzhou Guangdong 3, 510623, CN)
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