Title:
COMPRESSOR VARIABLE-FREQUENCY SPEED ADJUSTING SYSTEM AND CONTROL METHOD FOR DIRECT-CURRENT BUS VOLTAGE
Document Type and Number:
WIPO Patent Application WO/2021/244669
Kind Code:
A1
Abstract:
A compressor variable-frequency speed adjusting system and a control method for a direct-current bus voltage, comprising: a rectifier module, for converting an alternating-current input voltage into a direct-current bus voltage; an inverter module, for converting the direct-current bus voltage into an electric motor driving voltage; an electric motor, driven by the electric motor driving voltage to operate; and a control module, used for adjusting the direct-current bus voltage outputted by the rectifier module. When the electric motor is operating below a rated rotational speed, the direct-current bus voltage is outputted on the basis of the alternating-current input voltage; and, when the electric motor is operating over the rated rotational speed, the direct-current bus voltage is outputted on the basis of the alternating-current input voltage and of the rotational speed of the electric motor. The control method greatly reduces low-order harmonics of an electrical grid, increases system efficiency, and puts the variable-frequency speed adjusting system in the most efficient work mode.
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Inventors:
PU BOYU (CN)
GAN HONGJIAN (CN)
HE JINGFEI (CN)
AN WEIGUO (CN)
GAN HONGJIAN (CN)
HE JINGFEI (CN)
AN WEIGUO (CN)
Application Number:
PCT/CN2021/107064
Publication Date:
December 09, 2021
Filing Date:
July 19, 2021
Export Citation:
Assignee:
ZHEJIANG KEENWOO TECH CO LTD (CN)
International Classes:
H02M5/44; H02J3/01; H02P25/024; H02P27/06
Foreign References:
| CN111628660A | 2020-09-04 | |||
| CN102255586A | 2011-11-23 | |||
| CN110798123A | 2020-02-14 | |||
| CN111130366A | 2020-05-08 | |||
| CN103762828A | 2014-04-30 | |||
| CN103986339A | 2014-08-13 | |||
| US20180006498A1 | 2018-01-04 |
Attorney, Agent or Firm:
J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (CN)
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