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Title:
COMPRESSOR FREQUENCY CONVERSION SPEED REGULATION SYSTEM AND DIRECT CURRENT BUS VOLTAGE OVERVOLTAGE PROTECTION METHOD
Document Type and Number:
WIPO Patent Application WO/2021/254530
Kind Code:
A1
Abstract:
Provided are a compressor variable-frequency speed regulation system and a direct-current bus voltage overvoltage protection method, comprising: during the process of motor speed regulation, setting a direct-current bus voltage given value on the basis of the motor rotational speed, and controlling a direct-current bus voltage actual value to track the direct-current bus voltage given value; setting a direct-current bus voltage limiting point to follow the direct-current bus voltage given value and be larger than the direct-current bus voltage given value, and setting a direct-current bus voltage limiting recovery point to follow the direct-current bus voltage given value and be smaller than the direct-current bus voltage given value; when the direct-current bus voltage actual value is larger than or equal to the direct-current bus voltage limiting point, controlling a power switch to stop operating until the direct-current bus voltage actual value is smaller than or equal to the direct-current bus voltage limiting recovery point, and controlling the power switch to resume operating. The present invention increases system efficiency, reduces the risk of direct current bus energy storage capacitor and power switch faults, decreases rectification module and inversion module loss during light loads, and prevents mistaken power switch turn-off.

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Inventors:
PU BOYU (CN)
GAN HONGJIAN (CN)
HE JINGFEI (CN)
AN WEIGUO (CN)
Application Number:
PCT/CN2021/107061
Publication Date:
December 23, 2021
Filing Date:
July 19, 2021
Export Citation:
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Assignee:
ZHEJIANG KEENWOO TECH CO LTD (CN)
International Classes:
H02P29/024; H02H7/09; H02P25/024; H02P27/06; H02P29/032
Foreign References:
CN111800064A2020-10-20
CN102255586A2011-11-23
CN1603996A2005-04-06
CN101902122A2010-12-01
CN206211525U2017-05-31
CN105471361A2016-04-06
US20190131877A12019-05-02
Attorney, Agent or Firm:
J.Z.M.C. PATENT AND TRADEMARK LAW OFFICE (CN)
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