Title:
DIRECT-CURRENT CAPACITOR SYNCHRONOUS CONTROL SYSTEM FOR GRID-CONNECTED CONVERTER, AND CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2023/077740
Kind Code:
A1
Abstract:
The present invention relates to the technology of direct-current capacitor synchronous control, in particular to a direct-current capacitor synchronous control system for a grid-connected converter, and a control method. By means of the method, a terminal voltage and a terminal current of an inverter and a direct-current capacitor voltage are collected as input signals, real-time reactive power is obtained by means of a power calculation unit, and a direct-current control signal and a reactive control signal are respectively obtained by means of transformation. The direct-current control signal passes through a direct-current voltage regulator, so as to obtain a phase angle δ of an inner electric potential; the reactive power control signal passes through a reactive voltage controller, so as to obtain an amplitude E of the inner electric potential; and the phase angle δ and the amplitude E are coupled to obtain a reference voltage, and the reference voltage is subjected to a VSC link to control an inverter, so as to realize a closed loop of control, thereby realizing frequency control. By means of the control method, a direct-current capacitor voltage is used as an input, and an internal phase angle of a reference voltage is generated by means of a direct-current voltage controller, such that frequency synchronization of a system is realized, new energy actively participates in frequency modulation, voltage control is added, and the problems of frequency and voltage support, etc. are solved.
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Inventors:
SHANG LEI (CN)
HAN CHUNYI (CN)
DONG XUZHU (CN)
HAN CHUNYI (CN)
DONG XUZHU (CN)
Application Number:
PCT/CN2022/088665
Publication Date:
May 11, 2023
Filing Date:
April 24, 2022
Export Citation:
Assignee:
UNIV WUHAN (CN)
International Classes:
H02J3/38; H02J3/24; H02J3/42
Foreign References:
| CN114094621A | 2022-02-25 | |||
| CN103280842A | 2013-09-04 | |||
| CN107257141A | 2017-10-17 | |||
| US20170155247A1 | 2017-06-01 |
Attorney, Agent or Firm:
WUHAN KEHAO INTELLECTUAL PROPERTY ATTORNEYS(SPECIAL GENERAL PARTNERSHIP) (CN)
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