Title:
STRING OPTIMIZER HAVING SOFT-START FUNCTION, AND SOFT-START CONTROL METHOD USING SAME
Document Type and Number:
WIPO Patent Application WO/2023/101162
Kind Code:
A1
Abstract:
A string optimizer of the present invention is connected between a photovoltaic string and an inverter, which constitute a photovoltaic power generation system, so as to boost or bypass and output a voltage applied from the photovoltaic string, and comprises: a control unit for controlling operations of the string optimizer according to a preconfigured control algorithm; a first switch for controlling the amount of current input from the photovoltaic string under the on/off control of the control unit; a booster unit for boosting or bypassing and outputting the voltage transferred from the photovoltaic string; a second switch for controlling the boosting voltage of the booster unit under the on/off control of the control unit; and a first current sensor for sensing the output current of the string optimizer. The control unit adjusts the on/off time of the first switch unit until the output current value sensed by the first current sensor reaches a preconfigured inverter operation current value, thereby increasing the output current value in a preconfigured incremental unit. Accordingly, with reference to a low output value that is output during an initial operation, the current value that is input to an input end is gradually increased, thereby implementing a soft-start function. This is advantageous in that the occurrence of an inrush current can be suppressed.
Inventors:
PARK KI JU (KR)
LEE KYUNG MUN (KR)
LEE KYUNG MUN (KR)
Application Number:
PCT/KR2022/013826
Publication Date:
June 08, 2023
Filing Date:
September 15, 2022
Export Citation:
Assignee:
SMART POWER CO LTD (KR)
PARK KI JU (KR)
PARK KI JU (KR)
International Classes:
H02S50/00; H02H1/04; H02H3/08; H02H9/02; H02M1/00; H02S40/32
Foreign References:
| KR102281878B1 | 2021-07-26 | |||
| KR102318535B1 | 2021-10-28 | |||
| KR20130130428A | 2013-12-02 | |||
| KR20160075959A | 2016-06-30 | |||
| KR102406410B1 | 2022-06-08 |
Attorney, Agent or Firm:
DOOSUNG PATENT LAW FIRM (KR)
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