Title:
GRID VOLTAGE PHASE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/242163
Kind Code:
A1
Abstract:
A grid voltage phase detection device of the present invention may comprise: a d-q transformation unit which receives a three-phase signal and calculates same to become a d-axis signal and a q-axis signal; a phase signal calculation unit which calculates, from the d-axis signal and the q-axis signal, a signal for phase-locking a grid voltage; and a PR filter unit which is provided with a first filter having no change in size and phase at a rated frequency, a second filter having a 90-degree phase lead at the rated frequency, a third filter having a 90-degree phase lag at the rated frequency, and a fourth filter having no change in size and phase at the rated frequency, and which removes unbalanced components and harmonic components from the d-axis signal and the q-axis signal, calculated by the d-q transformation unit, and provides same to the phase signal calculation unit.
Inventors:
KIM HYUN JUN (KR)
SEO HAE WON (KR)
JEONG BYUNG HWAN (KR)
SEO HAE WON (KR)
JEONG BYUNG HWAN (KR)
Application Number:
PCT/KR2020/006762
Publication Date:
December 03, 2020
Filing Date:
May 25, 2020
Export Citation:
Assignee:
HYOSUNG HEAVY IND CORP (KR)
International Classes:
G01R25/00; H02J3/40
Foreign References:
| KR20090067570A | 2009-06-25 | |||
| JP2012252443A | 2012-12-20 | |||
| KR20140110595A | 2014-09-17 | |||
| KR101781817B1 | 2017-09-27 | |||
| KR20180057419A | 2018-05-30 |
Attorney, Agent or Firm:
SU INTELLECTUAL PROPERTY (KR)
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