PQ변동을 이용한 개선된 계통 임피던스 추정기법

Title
PQ변동을 이용한 개선된 계통 임피던스 추정기법
Other Titles
An Improved Grid Impedance Estimation using PQ Variations
Author
김래영
Keywords
Grid impedance estimation; Grid connected inverter; Phase looked loop; PLL; PQ variations
Issue Date
2015-04
Publisher
전력전자학회
Citation
전력전자학회 논문지, v. 20, NO 2, Page. 152-159
Abstract
In a weak grid condition, the precise grid impedance estimation is essential to guaranteeing the high performance current control and power transfer for a grid-connected inverter. This study proposes a precise estimation method for grid impedance by PQ variations by employing the variation method of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative impact of the phase locked loop is analyzed. Estimation error by a synchronization angle in the park’s transformation using the phase locked loop is derived. As a result, the variation method of reference currents for accurate estimation is introduced. The validation of the proposed method is verified through several simulation results and experiments based on a 2-kW voltage source inverter prototype.
URI
http://koreascience.or.kr/article/ArticleFullRecord.jsp?cn=JRJJC3_2015_v20n2_152http://hdl.handle.net/20.500.11754/24081
ISSN
1229-2214; 2288-6281
DOI
10.6113/TKPE.2015.20.2.152
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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