A novel P-Q variations method using a decoupled injection of reference currents for a precise estimation of grid impedance
- Authors
- Cho, Je-Hee; Choi, Ki-Young; Kim, Yong-Wook; Kim, Rae-Young
- Issue Date
- Nov-2014
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Citation
- 2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014, pp.5059 - 5064
- Indexed
- SCOPUS
- Journal Title
- 2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014
- Start Page
- 5059
- End Page
- 5064
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143959
- DOI
- 10.1109/ECCE.2014.6954095
- Abstract
- In a weak grid condition, the precise grid impedance estimation is essential to guaranty the high performance current control and power transfer for a grid-connected inverter. This paper proposes a precise estimation method for grid impedance by P-Q variations employing a decoupled injection of reference currents. The operation principle of grid impedance estimation is fully presented, and the negative impacts of the Phase Locked Loop are analyzed. The estimation error by a synchronization angle in the park's transformation using the Phase Locked Loop is derived and as a result, the variation method of reference currents for accurate estimation is introduced. The validation of the proposed method is verified by mathematical expressions and several simulation results.
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