A Novel P-Q Variation Method using a Decoupled Injection of Reference Currents for a Precise Estimation of Grid Impedance
- Title
- A Novel P-Q Variation Method using a Decoupled Injection of Reference Currents for a Precise Estimation of Grid Impedance
- Author
- 김래영
- Keywords
- Impedance; Estimation; Voltage measurement; Phase locked loops; Current measurement; Vectors; Inverters
- Issue Date
- 2014-09
- Publisher
- IEEE
- Citation
- Energy Conversion Congress and Exposition (ECCE), 2014 IEEE, 2014 Sept[2014], P.5059-5064
- 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.
- URI
- http://ieeexplore.ieee.org/document/6954095/http://hdl.handle.net/20.500.11754/52707
- ISBN
- 978-1-4799-5776-7
- ISSN
- 2329-3721; 2329-3748
- DOI
- 10.1109/ECCE.2014.6954095
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRICAL AND BIOMEDICAL ENGINEERING(전기·생체공학부) > Articles
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