PQ변동을 이용한 개선된 계통 임피던스 추정기법An Improved Grid Impedance Estimation using PQ Variations
- Other Titles
- An Improved Grid Impedance Estimation using PQ Variations
- Authors
- 조제희; 김용욱; 김래영
- Issue Date
- Apr-2015
- Publisher
- 전력전자학회
- Keywords
- Grid impedance estimation; Grid connected inverter; Phase looked loop (PLL); PQ variations
- Citation
- 전력전자학회 논문지, v.20, no.2, pp.152 - 159
- Indexed
- KCI
- Journal Title
- 전력전자학회 논문지
- Volume
- 20
- Number
- 2
- Start Page
- 152
- End Page
- 159
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143547
- DOI
- 10.6113/TKPE.2015.20.2.152
- ISSN
- 1229-2214
- 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.
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