General and Simple Decision Method for DG Penetration Level in View of Voltage Regulation at Distribution Substation Transformers

Il-Keun Song, Won-Wook Jung, Chul-Min Chu, Seong-Soo Cho, Hyun-Koo Kang and Joon-Ho Choi
Additional contact information
Il-Keun Song: Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105 Munji-Ro, Yuseong-Gu, Deajeon 305-760, Korea
Won-Wook Jung: Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105 Munji-Ro, Yuseong-Gu, Deajeon 305-760, Korea
Chul-Min Chu: Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105 Munji-Ro, Yuseong-Gu, Deajeon 305-760, Korea
Seong-Soo Cho: Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105 Munji-Ro, Yuseong-Gu, Deajeon 305-760, Korea
Hyun-Koo Kang: Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105 Munji-Ro, Yuseong-Gu, Deajeon 305-760, Korea
Joon-Ho Choi: Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Korea

Energies, 2013, vol. 6, issue 9, 1-13

Abstract: A distribution system was designed and operated by considering unidirectional power flow from a utility source to end-use loads. The large penetrations of distributed generation (DG) into the existing distribution system causes a variety of technical problems, such as frequent tap changing problems of the on-load tap changer (OLTC) transformer, local voltage rise, protection coordination, exceeding short-circuit capacity, and harmonic distortion. In view of voltage regulation, the intermittent fluctuation of the DG output power results in frequent tap changing operations of the OLTC transformer. Thus, many utilities limit the penetration level of DG and are eager to find the reasonable penetration limits of DG in the distribution system. To overcome this technical problem, utilities have developed a new voltage regulation method in the distribution system with a large DG penetration level. In this paper, the impact of DG on the OLTC operations controlled by the line drop compensation (LDC) method is analyzed. In addition, a generalized determination methodology for the DG penetration limits in a distribution substation transformer is proposed. The proposed DG penetration limits could be adopted for a simplified interconnection process in DG interconnection guidelines.

Keywords: on-load tap changer (OLTC); distributed generation (DG); line drop compensation (LDC); penetration limits; interconnection standards/guidelines (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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