Journal
JOURNAL OF MODERN POWER SYSTEMS AND CLEAN ENERGY
Volume 10, Issue 2, Pages 450-458Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.35833/MPCE.2020.000177
Keywords
Renewable energy; distributed generation (DG); voltage regulator; load tap changer; distribution network
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Funding
- Government of Canada through the Program on Energy Research and Development (PERD), the Wind Energy Institute of Canada (WEICan)
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This paper investigates the impact of high penetration levels of RDG on the tap operation of ULTC in distribution networks and proposes various mitigation techniques. The constant power-factor mode is viewed as the best trade-off solution.
The integration of renewable distributed generation (RDC) into distribution networks is promising and increasing nowadays. However, high penetration levels of distributed generation (DG) are often limited as they may have an adverse effect on the operation of distribution networks. One of the operation challenges is the interaction between DG and voltage-control equipment, e. g., an under-load tap changer (ULTC), which is basically designed to compensate for voltage changes caused by slow load variations. The integration of variable DGs leads to rapid voltage fluctuations, which can negatively affect the tap operation of ULTC. This paper investigates the impact of high penetration levels of RDG on the tap operation of ULTC in distribution networks through simulations. Various mitigation techniques that can alleviate this impact are also examined. Among these techniques, constant power-factor mode is regarded as the best trade-off between the simplicity and effectiveness of minimizing the number of tap operations. Simulations are performed on a Canadian benchmark rural distribution feeder using OpenDSS software.
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