Determination of Estimation Accuracy of Voltage Profiles Required for Proper Voltage Control by On-Load Tap Changer in Distribution Systems

Riku Akasaka (), Ryoichi Hara, Hiroyuki Kita, Shuhei Sugimura and Toshiharu Kurihara
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Riku Akasaka: Power and Energy Systems Laboratory, Faculty of Information Science and Technology, Hokkaido University, Sapporo 060-0808, Japan
Ryoichi Hara: Power and Energy Systems Laboratory, Faculty of Information Science and Technology, Hokkaido University, Sapporo 060-0808, Japan
Hiroyuki Kita: Power and Energy Systems Laboratory, Faculty of Information Science and Technology, Hokkaido University, Sapporo 060-0808, Japan
Shuhei Sugimura: Meidensha Corp., Tokyo 141-6029, Japan
Toshiharu Kurihara: Meidensha Corp., Tokyo 141-6029, Japan

Energies, 2023, vol. 17, issue 1, 1-13

Abstract: The introduction of a large number of photovoltaic systems to distribution systems has increased the complexity of the voltage profile. It is thus necessary to manage voltage at a higher system level. For this purpose, the voltage profile of the distribution system can be calculated using state estimation and the voltage can be controlled based on the estimated values. Many methods for estimating voltage profiles using state estimation have been developed. However, the estimation accuracy of voltage profiles required for proper voltage control has not been discussed. If the assumed required estimation accuracy is too high, then more meters than necessary will be installed, unnecessarily increasing costs. Conversely, if the assumed required estimation accuracy is too low, voltage control equipment will not operate properly, and voltage violations may occur. Thus, it is important to determine the required estimation accuracy of voltage profiles for proper voltage control. In this paper, the estimation error of the voltage profile is expressed using a probability density function, and the estimation accuracy of voltage profiles required for proper voltage control is examined. A numerical case study was performed on a distribution network model with 2160 consumers, and revealed the following. To prevent voltage violations, an estimation accuracy of voltage profile that is approximately 10 times lower than that of the estimation accuracy based on current measurement equipment data is sufficient. To minimize the number of tap operations, an estimation accuracy needs to be improved by 70% compared with the estimation accuracy based on current measurement equipment data.

Keywords: state estimation; distribution system; voltage control; on-load tap changer; photovoltaics (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: 2023
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