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Stochastic Analysis-Based Volt-Var Curve of Smart Inverters for Combined Voltage Regulation in Distribution Networks

Authors
Lee, DongwonHan, ChangheeJang, Gilsoo
Issue Date
5월-2021
Publisher
MDPI
Keywords
distribution network; photovoltaic generation; stochastic analysis; volt-var curve
Citation
ENERGIES, v.14, no.10
Indexed
SCIE
SCOPUS
Journal Title
ENERGIES
Volume
14
Number
10
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128187
DOI
10.3390/en14102785
ISSN
1996-1073
Abstract
The proliferation of renewable energy resources (RES), especially solar photovoltaic (PV) generation resources, causes overvoltage and line overloading in distribution networks. This study proposes a two-level volt-var control method based on multiple timescales. The on-load tap changer (OLTC) operates on an hourly timescale, to regulate the voltage on the secondary winding. In the 15-minutes timescale, PV-connected smart inverters and static var compensators (SVCs) are obliged to compensate the reactive power for the voltage control at the point of common coupling. In the multi-timescale voltage control framework, this study proposes a new multi-sectional volt-var curve (MSVVC) of a PV inverter. The objective of the MSVVC is to minimize the energy loss in the network, improve the voltage profile, and obtain the operational margin of other reactive power compensation devices. In the process of determining the optimal parameters of the MSVVC, stochastic modeling-based load flow analysis is utilized to consider the intermittency and uncertainty of RES generation. The effectiveness of the proposed method is verified on the IEEE 33-bus system in comparison with the conventional volt-var curve cases.
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공과대학 (전기전자공학부)
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