Optimization of Voltage Unbalance Compensation by Smart Inverter

Shigenobu, Ryuto; Nakadomari, Akito; Hong, Ying-Yi; Mandal, Paras; Takahashi, Hiroshi; Senjyu, Tomonobu

doi:10.3390/en13184623

Open AccessArticle

Optimization of Voltage Unbalance Compensation by Smart Inverter

by

Ryuto Shigenobu

^1,*,†

,

Akito Nakadomari

^2,†

,

Ying-Yi Hong

^3,†

,

Paras Mandal

^4,†

,

Hiroshi Takahashi

^5,† and

Tomonobu Senjyu

^2,*

¹

Faculty of Engineering, Electrical and Electronics Engineering, Fukui University, 3-9-1 Bunkyo, Fukui-shi, Fukui 910-8507, Japan

²

Faculty of Engineering, University of the Ryukyus, 1 Senbaru, Nishihara-cho, Nakagami, Okinawa 903-0213, Japan

³

Department of Electrical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan

⁴

Department of Electrical and Computer Engineering, Power and Renewable Energy Systems (PRES) Lab, University of Texas at El Paso, El Paso, TX 79968, USA

⁵

Fuji Electric Co., Ltd., Tokyo 141-0032, Japan

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Energies 2020, 13(18), 4623; https://doi.org/10.3390/en13184623

Submission received: 16 July 2020 / Revised: 31 August 2020 / Accepted: 1 September 2020 / Published: 5 September 2020

(This article belongs to the Section A1: Smart Grids and Microgrids)

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Abstract

This paper presents a compensation method for unbalanced voltage through active and reactive power control by utilizing a smart inverter that improves the voltage unbalance index and detects an unbalanced state of voltage magnitude and phase, and thus enhances power quality by minimizing the voltage imbalance. First of all, this paper presents an analysis of a mathematical approach, which demonstrates that the conventional voltage unbalanced factor (VUF) using the symmetrical component cannot correctly detect the imbalanced state from index equations; and by only minimizing the VUF value, it cannot establish a balanced condition for an unbalanced state of the voltage profile. This paper further discusses that intermittent photovoltaic (PV) output power and diversified load demand lead to an unexpected voltage imbalance. Therefore, considering the complexity of unbalanced voltage conditions, a specific load and an PV profile were extracted from big data and applied to the distribution system model. The effectiveness of the proposed scheme was verified by comparing VUF indices and controlling the active and reactive power of a smart inverter through a numerical simulation.

Keywords: distribution system; k-means clustering; particle swarm optimization; smart inverter; symmetrical component; voltage unbalance

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MDPI and ACS Style

Shigenobu, R.; Nakadomari, A.; Hong, Y.-Y.; Mandal, P.; Takahashi, H.; Senjyu, T. Optimization of Voltage Unbalance Compensation by Smart Inverter. Energies 2020, 13, 4623. https://doi.org/10.3390/en13184623

AMA Style

Shigenobu R, Nakadomari A, Hong Y-Y, Mandal P, Takahashi H, Senjyu T. Optimization of Voltage Unbalance Compensation by Smart Inverter. Energies. 2020; 13(18):4623. https://doi.org/10.3390/en13184623

Chicago/Turabian Style

Shigenobu, Ryuto, Akito Nakadomari, Ying-Yi Hong, Paras Mandal, Hiroshi Takahashi, and Tomonobu Senjyu. 2020. "Optimization of Voltage Unbalance Compensation by Smart Inverter" Energies 13, no. 18: 4623. https://doi.org/10.3390/en13184623

APA Style

Shigenobu, R., Nakadomari, A., Hong, Y.-Y., Mandal, P., Takahashi, H., & Senjyu, T. (2020). Optimization of Voltage Unbalance Compensation by Smart Inverter. Energies, 13(18), 4623. https://doi.org/10.3390/en13184623

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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