Methodology for the analysis of voltage unbalance in networks with single‐phase distributed generation

Abstract

This paper presents a sequence networks based methodology for investigating voltage unbalance in distribution networks with renewable generation. The sequence networks are derived from the original asymmetrical three-phase network, and then interconnected to study sequence voltages and unbalance propagation through the network. The approach enables to analyse the influence of line impedance, load demand and network topology on voltage unbalance caused by distributed generation in the network. The critical factors which impact the unbalance severity and the propagation mode are also identified. The approach is validated by comparing calculated sequence voltages with the results obtained by phase voltage based methodology.

Non‐contact voltage measurement of three‐phase overhead transmission line based on electric field inverse calculation

“…The three-phase imbalance occurs in the electric power system owing to the asymmetry of the three-phase components, line parameters, and load, which exerts a detrimental influence on the safety and stability of the power system [22,23]. Thus, the voltage measurement of transmission lines in a three-phase unbalanced state is crucial.…”

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

“…The alarming concern for eco‐friendly architecture and European Union's (EU) deadline to reduce carbon emission to 80% to 90% by 2050 and at least 27% use of renewable sources by 2030 result in the evolution of smart power utilization option, like microgrid . Microgrids are the solutions to incorporate several types of distributed Renewable Energy Sources (RESs), energy storage devices, Electric Vehicle (EV) charging stations, and different types of dynamic and nonlinear load, with the utility grid . The design and deployment of the conventional approach of a microgrid are usually done with the help of the Alternating Current (AC) system .…”

“…1 Microgrids are the solutions to incorporate several types of distributed Renewable Energy Sources (RESs), energy storage devices, Electric Vehicle (EV) charging stations, and different types of dynamic and nonlinear load, with the utility grid. 2 The design and deployment of the conventional approach of a microgrid are usually done with the help of the Alternating Current (AC) system. 3 The Direct Current (DC) microgrids are gaining attraction in real-time implementation due to various advantages over AC microgrid like lack of need for synchronization, high power transfer capability, frequency regulation, and support with less interfacing power electronics equipment of DC loads and Distributed Energy Resources (DERs).…”

Data‐driven partition control strategy for harmonic distortion and voltage unbalance

“…The operation of DG and power electronic loads inevitably causes the injection of harmonic currents into networks, which increases the complexity of harmonic distribution [3,4]. Meanwhile, the single-phase connections of massive DG and loads result in uneven loads among phases, which aggravate voltage unbalance in distribution networks [5]. The emission of each disturbance source may satisfy standard requirements but may result in serious harmonic distortion and voltage unbalance in the entire network due to the superposition effect of emissions from highly penetrative and decentralised disturbance sources.…”