Power quality issues into a Danish low-voltage grid with electric vehicles

In this paper unified power quality conditioner has been used to enhance low voltage ride through capability of grid connected wind conversion system taking Doubly fed induction generator (DFIG). Unified Power quality conditioner (UPQC) device is a combination of series active filter and shunt active filter. This custom power device is mainly used to mitigate power quality issues which is an essential factor today because of wide application of power electronics devices. UPQC is capable to deal with voltage and current imperfection simultaneously. It is installed in the system mainly to improve the power quality i.e. Voltage sag/swell, Harmonics, reactive power compensation etc. at point of common coupling. System is modeled in MATLAB/SIMULINK and results shows utilization of UPQC for the enhancement of LVRT of a DFIG wind system according to Grid code. when fault occurs in the system, it will create voltage dip and series compensator of UPQC injects during this time to prevent disconnection from grid and stay connected to contribute during fault. UPQC is also used for fast restoration of system steady state, power factor improvement, prevent rotor over current.

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Electric vehicles and power quality in low voltage networks: Real data analysis and modeling

Applied Energy ◽

10.1016/j.apenergy.2021.117718 ◽

2022 ◽

Vol 305 ◽

pp. 117718

Author(s):

S. Torres ◽

I. Durán ◽

A. Marulanda ◽

A. Pavas ◽

J. Quirós-Tortós

Keyword(s):

Data Analysis ◽

Power Quality ◽

Electric Vehicles ◽

Low Voltage ◽

Real Data ◽

Real Data Analysis

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Distributed Energy Storage with Real and Reactive Power Controller for Power Quality Issues Caused by Renewable Energy and Electric Vehicles

Journal of Energy Engineering ◽

10.1061/(asce)ey.1943-7897.0000334 ◽

2016 ◽

Vol 142 (4) ◽

pp. 04015051 ◽

Cited By ~ 1

Author(s):

Khim Yan Lim ◽

Yun Seng Lim ◽

Jianhui Wong ◽

Kein Huat Chua

Keyword(s):

Renewable Energy ◽

Energy Storage ◽

Power Quality ◽

Electric Vehicles ◽

Reactive Power ◽

Distributed Energy ◽

Power Controller ◽

Distributed Energy Storage ◽

Quality Issues

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Review on Electric Traction Systems Driving Induction Motor and Associated Power Quality Issues

SMART MOVES JOURNAL IJOSCIENCE ◽

10.24113/ijoscience.v6i3.278 ◽

2020 ◽

Vol 6 (3) ◽

pp. 23-26

Author(s):

Servesh Bharati ◽

Mrs. Madhu Upadhyay

Keyword(s):

Power Quality ◽

Electric Vehicles ◽

Power Dissipation ◽

Power Converters ◽

Induction Motors ◽

Good Alternative ◽

Power Semiconductor ◽

Electric Induction ◽

Quality Issues ◽

Electric Traction

The traction systems for electric vehicles have advanced considerably over recent years, with the application of different topologies of power converters for the control of various types of electric induction motors and permanent magnet. Furthermore, the evolution of power semiconductor elements of Si to SiC wideband have opened up lines of research and development in this area. The trend of manufacturer’s traction systems is to reach compact systems where the power dissipation is high and the reduction of losses is minimal, for it the implementation of topologies of converters with SiC devices seems to be a good alternative of use to improve the performance of these systems. This paper studies the basic topologies of back to back converter in traction systems als well as the powr quality issues arriving in these systems.

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Experimental Verification of Self-Adapting Data-Driven Controllers in Active Distribution Grids

Energies ◽

10.3390/en14102837 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2837

Author(s):

Stavros Karagiannopoulos ◽

Athanasios Vasilakis ◽

Panos Kotsampopoulos ◽

Nikos Hatziargyriou ◽

Petros Aristidou ◽

...

Keyword(s):

Power Quality ◽

Experimental Verification ◽

Low Voltage ◽

Optimization Techniques ◽

Operating Conditions ◽

Training Data ◽

Data Driven ◽

Local Power ◽

Quality Issues ◽

Optimal Behaviour

Lately, data-driven algorithms have been proposed to design local controls for Distributed Generators (DGs) that can emulate the optimal behaviour without any need for communication or centralised control. The design is based on historical data, advanced off-line optimization techniques and machine learning methods, and has shown great potential when the operating conditions are similar to the training data. However, safety issues arise when the real-time conditions start to drift away from the training set, leading to the need for online self-adapting algorithms and experimental verification of data-driven controllers. In this paper, we propose an online self-adapting algorithm that adjusts the DG controls to tackle local power quality issues. Furthermore, we provide experimental verification of the data-driven controllers through power Hardware-in-the-Loop experiments using an industrial inverter. The results presented for a low-voltage distribution network show that data-driven schemes can emulate the optimal behaviour and the online modification scheme can mitigate local power quality issues.

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Integration of Large-Scale Electric Vehicles into Utility Grid: An Efficient Approach for Impact Analysis and Power Quality Assessment

Sustainability ◽

10.3390/su131910943 ◽

2021 ◽

Vol 13 (19) ◽

pp. 10943

Author(s):

Md. Mosaraf Hossain Khan ◽

Amran Hossain ◽

Aasim Ullah ◽

Molla Shahadat Hossain Lipu ◽

S. M. Shahnewaz Siddiquee ◽

...

Keyword(s):

Power Quality ◽

Electric Vehicles ◽

Large Scale ◽

Impact Analysis ◽

Low Voltage ◽

Lookup Table ◽

Line Current ◽

Utility Grid ◽

Bus Voltage ◽

High Level

Electric vehicles (EVs) have received massive consideration in the automotive industries due to their improved performance, efficiency and capability to minimize global warming and carbon emission impacts. The utilization of EVs has several potential benefits, such as increased use of renewable energy, less dependency on fossil-fuel-based power generations and energy-storage capability. Although EVs can significantly mitigate global carbon emissions, it is challenging to maintain power balance during charging on-peak hours. Thus, it mandates a comprehensive impact analysis of high-level electric vehicle penetration in utility grids. This paper investigates the impacts of large-scale EV penetration on low voltage distribution, considering the charging time, charging method and characteristics. Several charging scenarios are considered for EVs’ integration into the utility grid regarding power demand, voltage profile, power quality and system adequacy. A lookup-table-based charging approach for EVs is proposed for impact analysis, while considering a large-scale integration. It is observed that the bus voltage and line current are affected during high-level charging and discharging of the EVs. The residential grid voltage sag increases by about 1.96% to 1.77%, 2.21%, 1.96 to 1.521% and 1.93% in four EV-charging profiles, respectively. The finding of this work can be adopted in designing optimal charging/discharging of EVs to minimize the impacts on bus voltage and line current.

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Potential Power Quality Benefits of Electric Vehicles

IEEE Transactions on Sustainable Energy ◽

10.1109/tste.2013.2263848 ◽

2013 ◽

Vol PP (99) ◽

pp. 1-8 ◽

Cited By ~ 38

Keyword(s):

Real Time ◽

Power Quality ◽

Electric Vehicles ◽

Single Phase ◽

Low Voltage ◽

Distribution Grid ◽

Vehicle To Grid ◽

Voltage Drops ◽

Cloudy Weather ◽

Real Time Digital Simulator

Electric vehicles (EVs) are likely to have a continued presence in the light-vehicle market in the next few decades. As a result, EV charging will put an extra burden on the distribution grid and adjustments need to be made in some cases. On the other hand, EVs have the potential to support the grid as well. This paper presents a single-phase bidirectional charger topology which pairs up a photovoltaic (PV) source with an EV charger resulting in production cost reduction. The presented topology is then used for vehicle-to-grid (V2G) services. The main focus of this paper is on power quality services which only slightly discharge the battery. Among these services, it studies the possibility of local reactive injection of EVs connected to the grid through a single-phase charger to compensate for voltage drops caused by motor startup or inductive loads. It also studies the possibility of active power injection of EVs for short time periods during PV transients in cloudy weather to keep the system stable. It also studies the potential of EVs to help during low voltage ride-through of the PV sources. The studies are performed using Simulink simulations and a real-time implementation in Real Time Digital Simulator (RTDS). The results demonstrate the effectiveness of power quality V2G services with small wear on the EV battery.

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Review On Electric Traction Systems Driving Induction Motor and Associated Power Quality Issues

IJOSTHE ◽

10.24113/ojssports.v7i1.120 ◽

2020 ◽

Vol 7 (1) ◽

pp. 4

Author(s):

Servesh Bharati ◽

Mrs. Madhu Upadhyay

Keyword(s):

Power Quality ◽

Electric Vehicles ◽

Power Dissipation ◽

Power Converters ◽

Induction Motors ◽

Good Alternative ◽

Power Semiconductor ◽

Electric Induction ◽

Quality Issues ◽

Electric Traction

The traction systems for electric vehicles have advanced considerably over recent years, with the application of different topologies of power converters for the control of various types of electric induction motors and permanent magnet. Furthermore, the evolution of power semiconductor elements of Si to SiC wideband have opened up lines of research and development in this area. The trend of manufacturer’s traction systems is to reach compact systems where the power dissipation is high and the reduction of losses is minimal, for it the implementation of topologies of converters with SiC devices seems to be a good alternative of use to improve the performance of these systems. This paper studies the basic topologies of back to back converter in traction systems als well as the powr quality issues arriving in these systems.

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Signatures of Transient Overvoltages in Low Voltage Power Systems in Tea Factories and Their Implications on Insulation Deterioration and Allied Power Quality Issues

Journal of Electrical and Computer Engineering ◽

10.1155/2021/2623965 ◽

2021 ◽

Vol 2021 ◽

pp. 1-12

Author(s):

Earl A. R. L. Pannila ◽

Mahesh Edirisinghe

Keyword(s):

Power Systems ◽

Power Quality ◽

Low Voltage ◽

Electrical Equipment ◽

High Rate ◽

Electrical Stress ◽

Transient Nature ◽

Electrical Resonance ◽

Quality Issues ◽

The Impact

Electrical equipment and supply cables demand a better quality of supply, with the recent advancements in integrated sensitive solid-state controls. Divergently, proliferated heavy inductive motors and some performance additions based on power electronics have introduced power quality issues to the network. Thus, this study mainly investigates the impact of switching transients generated by electromechanical machines in industrial power systems on insulation deterioration while taking transient overvoltages due to capacitor bank switching also to support. Transients with a high rate of rise are likely to catalyze the degradation of the insulation quality and break down the insulating material through ionization. These steeply passing overvoltage stresses let partial discharges ensue, which can attack the insulation over long service. To unveil this danger, 314 common-mode transient waveforms were measured in the electrical machines of five tea factories in Sri Lanka, in a 50 ms measurement window, taken in 55 measuring attempts. Most of the transients observed are in the form of a damped oscillatory waveform tailed by fast exponential collapse. That correlates to insulation degradation having a very steep rise as 30.04 V/ns, the highest at the withering section. When machines are heavily loaded, situations tend to generate transients with high amplitudes. There were transient bursts that spread as 426.3 ms, while 14 ns fast rise times were recorded from withering motors. Unlike electrical resonance and power-frequency overvoltages, electromagnetic switching transients last even less than 100 ms. To underline this, an analysis of the frequency domain of transients was also presented, which proves high density of high-frequency components reaching 107 kHz range. Accepting the fact that frequency and amplitude are always under the influences of innumerable dynamics, the observational evidence of the study endorses that electrical stress built by the transient nature of the factories reduces the life expectancy of electrical insulation.

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