Lauri Kütt
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View article: Effect of Bulk Capacitor on Harmonics of Energy-Efficient Devices
Effect of Bulk Capacitor on Harmonics of Energy-Efficient Devices Open
Funding Information: This work was supported in part by Estonian Research Council via Projects PRG2055, and in part by the Project \u2018\u2018Increasing the Knowledge Intensity of Ida-Viru Entrepreneurship\u2019\u2019 co-funded by Europea…
View article: A Review of Harmonic Detection, Suppression, Aggregation, and Estimation Techniques
A Review of Harmonic Detection, Suppression, Aggregation, and Estimation Techniques Open
The rapid growth of power electronics-based devices, such as electric vehicles and renewable energy systems, has introduced nonlinear components into power systems, generating high-frequency harmonics that distort current and voltage wavef…
View article: Inaccuracies and Uncertainties for Harmonic Estimation in Distribution Networks
Inaccuracies and Uncertainties for Harmonic Estimation in Distribution Networks Open
The proliferation of electronic loads has led to a substantial increase in harmonic emissions within low-voltage distribution networks. The accurate estimation of the expected levels of harmonics in a network is a daunting task for network…
View article: Inverter-Fed Motor Drive System: A Systematic Analysis of Condition Monitoring and Practical Diagnostic Techniques
Inverter-Fed Motor Drive System: A Systematic Analysis of Condition Monitoring and Practical Diagnostic Techniques Open
Due to their efficiency and control capabilities, induction motors fed with inverters have become prevalent in various industrial applications. However, ensuring the reliable operation of the motor and diagnosing faults on time are crucial…
View article: Waveform Variation Defined Model for Harmonic Current Emissions Including Cross-Order Supply Voltage Harmonics Influence
Waveform Variation Defined Model for Harmonic Current Emissions Including Cross-Order Supply Voltage Harmonics Influence Open
The paper reports an experimental non-linear load evaluation regarding current harmonics sensitivity to supply voltage harmonics. A base for the model is proposed relying on the time-domain waveform variations, rather than impedance or con…
View article: Congestion control strategies for increased renewable penetration of photovoltaic in LV distribution networks
Congestion control strategies for increased renewable penetration of photovoltaic in LV distribution networks Open
Domestic photovoltaic (PV) installations are increasing their spread due to decreased cost, environmental friendliness, and relatively easy installation. However, the massive domestic PV deployment can bring the LV network (LV) distributio…
View article: Feasibility Investigation for Residential Battery Sizing Considering EV Charging Demand
Feasibility Investigation for Residential Battery Sizing Considering EV Charging Demand Open
Photovoltaic (PV) systems along with battery energy storage systems (BESS) are an increasing trend for residential users due to the increasing cost of energy and environmental factors. Future sustainable grids will also have electric vehic…
View article: Current Harmonic Aggregation Cases for Contemporary Loads
Current Harmonic Aggregation Cases for Contemporary Loads Open
Power electronic circuits in modern power supplies have improved the conversion efficiency on the one hand but have also increased harmonic emissions. Harmonic currents from the operation of these units affect the voltage waveforms of the …
View article: Battery Size Optimization With Customer PV Installations and Domestic Load Profile
Battery Size Optimization With Customer PV Installations and Domestic Load Profile Open
Photovoltaic (PV) is a highly feasible solution for modern renewable energy-powered residential buildings in terms of deployment and cost reduction of utility bills. The installation of solar PV systems along with optimal battery energy st…
View article: Exploratory Data Analysis Based Short-Term Electrical Load Forecasting: A Comprehensive Analysis
Exploratory Data Analysis Based Short-Term Electrical Load Forecasting: A Comprehensive Analysis Open
Power system planning in numerous electric utilities merely relies on the conventional statistical methodologies, such as ARIMA for short-term electrical load forecasting, which is incapable of determining the non-linearities induced by th…
View article: Estimation of Harmonic Emission of Electric Vehicles and Their Impact on Low Voltage Residential Network
Estimation of Harmonic Emission of Electric Vehicles and Their Impact on Low Voltage Residential Network Open
The EV penetration in the low voltage residential grids is expected to increase rapidly in the coming years. It is expected that EV consumers will prefer overnight home charging because of its convenience and lack of charging infrastructur…
View article: Bivariate stochastic model of current harmonic analysis in the low voltage distribution grid
Bivariate stochastic model of current harmonic analysis in the low voltage distribution grid Open
This paper presents a bottom-up bivariate analysis approach to estimate current harmonics by taking account of network and load variations. The current harmonics assessment in the presence of existing and future nonlinear loads is vital to…
View article: Spectrum Analysis for Condition Monitoring and Fault Diagnosis of Ventilation Motor: A Case Study
Spectrum Analysis for Condition Monitoring and Fault Diagnosis of Ventilation Motor: A Case Study Open
In modern power systems, since most loads are inductive by nature, there is an ongoing power quality issue and researchers’ interest in improving the power factor is widespread, as inductive loads have a low power factor that depletes the …
View article: Electro-magnetic Sensors for Online Condition Monitoring of Medium Voltage Cables
Electro-magnetic Sensors for Online Condition Monitoring of Medium Voltage Cables Open
Increased use of medium voltage (MV) cables demands for efficient condition monitoring in order to carry out timely predictive maintenance especially during incipient fault conditions emerging due to insulation degradation. This paper pres…
View article: Travel Activity Based Stochastic Modelling of Load and Charging State of Electric Vehicles
Travel Activity Based Stochastic Modelling of Load and Charging State of Electric Vehicles Open
The uptake of electric vehicles (EV) is increasing every year and will eventually replace the traditional transport system in the near future. This imminent increase is urging stakeholders to plan up-gradation in the electric power system …
View article: An overview of measurement standards for power quality
An overview of measurement standards for power quality Open
Power Quality (PQ) is a vital aspect of electrical power systems, which cannot be neglected anymore, as an ample PQ guarantees the essential compatibility between consumer equipment and the electricity network. The analysis of electrical p…
View article: Performance Comparison of PD Data Acquisition Techniques for Condition Monitoring of Medium Voltage Cables
Performance Comparison of PD Data Acquisition Techniques for Condition Monitoring of Medium Voltage Cables Open
Already installed cables are aging and the cable network is growing rapidly. Improved condition monitoring methods are required for greater visibility of insulation defects in the cable networks. One of the critical challenges for continuo…
View article: Time Dependency of Current Harmonics for Switch-Mode Power Supplies
Time Dependency of Current Harmonics for Switch-Mode Power Supplies Open
This paper presents the time-dependent variance in the current harmonics emission by power supplies during power quality measurements. Power quality problems are becoming more significant with the adoption of power electronic-based circuit…
View article: Forecasting of Energy Consumption and Production Using Recurrent Neural Networks
Forecasting of Energy Consumption and Production Using Recurrent Neural Networks Open
Energy forecasting for both consumption and production is a challenging task as it involves many variable factors. It is necessary to calculate the actual production of energy and its consumption as it is very beneficial in maintaining dem…
View article: Performance Comparison of PD Data Acquisition Techniques for Condition Monitoring of Medium Voltage Cables
Performance Comparison of PD Data Acquisition Techniques for Condition Monitoring of Medium Voltage Cables Open
Already installed cables are aging and the cable network is growing rapidly. Improved condition monitoring methods are required for greater visibility of insulation defects in the cable networks. One of the critical challenges for continuo…
View article: Case study of non-linear PV inverter devices attached to the LV distribution network
Case study of non-linear PV inverter devices attached to the LV distribution network Open
Every year, more and more solar power plants are connected to the grid, producing electricity in an environmentally sustainable manner. The increasing number of photovoltaic (PV) installations and their integration into the low voltage (LV…
View article: Survey of a Power Quality Measurement Campaign in Low-Voltage Grids
Survey of a Power Quality Measurement Campaign in Low-Voltage Grids Open
With an increasing share of renewable energy generation becoming connected to distribution grids, power quality has attracted the attention of grid operators and academia. However, to obtain a realistic picture, power quality distortions c…
View article: Identification and Location of PD Defects in Medium voltage Underground Power Cables Using High Frequency Current Transformer
Identification and Location of PD Defects in Medium voltage Underground Power Cables Using High Frequency Current Transformer Open
Fault location is an important diagnostic task in condition monitoring of underground medium voltage cables. Available solutions are well capable of determining the location of a single partial discharge (PD) defect on a cable section. In …
View article: Conference program book EPE2018
Conference program book EPE2018 Open
The influence of the fuel thermal conductivity