A5029421033- Power Quality and Harmonics
- Advanced Electrical Measurement Techniques
- Magnetic Properties and Applications
- Electromagnetic Compatibility and Noise Suppression
- Power Line Communications and Noise
- Lightning and Electromagnetic Phenomena
- Non-Destructive Testing Techniques
- Sensor Technology and Measurement Systems
- Advanced DC-DC Converters
- Power System Optimization and Stability
- Ocular and Laser Science Research
- Electrical Fault Detection and Protection
- Electrostatic Discharge in Electronics
- Power Transformer Diagnostics and Insulation
- Power Systems Fault Detection
- Analog and Mixed-Signal Circuit Design
- Engine and Fuel Emissions
- Impact of Light on Environment and Health
- Corporate Governance and Management
- Laser Design and Applications
- Wireless Sensor Networks for Data Analysis
- Electromagnetic Compatibility and Measurements
- Power Systems and Technologies
- Silicon Carbide Semiconductor Technologies
- Smart Grid Energy Management
TU Dresden
2015-2025
University of the Basque Country
2021
This paper presents the results of comprehensive testing and subsequent detailed analysis obtained test results, evaluating harmonic interharmonic performances photovoltaic inverters (PVInvs) for a range different operating conditions. The presented indicate significant power-dependent changes in emissions tested PVInvs supply voltage conditions (presence waveform distortions various source impedance values). To correctly quantify describe these PVInv performance, this discusses applies...
The number of compact fluorescent lamps (CFL) and based on Light Emitting Diodes (LED) increases continuously. Compared to the classical incandescent modern illumination equipment represents non-linear loads that may have impact Power Quality in low voltage grids. network disturbances can be divided two classes: continuous transient disturbances. paper presents results an analysis three disturbance phenomena, namely order harmonics, higher frequency emission switch-on currents. Measurement...
Harmonic levels and their propagation in the power system are mainly determined by network harmonic impedance. It is also an essential parameter for calculation of current emission limits. Different methods measuring impedance have been developed last decades, but all them assume that constant within a cycle at fundamental frequency, which true case passive elements only. As nowadays most equipment low voltage grids contains electronics including rectifier circuits, will vary half frequency....
The measurement of harmonic and interharmonic voltages up to 2.5 kHz is an inherent part the Power Quality assessment in electrical networks. In past monitoring has been minor importance for many transmission system operators (TSO). As number power electronics connected grid (e.g. self-commutating HVDC stations or converters large wind plants) increases continuously, concern TSOs regarding levels grows as well. This also confirmed by recent significant increase installed monitors grids....
Harmonic resonances in electricity networks can cause significant amplification of harmonic voltages/currents. They also affect the stable operation power electronics with internal software controls, like photovoltaic inverters (harmonic instabilities). Up to now capacitor banks are treated as main reason for residential low-voltage (LV) and long they detuned, no at frequencies <2 kHz expected. However, measurements an urban network without dedicated have indicated existence a resonance...
Instrument transformers (ITs) play a key role in electrical power systems, facilitating the accurate monitoring and measurement of quantities. They are essential for measurement, protection, metering transmission distribution grids accurately reducing grid voltage current low-voltage input instrumentation. With increase renewable energy sources, electronic converters, electric vehicles connected to grids, ITs now face challenging distorted conditions that differ from nominal ones. The study...
Supraharmonic emission in the frequency range 2 kHz to 150 is growing since more and electronic mass-market devices are equipped with energy efficient self-controlled switching topologies. Since audible up 20 covered by supraharmonic emission, it raises question if these producing considerable disturbing noises. This paper gives an overview of sound generation mechanism devices. The impact supraharmonics on noise household equipment studied a measurement survey 103
With an increasing number of power converters using fast switching technologies, more cases interference between devices in the frequency range from 2 to 150 kHz occur. The most widely used technique such is pulse‐width modulation (PWM) [e.g. photovoltaic inverters (PVIs), active harmonic filters, battery storage systems and some types electric vehicle chargers]. Only little known about behaviour those sources, factors influencing their emission interaction with other propagation network. To...
Conventional inductive voltage transformers (VT) are widely used in MV, HV and EHV networks to measure harmonic voltages. Accuracy of VTs at frequencies other than nominal frequency (50Hz/60Hz) not defined by standards, but may significant influence the overall accuracy measurements. Thus a reliable compliance verification compatibility levels, planning levels or emission limits (e.g. according IEC 61000-2-12, 61000-3-6) become difficult. Due lot influencing factors (like manufacturing...
This paper introduces a general implementation procedure for the measurement of harmonic phase angles using Power Quality (PQ) instruments. It is intended to fill this gap standards IEC 61000-4-7 and 61000-4-30, particular with focus on grid measurements. While single time instant well defined, focuses methods aggregate in frequency time. The application illustrated different simulated real data. Moreover, accuracy angle procedures test are provided.
Inductive voltage transformers are widely used in medium networks to measure harmonic voltages. The accuracy of these at frequencies other than nominal frequency (50Hz/60Hz) is not yet defined by standards, but can have a significant impact on the overall measurements. Consequently, accurate assessment levels, e.g. for verifying compliance with compatibility planning levels or emission limits, requires knowledge about frequency-dependent transfer characteristic transformers. This transformer...
The paper presents and evaluates three advanced methods for the characterization of low-voltage (LV) grid access impedance frequency range assigned to Narrow Band-Power Line Communications (NB-PLC): 9 kHz 500 kHz. This study responds recent demand from both regulatory bodies Distribution System Operators about need accurate validated this band, due limited knowledge values in electrical their influence on NB-PLC transmission channels. In paper, results a collaborative work develop different...
This paper analyses the impact of operating modes and nonideal power supply conditions on efficiency modern low-voltage electronic devices. The sophisticated circuits controls implemented in such devices are expected to result increased efficiencies, higher factors, reduced harmonic emissions. However, interactions individual PE with supplying network will exchanges powers at fundamental system frequency nonfundamental (i.e., harmonic) frequencies. correlates obtained results for performance...
Power quality (PQ) analysis requires to calculate a lot of different parameters (e.g. unbalance, THD, harmonic powers, impedances, ...) based on measured voltages and currents (fundamental harmonics). Respective standards data sheets measurement equipment define the accuracies only for these quantities. The resulting uncertainty derived from quantities are usually not available, but crucial wide variety applications, like assessment prevailing phasor or fundamental negative sequence...
The influence of measurement setup on the waveform distortion between 2-150 kHz (Supraharmonics) is analysed in this paper using a laboratory setup. Different LED lamps are used to observe how emissions at supraharmonic range affected when considering different power sources, network impedances and current sensors. A particular condition impedance modified amplitude emissions, whilst sensor included additional kHz. identification conditions where by step forward development reliable,...
The accuracy of power quality measurements relies on the use common measurement procedures and traceable systems, which necessarily include instrument transformers. paper provides an overview progress achieved within EU project 19NRM05 IT4PQ in developing needed metrological framework, terms performance indexes to qualify transformers for PQ measurements, simplified testing set-ups, quantification their behaviour under multiple influence factors.
Frequency-dependent network impedance (FdNI) is a crucial aspect of electromagnetic compatibility coordination. In low voltage (LV) networks, reference characteristics are commonly used to represent FdNI in the frequency range 2-150 kHz. These essential for credible regulatory regime, but they based on studies conducted several decades ago. This paper presents results comprehensive study that aims validate suitability impedances representing current public LV networks. The draws conclusions...
The standard flickermeter algorithm commonly used for the evaluation of flicker severity in current electromagnetic compatibility standards originates from 1980s. It was developed with an incandescent lamp as a reference light source and optimized to voltage fluctuations caused by arc furnaces. However, is questionable situation grid changed since 1980s; many modern devices are being connected grid, creating distortion patterns which not properly recognized flickermeter. Moreover, lamps have...
Power line Frequency and Time dependent Grid Impedance (FTdGI) influences the propagation of Line Communication (PLC) signals impacts communication with Smart Meters. The precise measurement power impedance is ill-defined only possible a limited number instruments. This paper presents results Z-NET project aiming to establish metrological traceable grid standard that enables objective comparison proposed measuring techniques. A Static Reference (SIR) was defined, built, characterized....
The measurement of harmonic and interharmonic voltages is essential for the assessment voltage quality in electrical networks. As number emitting loads higher levels increases, interest network operators accurate knowledge about also increases. In many cases, traditional inductive transformers (IVTs), which are only designed high accuracy at rated frequency, used to measure harmonics. This challenges measurements reliability a compliance assessment. Since direct, invasive IVT's frequency...
The measurement of harmonic and interharmonic voltages up to 2.5 kHz is an inherent part the Power Quality assessment in electrical networks. In past monitoring has been minor importance for many transmission system operators (TSO). As number power electronics connected grid (e.g. self-commutated HVDC stations or converters large wind plants) increases continuously, concern TSOs regarding levels grows as well. This also confirmed by recent significant increase installed monitors grids [1]....