EPE Association: EPE 2018 - LS1c: Grids: Power Quality issues

EPE 2018 - LS1c: Grids: Power Quality issues
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - LS1c: Grids: Power Quality issues

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   Investigation of Modeling for Conducted Noise Reduction on Isolated AC/DC Converter using SiC Devices
By Yuki KAWAMURA [View]
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Abstract: This paper describes the modeling method to simulate conducted noise on isolated AC/DC converter using SiC devices. The leakage current is measured to derive the equivalent circuit. Because the high frequency transformer has stray capacitance, the leakage current passing through the high frequency transformer is also measured. The equivalent circuit is derived by approximating the leakage current to RLC series circuit. In addition, simulation is performed by inserting the model of EMI _lter into the equivalent circuit. Furthermore, experiment is performed by inserting EMI _lter. By comparing the simulation and the measurement results, usefulness and validity of proposed the modeling method is con_rmed.

   Optimal Passive Filter Planning in Distribution Networks with Nonlinear Loads and photovoltaic systems
By Alireza SEDIGHI [View]
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Abstract: In this paper, the impact of grid-connected photovoltaic (PV) systems on voltage total harmonicdistortion (THDV) in radial distribution systems is investigated. To well present the behavior of PVsystems, both amplitude and phase angle of the harmonic current sources are considered in thesimulations. Specifically, when the current harmonic phase angle is considered, the photovoltaic andload harmonic may cancel out each other, which results in lower THDV values. It is also observed formthe simulation results that by increasing the PV penetration and nonlinear load demand, THDV mayincrease even beyond the allowed range. Therefore, an optimal passive harmonic filter (PHF) planningis also proposed for THDV mitigation and its effectiveness and applicability is tested and verified underdifferent working conditions. Optimal planning is performed considering a cost objective function whichincludes PHF cost and benefit of energy loss reduction. According to simulation result, an appropriatepassive harmonic filtering could guarantee an acceptable THDV in radial distribution and reduce energylosses.

   PSCAD Model of the Marine Sub-system with Nonlinear Load for Power Quality Assesment
By Andrzej PILAT [View]
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Abstract: The proposed paper deals with the problem of power quality (PQ) assessment in marine microgrids. Particularly, the problem of voltage and current waveform distortions is considered. The paper's main aim is experimental assessment of electromagnetic transient program (EMTP) PSCAD model of bow thruster sub-system onboard of example ship. The real sub-system model is developed, which consists of shaft generator, power converter and electric motor driving thruster propeller. Next, the voltage and current waveforms for three bow thruster loads are determined and the severity of harmonic distortions is calculated. Finally, the results of the distortion modeling are compared against the real measurement results. The research is to test the ability of example EMTP software to assessment of PQ in marine microgrids during the system design and integration, as required by provisions of Requirements Concerning Electrical and Electronic Installations by International Association of Classification Societies (IACS). This is to evaluate the system design, particularly to predict the risky configuration and operating conditions that could lead to a shipboard microgrid malfunction or failure.

   Voltage Spectrum in Shipboard Microgrid with the Varying Nonlinear Load
By Mariusz GORNIAK [View]
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Abstract: The paper presents the experimental results of harmonics measurements in example ship microgrid containing varying nonlinear load, namely high power adjustable speed drive of bow thruster. The research concentrates on voltage harmonics variations caused by the drive load changes from zero up to full load. The aim is to determine local minima (if present) of the respective harmonics for the future algorithms of power quality control. The idea of such an algorithm based on control of nonlinear loads is also presented.

EPE 2018 - LS1c: Grids: Power Quality issues
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 06: Grids, Smart Grids, AC & DC > EPE 2018 - LS1c: Grids: Power Quality issues
	[return to parent folder]

	Investigation of Modeling for Conducted Noise Reduction on Isolated AC/DC Converter using SiC Devices By Yuki KAWAMURA	[View] [Download]
Abstract: This paper describes the modeling method to simulate conducted noise on isolated AC/DC converter using SiC devices. The leakage current is measured to derive the equivalent circuit. Because the high frequency transformer has stray capacitance, the leakage current passing through the high frequency transformer is also measured. The equivalent circuit is derived by approximating the leakage current to RLC series circuit. In addition, simulation is performed by inserting the model of EMI _lter into the equivalent circuit. Furthermore, experiment is performed by inserting EMI _lter. By comparing the simulation and the measurement results, usefulness and validity of proposed the modeling method is con_rmed.

	Optimal Passive Filter Planning in Distribution Networks with Nonlinear Loads and photovoltaic systems By Alireza SEDIGHI	[View] [Download]
Abstract: In this paper, the impact of grid-connected photovoltaic (PV) systems on voltage total harmonicdistortion (THDV) in radial distribution systems is investigated. To well present the behavior of PVsystems, both amplitude and phase angle of the harmonic current sources are considered in thesimulations. Specifically, when the current harmonic phase angle is considered, the photovoltaic andload harmonic may cancel out each other, which results in lower THDV values. It is also observed formthe simulation results that by increasing the PV penetration and nonlinear load demand, THDV mayincrease even beyond the allowed range. Therefore, an optimal passive harmonic filter (PHF) planningis also proposed for THDV mitigation and its effectiveness and applicability is tested and verified underdifferent working conditions. Optimal planning is performed considering a cost objective function whichincludes PHF cost and benefit of energy loss reduction. According to simulation result, an appropriatepassive harmonic filtering could guarantee an acceptable THDV in radial distribution and reduce energylosses.

	PSCAD Model of the Marine Sub-system with Nonlinear Load for Power Quality Assesment By Andrzej PILAT	[View] [Download]
Abstract: The proposed paper deals with the problem of power quality (PQ) assessment in marine microgrids. Particularly, the problem of voltage and current waveform distortions is considered. The paper's main aim is experimental assessment of electromagnetic transient program (EMTP) PSCAD model of bow thruster sub-system onboard of example ship. The real sub-system model is developed, which consists of shaft generator, power converter and electric motor driving thruster propeller. Next, the voltage and current waveforms for three bow thruster loads are determined and the severity of harmonic distortions is calculated. Finally, the results of the distortion modeling are compared against the real measurement results. The research is to test the ability of example EMTP software to assessment of PQ in marine microgrids during the system design and integration, as required by provisions of Requirements Concerning Electrical and Electronic Installations by International Association of Classification Societies (IACS). This is to evaluate the system design, particularly to predict the risky configuration and operating conditions that could lead to a shipboard microgrid malfunction or failure.

	Voltage Spectrum in Shipboard Microgrid with the Varying Nonlinear Load By Mariusz GORNIAK	[View] [Download]
Abstract: The paper presents the experimental results of harmonics measurements in example ship microgrid containing varying nonlinear load, namely high power adjustable speed drive of bow thruster. The research concentrates on voltage harmonics variations caused by the drive load changes from zero up to full load. The aim is to determine local minima (if present) of the respective harmonics for the future algorithms of power quality control. The idea of such an algorithm based on control of nonlinear loads is also presented.