EPE Association: EPE 2014 - LS6f: Fault Coordination and Protection of DC Grids

EPE 2014 - LS6f: Fault Coordination and Protection of DC Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 06: Grids and Smart Grids > EPE 2014 - LS6f: Fault Coordination and Protection of DC Grids

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   Feedback Linearization Control of Series Active DC Filters for MVDC Shipboard Power Systems
By Yoon-Cheul JEUNG, DONG-CHOON LEE, Hong-Hee LEE [View]
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Abstract: In this paper, a nonlinear control of active DC filters (ADF) is proposed to compensate for theharmonic ripple voltage in a medium-voltage DC shipboard power system. A nonlinear model of theADF is linearized by feedback linearization theory. Simulation results shows that the proposed methodcan suppress the fluctuation in the DC-bus voltage effectively.

   Harmonic Distortions of Multiple Power Factor Compensated EV Chargers
By Lauri KUTT, Eero SAARIJARVI, Matti LEHTONEN, Heigo MOLDER, Jaan NIITSOO [View]
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Abstract: Electric vehicle chargers are mostly power converters with power factor correction and waveform shaping features included. Different vehicle makes and models will likely have different charger control and topology. While the charger charging currents have generally low AC waveform distortions, including variety of chargers at the same time can provide even further lower harmonic currents. This is due to harmonic cancellation brought by different harmonic patterns of different chargers. The present paper analyzes the sine distortions and the sum of the harmonic currents of multiple harmonic sources of such type. The inputs for the analysis are the measurements of the commercial EVs harmonic charging current patterns. It will be shown that remarkable harmonic cancellation will be likely if different vehicle types are included in the pool of vehicles charging at the same time. The results presented here for the EV chargers would be valid also for other similar mains interface converters.

   Power Electronic Losses of a Customer-end Inverter in Low-Voltage Direct Current Distribution
By Pasi NUUTINEN, Aleksi MATTSSON, Tero KAIPIA, Pasi PELTONIEMI, Antti PINOMAA, Andrey LANA, Janne KARPPANEN, Pertti SILVENTOINEN [View]
[Download]

Abstract: A low-voltage direct current (LVDC) distribution system comprises a rectifier, a DC network, and customer-end inverters (CEI) responsible for the AC supply to the electricity end-users. The CEIs can be implemented as single-phase or three-phase ones; in this paper, feasible single- and three-phase topologies are introduced and their losses are calculated using nine different power switches. Three commercially available IGBT, MOSFET, and SiC MOSFET power switches are selected for comparison. In this application, a galvanic isolation between the DC network and the customer is required. The isolation is implemented by using an isolating DC/DC converter at the CEI supply, and therefore, the input voltage of the CEI can be different from the DC network voltage. In this paper, the effect of the supply voltage level on the losses of the CEI is calculated for the nine power transistors in single- and three-phase topologies.

   Steady-State DC Fault Analysis of Multiport DC hub
By Jianxi ZHANG, Dragan JOVICIC, Weixing LIN [View]
[Download]

Abstract: This paper presents the steady state dc fault analysis of a recently proposed LCL dc hub for use in dc grid. Analytical mathematical equations for fault currents are derived. The analytical study is confirmed by detailed simulation on PSCAD/ETMDC. Results show that the LCL dc hub can inherently limit fault current to close to rated values on all ports.

EPE 2014 - LS6f: Fault Coordination and Protection of DC Grids
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 06: Grids and Smart Grids > EPE 2014 - LS6f: Fault Coordination and Protection of DC Grids
	[return to parent folder]

	Feedback Linearization Control of Series Active DC Filters for MVDC Shipboard Power Systems By Yoon-Cheul JEUNG, DONG-CHOON LEE, Hong-Hee LEE	[View] [Download]
Abstract: In this paper, a nonlinear control of active DC filters (ADF) is proposed to compensate for theharmonic ripple voltage in a medium-voltage DC shipboard power system. A nonlinear model of theADF is linearized by feedback linearization theory. Simulation results shows that the proposed methodcan suppress the fluctuation in the DC-bus voltage effectively.

	Harmonic Distortions of Multiple Power Factor Compensated EV Chargers By Lauri KUTT, Eero SAARIJARVI, Matti LEHTONEN, Heigo MOLDER, Jaan NIITSOO	[View] [Download]
Abstract: Electric vehicle chargers are mostly power converters with power factor correction and waveform shaping features included. Different vehicle makes and models will likely have different charger control and topology. While the charger charging currents have generally low AC waveform distortions, including variety of chargers at the same time can provide even further lower harmonic currents. This is due to harmonic cancellation brought by different harmonic patterns of different chargers. The present paper analyzes the sine distortions and the sum of the harmonic currents of multiple harmonic sources of such type. The inputs for the analysis are the measurements of the commercial EVs harmonic charging current patterns. It will be shown that remarkable harmonic cancellation will be likely if different vehicle types are included in the pool of vehicles charging at the same time. The results presented here for the EV chargers would be valid also for other similar mains interface converters.

	Power Electronic Losses of a Customer-end Inverter in Low-Voltage Direct Current Distribution By Pasi NUUTINEN, Aleksi MATTSSON, Tero KAIPIA, Pasi PELTONIEMI, Antti PINOMAA, Andrey LANA, Janne KARPPANEN, Pertti SILVENTOINEN	[View] [Download]
Abstract: A low-voltage direct current (LVDC) distribution system comprises a rectifier, a DC network, and customer-end inverters (CEI) responsible for the AC supply to the electricity end-users. The CEIs can be implemented as single-phase or three-phase ones; in this paper, feasible single- and three-phase topologies are introduced and their losses are calculated using nine different power switches. Three commercially available IGBT, MOSFET, and SiC MOSFET power switches are selected for comparison. In this application, a galvanic isolation between the DC network and the customer is required. The isolation is implemented by using an isolating DC/DC converter at the CEI supply, and therefore, the input voltage of the CEI can be different from the DC network voltage. In this paper, the effect of the supply voltage level on the losses of the CEI is calculated for the nine power transistors in single- and three-phase topologies.

	Steady-State DC Fault Analysis of Multiport DC hub By Jianxi ZHANG, Dragan JOVICIC, Weixing LIN	[View] [Download]
Abstract: This paper presents the steady state dc fault analysis of a recently proposed LCL dc hub for use in dc grid. Analytical mathematical equations for fault currents are derived. The analytical study is confirmed by detailed simulation on PSCAD/ETMDC. Results show that the LCL dc hub can inherently limit fault current to close to rated values on all ports.