EPE Association: EPE 2023 - LS5e: Converter Design and Optimisation

EPE 2023 - LS5e: Converter Design and Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 03: Measurement and Control > EPE 2023 - LS5e: Converter Design and Optimisation

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   Benefits of saturated powder core inductors in LCL filters of three-phase voltage source inverters
By Marius KAUFMANN-BÜHLER, Hayrettin ÖZELOGLU, Eric EICHSTÄDT, Sibylle DIECKERHOFF [View]
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Abstract: Magnetic powder cores introduce a varying inductance to LCL filters of voltage source inverters due to their saturation characteristics. This has a great impact on the inverter output current ripple. We propose a filter and inductor design method which considers the saturation effects. The advantages of saturating filter inductors in terms of the required inductance, inductor volume, core losses and winding resistance are derived analytically. Allowing inductor saturation during fundamental current amplitude results in a drastic volume and winding resistance decrease. Experiments verify the expected current ripple and winding resistances depending on the desired inductor saturation. The topic is discussed by means of a 10 kW three-phase voltage-source inverter.

   Frequency optimisation for DC/DC converters in DC-connected offshore wind turbines
By Victor TIMMERS, Agusti EGEA-ALVAREZ, Aris GKOUNTARAS [View]
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Abstract: In all-DC wind farms, DC/DC converters connect the low voltage wind turbine output to the high voltage DC array. One potential benefit of using DC/DC converters is that they require a relatively small transformer due to their higher frequency operation. However, there is no consensus as to what this frequency should be. This paper aims to determine the optimal operating frequency for DC/DC converters in 15 MW wind turbines connected to an 80 kV DC array. A multi-objective optimisation is performed taking into account the DC/DC converter volume, weight and losses. Frequencies ranging from 500 Hz to 5 kHz were tested for unidirectional, bidirectional, single-phase and three-phase converters. The optimal frequencies for unidirectional and bidirectional converters were found to be approximately 2 kHz and 1 kHz, respectively.

   Storage-less PV Grid Forming Inverter with Inertial reserve for the low inertia applications
By Zoran MILETIC, Andres TARRASO, Werner TREMMEL, Anja BANJAC, Johannes STOECKL [View]
[Download]

Abstract: To enable a grid friendly behavior of PV energy systems, grid-forming strategies are continuously evolving to provide enhanced performances to the grid connected converters. This paper presents a storage-less PV inverter with inertial reserve for the low inertia applications. Detailed control structure and results are presented and reasoned throughout the paper.

EPE 2023 - LS5e: Converter Design and Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 03: Measurement and Control > EPE 2023 - LS5e: Converter Design and Optimisation
	[return to parent folder]

	Benefits of saturated powder core inductors in LCL filters of three-phase voltage source inverters By Marius KAUFMANN-BÜHLER, Hayrettin ÖZELOGLU, Eric EICHSTÄDT, Sibylle DIECKERHOFF	[View] [Download]
Abstract: Magnetic powder cores introduce a varying inductance to LCL filters of voltage source inverters due to their saturation characteristics. This has a great impact on the inverter output current ripple. We propose a filter and inductor design method which considers the saturation effects. The advantages of saturating filter inductors in terms of the required inductance, inductor volume, core losses and winding resistance are derived analytically. Allowing inductor saturation during fundamental current amplitude results in a drastic volume and winding resistance decrease. Experiments verify the expected current ripple and winding resistances depending on the desired inductor saturation. The topic is discussed by means of a 10 kW three-phase voltage-source inverter.

	Frequency optimisation for DC/DC converters in DC-connected offshore wind turbines By Victor TIMMERS, Agusti EGEA-ALVAREZ, Aris GKOUNTARAS	[View] [Download]
Abstract: In all-DC wind farms, DC/DC converters connect the low voltage wind turbine output to the high voltage DC array. One potential benefit of using DC/DC converters is that they require a relatively small transformer due to their higher frequency operation. However, there is no consensus as to what this frequency should be. This paper aims to determine the optimal operating frequency for DC/DC converters in 15 MW wind turbines connected to an 80 kV DC array. A multi-objective optimisation is performed taking into account the DC/DC converter volume, weight and losses. Frequencies ranging from 500 Hz to 5 kHz were tested for unidirectional, bidirectional, single-phase and three-phase converters. The optimal frequencies for unidirectional and bidirectional converters were found to be approximately 2 kHz and 1 kHz, respectively.

	Storage-less PV Grid Forming Inverter with Inertial reserve for the low inertia applications By Zoran MILETIC, Andres TARRASO, Werner TREMMEL, Anja BANJAC, Johannes STOECKL	[View] [Download]
Abstract: To enable a grid friendly behavior of PV energy systems, grid-forming strategies are continuously evolving to provide enhanced performances to the grid connected converters. This paper presents a storage-less PV inverter with inertial reserve for the low inertia applications. Detailed control structure and results are presented and reasoned throughout the paper.