EPE Association: EPE 2021 - Grid Connected Converters

EPE 2021 - Grid Connected Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 02: Power Converter Topologies and Design > EPE 2021 - Grid Connected Converters

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   A New Three-Phase Diode Rectifier with Improved Characteristics.
By Yasuyuki NISHIDA [View]
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Abstract: A new topology of the capacitor-input-type three-phase diode rectifier which satisfies the harmonicregulation of 'IEC 61000-3-2, Class A' under the condition with output power of 11 [kW] has beenproposed. The performance and characteristics of the new rectifier, the single three-phase-bridgerectifier and the double three-phase-bridge rectifier, all capacitor-input-type, are compared usingsimulation. Additionally, setups of the new and the single three-phase-bridge capacitor-input-typethree-phase rectifier are built and tested. Comparing the performance and characteristics obtained from the simulation and experiments, it has been shown that the new KOBE rectifier is advantageous than the single and double three-phase-bridge capacitor-input-type three-phase rectifier.

   A Novel Five-Level Transformer-less Inverter Topology with Common-Ground for Grid-Tied PV Applications
By Jaber FALLAH ARDASHIR [View]
[Download]

Abstract: This paper proposes a new common ground transformer-less step-up 5-Level inverter using a single dc voltage source without leakage current for grid-connected PV applications. The proposed inverter is based on the flying capacitor concept which uses seven switches, three dc capacitors and a single dc source to generate a 5-level discrete output voltage. The main merits of the proposed single-stagetopology include common-ground type, reactive power support, boosting capability and a fewer number of components compared with recently introduced five-level topologies. The proposed inverter has double voltage boosting gain without utilizing any step-up dc/dc converter which makes it a promising structure for grid-tied PV applications. The superiority of the proposed inverter is compared with similar existing five-level topologies in order to highlight its advantages. Moreover, a 1-kVA experimental prototype is implemented to show the proficiency of proposed inverter.

   Multilevel Hysteresis Control with Current Balancing of paralleled Two-level Converters
By Yves HEIN [View]
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Abstract: This paper presents a novel control concept for paralleled two-level converters. The parallel convertersare switched in a coordinated manner. Thus, the overall system is operating like one multilevel converter,which results in a low Total Harmonic Distortion of the grid current. Furthermore, a balancing methodfor the individual converter currents is introduced.

   Optimization-based reference calculation for Modular Multilevel Converters in balanced and unbalanced network conditions
By Daniel WESTERMAN SPIER [View]
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Abstract: The paper addresses an optimization-based algorithm to calculate the references of the Modular Multilevel Converter (MMC) during normal and constrained scenarios (when the prioritization of quantities is required). The optimization problem prioritizes to satisfy the positive- and negative-sequence active and reactive current set-points demanded by the Transmission System Operator (TSO) through the corresponding grid code. If the TSO's requirements are achieved, the algorithm minimizes the arm impedances losses. Otherwise, it attempts to reduce the error between the current components and the TSO's current set-points. The optimization-based current reference calculation is derived based on the steady-state equations of the MMC, considering the maximum currents that can flow through the MMC's arms, the maximum and minimum arm applied voltages and the maximum sub-module capacitor's voltage. Simulation in the time-domain have been conducted and the results indicate that this method can be potentially employed to calculate the converter's references during both normal and faulted conditions.

EPE 2021 - Grid Connected Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2021 ECCE Europe - Conference > EPE 2021 - Topic 02: Power Converter Topologies and Design > EPE 2021 - Grid Connected Converters
	[return to parent folder]

	A New Three-Phase Diode Rectifier with Improved Characteristics. By Yasuyuki NISHIDA	[View] [Download]
Abstract: A new topology of the capacitor-input-type three-phase diode rectifier which satisfies the harmonicregulation of 'IEC 61000-3-2, Class A' under the condition with output power of 11 [kW] has beenproposed. The performance and characteristics of the new rectifier, the single three-phase-bridgerectifier and the double three-phase-bridge rectifier, all capacitor-input-type, are compared usingsimulation. Additionally, setups of the new and the single three-phase-bridge capacitor-input-typethree-phase rectifier are built and tested. Comparing the performance and characteristics obtained from the simulation and experiments, it has been shown that the new KOBE rectifier is advantageous than the single and double three-phase-bridge capacitor-input-type three-phase rectifier.

	A Novel Five-Level Transformer-less Inverter Topology with Common-Ground for Grid-Tied PV Applications By Jaber FALLAH ARDASHIR	[View] [Download]
Abstract: This paper proposes a new common ground transformer-less step-up 5-Level inverter using a single dc voltage source without leakage current for grid-connected PV applications. The proposed inverter is based on the flying capacitor concept which uses seven switches, three dc capacitors and a single dc source to generate a 5-level discrete output voltage. The main merits of the proposed single-stagetopology include common-ground type, reactive power support, boosting capability and a fewer number of components compared with recently introduced five-level topologies. The proposed inverter has double voltage boosting gain without utilizing any step-up dc/dc converter which makes it a promising structure for grid-tied PV applications. The superiority of the proposed inverter is compared with similar existing five-level topologies in order to highlight its advantages. Moreover, a 1-kVA experimental prototype is implemented to show the proficiency of proposed inverter.

	Multilevel Hysteresis Control with Current Balancing of paralleled Two-level Converters By Yves HEIN	[View] [Download]
Abstract: This paper presents a novel control concept for paralleled two-level converters. The parallel convertersare switched in a coordinated manner. Thus, the overall system is operating like one multilevel converter,which results in a low Total Harmonic Distortion of the grid current. Furthermore, a balancing methodfor the individual converter currents is introduced.

	Optimization-based reference calculation for Modular Multilevel Converters in balanced and unbalanced network conditions By Daniel WESTERMAN SPIER	[View] [Download]
Abstract: The paper addresses an optimization-based algorithm to calculate the references of the Modular Multilevel Converter (MMC) during normal and constrained scenarios (when the prioritization of quantities is required). The optimization problem prioritizes to satisfy the positive- and negative-sequence active and reactive current set-points demanded by the Transmission System Operator (TSO) through the corresponding grid code. If the TSO's requirements are achieved, the algorithm minimizes the arm impedances losses. Otherwise, it attempts to reduce the error between the current components and the TSO's current set-points. The optimization-based current reference calculation is derived based on the steady-state equations of the MMC, considering the maximum currents that can flow through the MMC's arms, the maximum and minimum arm applied voltages and the maximum sub-module capacitor's voltage. Simulation in the time-domain have been conducted and the results indicate that this method can be potentially employed to calculate the converter's references during both normal and faulted conditions.