EPE Association: EPE 2023 - DS1q: HVDC, FACTS, Solid State Transformers and Hybrid Circuit Breakers

EPE 2023 - DS1q: HVDC, FACTS, Solid State Transformers and Hybrid Circuit Breakers
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1q: HVDC, FACTS, Solid State Transformers and Hybrid Circuit Breakers

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   Comprehensive Study on the Grid Fault Behavior of Grid-Forming Control for Modular Multilevel Converters
By Andres Sebastian PAEZ DELGADO, Christian NEUMANN, Hans-Günter ECKEL [View]
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Abstract: This comparative study evaluates the performance of various Grid-Forming techniques, namely, Virtual Synchronous Machine (VSM), Droop Control, and Proportional-Integral (PI) control. Additionally, it explores the structures used for fault current limitation, including the Voltage-Current cascade structure, the Synchronous Power Controller (SPC), and the Virtual Impedance. The study focuses on evaluating the performance of these Grid-Forming topologies and structures in terms of fault current limitation under various operating conditions and fault scenarios. Simulation-based investigations are conducted using a Modular Multilevel Converter (MMC) and a representative power system. A simple and effective control strategy based on a virtual impedance is also proposed to limit the fault current.

   Design of Bypass Switches for HV/MVHybrid Transformer Auxiliary Converters
By Adrian WIEMER, Jürgen BIELA [View]
[Download]

Abstract: The design of bypass switches is essential to protect the auxiliary converter connected to the HV/MV power transformer. In this paper critical fault cases are used to determine overcurrents in the HT auxiliary converter. The overcurrents are determined with a power transformer model that includes a core saturation model and parasitic capacitances between the transformer wind- ings. Based on the determined overcurrent levels two bypass switches are designed to protect the HT auxiliary converter against critical faults.

   Positioning and Control of Power-Flow Controllers in Meshed MVDC Grids
By Sreedhar KAMMANA, Christopher DAHMEN, Thomas BRÜCKNER [View]
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Abstract: This paper deals with Power-Flow Controllers (PFC) utilized in meshed MVDC grids to ensure full dynamic controllability of the grid. A control structure is proposed that combines line current regulation and adaptation of the PFC capacitor voltage, aiming to reduce the converter switching losses. Additionally, the positioning of PFC within a meshed grid is investigated to achieve maximum controllability and fault-handling capability while minimizing PFC voltage requirements.

   Protection of Multi-Terminal VSC HVDC Hybrid Transmission Line
By Jalal SAHEBKAR FARKHANI, Özgür ÇELIK, Kaiqi MA, Zhe CHEN, Claus LETH BAK [View]
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Abstract: This paper presents a fast fault detection schemefor a hybrid line in a multi-terminal (MT) voltagesource converter (VSC) high voltage DC(HVDC) system. The proposed method is basedon the primary and secondary protection scheme.The discrete wavelet transforms (DWT) withTeager energy operator (TEO) and voltagepolarity comparison are applied to detect thefaulted line for primary and secondary protectionschemes, respectively. The main and backupprotection schemes are based on non-pilot andpilot methods, respectively. The proposed mainand backup methods are robust against highimpedance faults (HIFs). The proposed protectionscheme is verified under different fault pointsapplied on an MT-HVDC test system. The casestudy is performed using PSCAD/EMTDCsoftware. Simulation results show theeffectiveness of the proposed protection methodfor the VSC HVDC transmission line.

EPE 2023 - DS1q: HVDC, FACTS, Solid State Transformers and Hybrid Circuit Breakers
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2023 ECCE Europe - Conference > EPE 2023 - Topic 07: Power Supplies > EPE 2023 - DS1q: HVDC, FACTS, Solid State Transformers and Hybrid Circuit Breakers
	[return to parent folder]

	Comprehensive Study on the Grid Fault Behavior of Grid-Forming Control for Modular Multilevel Converters By Andres Sebastian PAEZ DELGADO, Christian NEUMANN, Hans-Günter ECKEL	[View] [Download]
Abstract: This comparative study evaluates the performance of various Grid-Forming techniques, namely, Virtual Synchronous Machine (VSM), Droop Control, and Proportional-Integral (PI) control. Additionally, it explores the structures used for fault current limitation, including the Voltage-Current cascade structure, the Synchronous Power Controller (SPC), and the Virtual Impedance. The study focuses on evaluating the performance of these Grid-Forming topologies and structures in terms of fault current limitation under various operating conditions and fault scenarios. Simulation-based investigations are conducted using a Modular Multilevel Converter (MMC) and a representative power system. A simple and effective control strategy based on a virtual impedance is also proposed to limit the fault current.

	Design of Bypass Switches for HV/MVHybrid Transformer Auxiliary Converters By Adrian WIEMER, Jürgen BIELA	[View] [Download]
Abstract: The design of bypass switches is essential to protect the auxiliary converter connected to the HV/MV power transformer. In this paper critical fault cases are used to determine overcurrents in the HT auxiliary converter. The overcurrents are determined with a power transformer model that includes a core saturation model and parasitic capacitances between the transformer wind- ings. Based on the determined overcurrent levels two bypass switches are designed to protect the HT auxiliary converter against critical faults.

	Positioning and Control of Power-Flow Controllers in Meshed MVDC Grids By Sreedhar KAMMANA, Christopher DAHMEN, Thomas BRÜCKNER	[View] [Download]
Abstract: This paper deals with Power-Flow Controllers (PFC) utilized in meshed MVDC grids to ensure full dynamic controllability of the grid. A control structure is proposed that combines line current regulation and adaptation of the PFC capacitor voltage, aiming to reduce the converter switching losses. Additionally, the positioning of PFC within a meshed grid is investigated to achieve maximum controllability and fault-handling capability while minimizing PFC voltage requirements.

	Protection of Multi-Terminal VSC HVDC Hybrid Transmission Line By Jalal SAHEBKAR FARKHANI, Özgür ÇELIK, Kaiqi MA, Zhe CHEN, Claus LETH BAK	[View] [Download]
Abstract: This paper presents a fast fault detection schemefor a hybrid line in a multi-terminal (MT) voltagesource converter (VSC) high voltage DC(HVDC) system. The proposed method is basedon the primary and secondary protection scheme.The discrete wavelet transforms (DWT) withTeager energy operator (TEO) and voltagepolarity comparison are applied to detect thefaulted line for primary and secondary protectionschemes, respectively. The main and backupprotection schemes are based on non-pilot andpilot methods, respectively. The proposed mainand backup methods are robust against highimpedance faults (HIFs). The proposed protectionscheme is verified under different fault pointsapplied on an MT-HVDC test system. The casestudy is performed using PSCAD/EMTDCsoftware. Simulation results show theeffectiveness of the proposed protection methodfor the VSC HVDC transmission line.