EPE Association: EPE 2015 - LS3e: Power Electronics in Distribution Systems

EPE 2015 - LS3e: Power Electronics in Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 06: Grids and Smart Grids > EPE 2015 - LS3e: Power Electronics in Distribution Systems

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   Evaluation of Topologies and Optimal Design of a Hybrid Distribution Transformer
By Johannes BURKARD [View]
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Abstract: Due to the increasing integration of distributed generators, the grid underlies conceptual challenges. To ensure an efficient and reliable operation, more controllable assets are expected in the future grid. The transformer as one of the most important components possesses only limited control capabilities today. By combining a conventional transformer with a converter, a hybrid transformer with comprehensive controllability is obtained. In this paper, suitable concepts are investigated and an optimum design is determined to compare its potential to conventional and solid state transformers.

   Extended Power Control for Distributed Generation Units
By René DIETZ [View]
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Abstract: This paper shows a general approach how to derive a decoupled power controller for inverter basedlow-voltage grids. The proposed method indicates a way to derive a decoupling matrix by analyzingthe general system equation, showing the inner structure of decoupling active and reactive power. Theresulting system brings independent actuation of frequency over active power and voltage over reactivepower.

   Prototype of Power Electronics Transformer for Smart Grid Application Prototype of Smart Energy Router for Distribution DC Grid
By Fanqiang GAO [View]
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Abstract: Smart energy router (SER), also called as power electronics transformer (PET) or solid state transformer (SST), will serve as a critical component in the next-generation electric power system. Taking advantage of modular multilevel converter (MMC) and input series output parallel (ISOP) topologies, new type of smart energy router has been developed. Presented architecture using two stages with AC/DC conversion in the medium-voltage (MV) side, and ISOP type DC/DC conversion in the low-voltage (LV) side, thus allows interaction with DC grid and local renewable sources, etc. Compared to existing topologies, proposed SER uses less power switches and high-frequency transformers. The details related to the 2-MVA SER prototype, including the electrical design of the circuits and control system is presented in this paper. Simulation and experimental results on this prototype with distribution DC grid show validity of this SER.

   Zero sequence voltage suppression control with capacitor voltage balancing for a multilevel modular matrix converter
By Yushi MIURA [View]
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Abstract: Zero sequence voltage suppression control for a multilevel modular matrix converter is investigated, which is required for applications to power systems and high power motor drives. The schemes of power flow control and capacitor voltage balancing control with voltage space vector modulation have been proposed. However, these control schemes have the problem they cause zero sequence current that affects protection for power systems and motors. To reduce the zero sequence current, the control scheme that suppresses zero sequence voltage by compensating voltage difference between input and output systems is proposed in this paper. Numerical simulation of a 9-level modular matrix converter and experiments using a 2-kW 5-level modular matrix converter are conducted to verify the control scheme.

EPE 2015 - LS3e: Power Electronics in Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 06: Grids and Smart Grids > EPE 2015 - LS3e: Power Electronics in Distribution Systems
	[return to parent folder]

	Evaluation of Topologies and Optimal Design of a Hybrid Distribution Transformer By Johannes BURKARD	[View] [Download]
Abstract: Due to the increasing integration of distributed generators, the grid underlies conceptual challenges. To ensure an efficient and reliable operation, more controllable assets are expected in the future grid. The transformer as one of the most important components possesses only limited control capabilities today. By combining a conventional transformer with a converter, a hybrid transformer with comprehensive controllability is obtained. In this paper, suitable concepts are investigated and an optimum design is determined to compare its potential to conventional and solid state transformers.

	Extended Power Control for Distributed Generation Units By René DIETZ	[View] [Download]
Abstract: This paper shows a general approach how to derive a decoupled power controller for inverter basedlow-voltage grids. The proposed method indicates a way to derive a decoupling matrix by analyzingthe general system equation, showing the inner structure of decoupling active and reactive power. Theresulting system brings independent actuation of frequency over active power and voltage over reactivepower.

	Prototype of Power Electronics Transformer for Smart Grid Application Prototype of Smart Energy Router for Distribution DC Grid By Fanqiang GAO	[View] [Download]
Abstract: Smart energy router (SER), also called as power electronics transformer (PET) or solid state transformer (SST), will serve as a critical component in the next-generation electric power system. Taking advantage of modular multilevel converter (MMC) and input series output parallel (ISOP) topologies, new type of smart energy router has been developed. Presented architecture using two stages with AC/DC conversion in the medium-voltage (MV) side, and ISOP type DC/DC conversion in the low-voltage (LV) side, thus allows interaction with DC grid and local renewable sources, etc. Compared to existing topologies, proposed SER uses less power switches and high-frequency transformers. The details related to the 2-MVA SER prototype, including the electrical design of the circuits and control system is presented in this paper. Simulation and experimental results on this prototype with distribution DC grid show validity of this SER.

	Zero sequence voltage suppression control with capacitor voltage balancing for a multilevel modular matrix converter By Yushi MIURA	[View] [Download]
Abstract: Zero sequence voltage suppression control for a multilevel modular matrix converter is investigated, which is required for applications to power systems and high power motor drives. The schemes of power flow control and capacitor voltage balancing control with voltage space vector modulation have been proposed. However, these control schemes have the problem they cause zero sequence current that affects protection for power systems and motors. To reduce the zero sequence current, the control scheme that suppresses zero sequence voltage by compensating voltage difference between input and output systems is proposed in this paper. Numerical simulation of a 9-level modular matrix converter and experiments using a 2-kW 5-level modular matrix converter are conducted to verify the control scheme.