EPE Association: EPE 2016 - LS1f: Power Electronics in Transmission and Distribution Systems

EPE 2016 - LS1f: Power Electronics in Transmission and Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 06: Grids and Smart Grids > EPE 2016 - LS1f: Power Electronics in Transmission and Distribution Systems

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   Capacitor size reduction of MMC-based STATCOM for medium voltage power distribution network
By Takanori ISOBE [View]
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Abstract: This paper presents the capacitor size reduction of a MMC-based transformer-less STATCOM for medium voltage ac distribution system. The instantaneous power swinging flows into the single-phase configuration results in a high capacitance needed; however, by accepting the swinging voltage in the capacitor, the capacitance can be drastically reduced. This paper analyzes the dimensional size reduction of this method and thermal characteristics by using a meta-parameterization technique based on existing film capacitor technologies, and estimates that the dimensional size of the capacitor can be about 34\% of the conventional design.

   Implementation of an active RLC load for Unintentional Islanding Test
By Luca DALLA SANTA [View]
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Abstract: Inverters connected to electrical grids are required to properly detect islanding conditions, namely, the condition of operating isolated from the main grid. To verify the effectiveness of grid-tied converters in dealing with unintentional islanding conditions, test procedures based on resonant parallel RLC loads are recommended by standards. In this paper, we show the feasibility of using power electronic converters to implement active loads used to perform unintentional islanding tests. With this aim, the paper reports the implementation of an active RLC load by using a dc/ac converter. The equivalence of the emulated RLC load with respect to the desired one is shown by means of simulation and experimental results. An inverter having anti-islanding capabilities is considered in order to evaluate the suitability of the active load for unintentional islanding tests.

   Investigation of Renewable Energy Generation and Load Impact on the Grid Impedance at Different Points of Connection in Public Low Voltage Grids to Support Grid
By Lars JESSEN [View]
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Abstract: Due to an increasing number of distributed energy generation systems connected to low voltage grids,further investigations are required to ensure high power quality and power system stability. One importantpower system parameter is the frequency depending grid impedance at the points of connectionreferred to as grid impedance. This impedance considerably affects power quality and system stabilityespecially if remarkable resonances occur. In this paper, the grid impedance composition of differentpublic low voltage distribution systems is measured and analyzed. The primary objective is to revealthe contribution of load and solar power generation to the grid impedance and especially to resonances.This case study shows that grid impedance resonance strongly depends on loads and inductance of theupstream network in low voltage power systems. However, if the load impedance is very high or no loadis present, solar power plants lead to remarkable grid impedance resonances especially during nighttime.

   Voltage and current behavior in a FixReF controlled offshore wind farm using a HVDC transmission system based on uncontrolled diode rectifier units
By Cord PRIGNITZ [View]
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Abstract: Future HVDC systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters.Due to this wind turbine inverters must own a grid forming capability.This paper describes a control strategy that requires only minor changes in the conventional wind turbine inverter control software to form the AC voltage in the offshore island grid connected via diode rectifier HVDC link.

EPE 2016 - LS1f: Power Electronics in Transmission and Distribution Systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 06: Grids and Smart Grids > EPE 2016 - LS1f: Power Electronics in Transmission and Distribution Systems
	[return to parent folder]

	Capacitor size reduction of MMC-based STATCOM for medium voltage power distribution network By Takanori ISOBE	[View] [Download]
Abstract: This paper presents the capacitor size reduction of a MMC-based transformer-less STATCOM for medium voltage ac distribution system. The instantaneous power swinging flows into the single-phase configuration results in a high capacitance needed; however, by accepting the swinging voltage in the capacitor, the capacitance can be drastically reduced. This paper analyzes the dimensional size reduction of this method and thermal characteristics by using a meta-parameterization technique based on existing film capacitor technologies, and estimates that the dimensional size of the capacitor can be about 34\% of the conventional design.

	Implementation of an active RLC load for Unintentional Islanding Test By Luca DALLA SANTA	[View] [Download]
Abstract: Inverters connected to electrical grids are required to properly detect islanding conditions, namely, the condition of operating isolated from the main grid. To verify the effectiveness of grid-tied converters in dealing with unintentional islanding conditions, test procedures based on resonant parallel RLC loads are recommended by standards. In this paper, we show the feasibility of using power electronic converters to implement active loads used to perform unintentional islanding tests. With this aim, the paper reports the implementation of an active RLC load by using a dc/ac converter. The equivalence of the emulated RLC load with respect to the desired one is shown by means of simulation and experimental results. An inverter having anti-islanding capabilities is considered in order to evaluate the suitability of the active load for unintentional islanding tests.

	Investigation of Renewable Energy Generation and Load Impact on the Grid Impedance at Different Points of Connection in Public Low Voltage Grids to Support Grid By Lars JESSEN	[View] [Download]
Abstract: Due to an increasing number of distributed energy generation systems connected to low voltage grids,further investigations are required to ensure high power quality and power system stability. One importantpower system parameter is the frequency depending grid impedance at the points of connectionreferred to as grid impedance. This impedance considerably affects power quality and system stabilityespecially if remarkable resonances occur. In this paper, the grid impedance composition of differentpublic low voltage distribution systems is measured and analyzed. The primary objective is to revealthe contribution of load and solar power generation to the grid impedance and especially to resonances.This case study shows that grid impedance resonance strongly depends on loads and inductance of theupstream network in low voltage power systems. However, if the load impedance is very high or no loadis present, solar power plants lead to remarkable grid impedance resonances especially during nighttime.

	Voltage and current behavior in a FixReF controlled offshore wind farm using a HVDC transmission system based on uncontrolled diode rectifier units By Cord PRIGNITZ	[View] [Download]
Abstract: Future HVDC systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters.Due to this wind turbine inverters must own a grid forming capability.This paper describes a control strategy that requires only minor changes in the conventional wind turbine inverter control software to form the AC voltage in the offshore island grid connected via diode rectifier HVDC link.