EPE Association: EPE 2013 - LS8b: Generator Converter Control

EPE 2013 - LS8b: Generator Converter Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 14: Converters for rotating and linear generators > EPE 2013 - LS8b: Generator Converter Control

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   A Simple and Reliable Rectifier for Variable Speed SCIG Wind Turbines by Using Series Reactive Compensator Named MERS
By Takanori ISOBE, Toshisato OONO, Takayuki KAWAGUCHI, Ryuichi SHIMADA [View]
[Download]

Abstract: This paper presents a simple rectifier configuration for SCIG (squirrel cage induction generator) applied to variable speed wind turbines. The proposed rectifier consists of a diode rectifier and a series reactive power compensator named MERS. Advantages of this configuration are reduced active semi-conductor device rating needed and line frequency switching operation of the series compensator. Experimental results with a 1.5~kW SCIG are shown.

   Dc-link Capacitance Reduction in a High Power Medium Voltage Modular Wind Power Converter
By Xibo YUAN, Alex LOVETT [View]
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Abstract: With the increasing power rating of large multi-MW wind turbines, medium voltage power conversion is preferred in terms of high power density, reduced current level and reduced cable and switchgear cost. This paper has presented a multilevel high power converter topology suitable for 10kV, 10MW wind power conversion. A special investigation has been given to the reduction of the large dc-link capacitor of the converter, which is expensive, bulky and not reliable. The grid-side (transformer secondary side) inverter is actively controlled to compensate the single-phase pulsating power from the generator (H-bridge) side. Therefore, less dc-link capacitor is needed to smooth the low-frequency power ripple. The proposed method does not affect grid power quality, albeit introducing harmonic current in the transformer secondary side. The impact of the proposed control strategy on the converter and transformer current rating and thermal performance has also been analysed and simulated. The control scheme has been experimentally validated in a single converter cell.

   Efficiency and Reliability Improvement in Wind Turbine Converters by Grid Converter Adaptive Control
By Ionut TRINTIS, Stig MUNK-NIELSEN, Flemming ABRAHAMSEN, Paul THØGERSEN [View]
[Download]

Abstract: This paper presents a control method that reduces the losses in wind turbine converters adaptively controllingthe grid converter. The dc-link voltage adapts its reference based on the system state and thereforereduces the stored energy, and is therefore kept at the minimum necessary for the grid and generator side.Operating in this way, the electrical and thermal stress factors are decreased on the power electronic devices,increasing their lifetime. The simulation results using this method show efficiency increase anddevices temperature cycles slightly decreased. Experimental results on a wind turbine power stack showsefficiency increase in the high power region.

EPE 2013 - LS8b: Generator Converter Control
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 14: Converters for rotating and linear generators > EPE 2013 - LS8b: Generator Converter Control
	[return to parent folder]

	A Simple and Reliable Rectifier for Variable Speed SCIG Wind Turbines by Using Series Reactive Compensator Named MERS By Takanori ISOBE, Toshisato OONO, Takayuki KAWAGUCHI, Ryuichi SHIMADA	[View] [Download]
Abstract: This paper presents a simple rectifier configuration for SCIG (squirrel cage induction generator) applied to variable speed wind turbines. The proposed rectifier consists of a diode rectifier and a series reactive power compensator named MERS. Advantages of this configuration are reduced active semi-conductor device rating needed and line frequency switching operation of the series compensator. Experimental results with a 1.5~kW SCIG are shown.

	Dc-link Capacitance Reduction in a High Power Medium Voltage Modular Wind Power Converter By Xibo YUAN, Alex LOVETT	[View] [Download]
Abstract: With the increasing power rating of large multi-MW wind turbines, medium voltage power conversion is preferred in terms of high power density, reduced current level and reduced cable and switchgear cost. This paper has presented a multilevel high power converter topology suitable for 10kV, 10MW wind power conversion. A special investigation has been given to the reduction of the large dc-link capacitor of the converter, which is expensive, bulky and not reliable. The grid-side (transformer secondary side) inverter is actively controlled to compensate the single-phase pulsating power from the generator (H-bridge) side. Therefore, less dc-link capacitor is needed to smooth the low-frequency power ripple. The proposed method does not affect grid power quality, albeit introducing harmonic current in the transformer secondary side. The impact of the proposed control strategy on the converter and transformer current rating and thermal performance has also been analysed and simulated. The control scheme has been experimentally validated in a single converter cell.

	Efficiency and Reliability Improvement in Wind Turbine Converters by Grid Converter Adaptive Control By Ionut TRINTIS, Stig MUNK-NIELSEN, Flemming ABRAHAMSEN, Paul THØGERSEN	[View] [Download]
Abstract: This paper presents a control method that reduces the losses in wind turbine converters adaptively controllingthe grid converter. The dc-link voltage adapts its reference based on the system state and thereforereduces the stored energy, and is therefore kept at the minimum necessary for the grid and generator side.Operating in this way, the electrical and thermal stress factors are decreased on the power electronic devices,increasing their lifetime. The simulation results using this method show efficiency increase anddevices temperature cycles slightly decreased. Experimental results on a wind turbine power stack showsefficiency increase in the high power region.