EPE Association: EPE 2009 - Subtopic 14-5 - LS: 'Reactive Power Control for the Wind Farm Voltage Stabilation'

EPE 2009 - Subtopic 14-5 - LS: 'Reactive Power Control for the Wind Farm Voltage Stabilation'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 14: 'Electrical Energy Generating Systems, Renewable Energy Systems' > EPE 2009 - Subtopic 14-5 - LS: 'Reactive Power Control for the Wind Farm Voltage Stabilation'

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   EVALUATION OF GENERATOR-SETS WITH POWER FACTOR CORRECTION CIRCUITS
By Volker PICKERT, Ahmed AL-BUSAIDI, Dimitrios KALPAKTSOGLOU [View]
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Abstract: Published work on the development of series hybrid electric vehicles (SHEVs) has always been directed towards volume and weight reduction for traction batteries and the electric drives with little attention into the generator-sets. This paper presents an overview as well as a comparison of conventional and unconventional power factor (PF) correction techniques applied to generator-sets operating in series hybrid electric vehicles (SHEV). The aim is to determine which rectifier topology demonstrates both: high PF, high output voltage and high efficiencies. Conventional PF correction techniques such as PWM operated rectifiers run at high switching frequencies, resulting in high switching losses. Controlled series compensator (CSC) rectifiers, which have been used in power transmission lines to improve the power factor, operate at much lower switching frequency, compared to conventional PWM controlled rectifiers, promising a reduction in switching losses, without PF degradation. The CSC rectifiers are less known in automotive and therefore here regarded as unconventional. The operation and performance of various topologies for both conventional and unconventional PF correction techniques for SHEVs is discussed and simulated using Matlab/Simulink. Simulation results in terms of the first harmonic of the phase current, total harmonic current distortion (THD), PF, output voltage and efficiency is provided. It is concluded that the switched variable capacitor (SVC) circuit is the most promising PF correction circuit for generators operating constant speed.

   Local supervisory algorithm for reactive power dispatching in a wind farm
By tarak GHENNAM [View]
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Abstract: Doubly fed induction generators (DFIG) are more and more used in wind farms. Their reactive power generation capabilities are related to their operating points (wind speeds). This paper describes a hierarchical supervisory of the reactive power in a wind farm and focuses on the reactive power local supervisory unit of each DFIG based wind generator. In this context, a local supervisory algorithm is proposed for reactive power dispatching by taking into account three modes of wind farm operating.

   Terminal Voltage Control of Stand Alone Induction Generator Using Controlled Shunt Capacitor called SVC MERS
By Fransisco DANANG WIJAYA, Takanori ISOBE, Jan WIIK, Ryuichi SHIMADA [View]
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Abstract: This paper proposes controlled shunt capacitor called static var compensation magnetic energy recovery switch (SVC MERS) for self-excited induction generator terminal voltage control. The proposed system consists of bi-directional switch, dc capacitor and inductor as a filter. Operation principle and characteristics are presented. A small scale experiment was conducted to verify the proposed system. The experiment results proved a good performance when being applied for self excited induction generator terminal voltage control in load and speed varying conditions. This system has the following advantages: (i) simple control implementation using voltage feedback control with PI controller (ii) low switching frequency with zero current turn on and zero voltage turn off resulting in low switching losses. Moreover, the experimental results show that capacity rating reduction of SVC MERS of about 54\% can be achieved by installing fixed capacitor in parallel to the stator terminal.

EPE 2009 - Subtopic 14-5 - LS: 'Reactive Power Control for the Wind Farm Voltage Stabilation'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 14: 'Electrical Energy Generating Systems, Renewable Energy Systems' > EPE 2009 - Subtopic 14-5 - LS: 'Reactive Power Control for the Wind Farm Voltage Stabilation'
	[return to parent folder]

	EVALUATION OF GENERATOR-SETS WITH POWER FACTOR CORRECTION CIRCUITS By Volker PICKERT, Ahmed AL-BUSAIDI, Dimitrios KALPAKTSOGLOU	[View] [Download]
Abstract: Published work on the development of series hybrid electric vehicles (SHEVs) has always been directed towards volume and weight reduction for traction batteries and the electric drives with little attention into the generator-sets. This paper presents an overview as well as a comparison of conventional and unconventional power factor (PF) correction techniques applied to generator-sets operating in series hybrid electric vehicles (SHEV). The aim is to determine which rectifier topology demonstrates both: high PF, high output voltage and high efficiencies. Conventional PF correction techniques such as PWM operated rectifiers run at high switching frequencies, resulting in high switching losses. Controlled series compensator (CSC) rectifiers, which have been used in power transmission lines to improve the power factor, operate at much lower switching frequency, compared to conventional PWM controlled rectifiers, promising a reduction in switching losses, without PF degradation. The CSC rectifiers are less known in automotive and therefore here regarded as unconventional. The operation and performance of various topologies for both conventional and unconventional PF correction techniques for SHEVs is discussed and simulated using Matlab/Simulink. Simulation results in terms of the first harmonic of the phase current, total harmonic current distortion (THD), PF, output voltage and efficiency is provided. It is concluded that the switched variable capacitor (SVC) circuit is the most promising PF correction circuit for generators operating constant speed.

	Local supervisory algorithm for reactive power dispatching in a wind farm By tarak GHENNAM	[View] [Download]
Abstract: Doubly fed induction generators (DFIG) are more and more used in wind farms. Their reactive power generation capabilities are related to their operating points (wind speeds). This paper describes a hierarchical supervisory of the reactive power in a wind farm and focuses on the reactive power local supervisory unit of each DFIG based wind generator. In this context, a local supervisory algorithm is proposed for reactive power dispatching by taking into account three modes of wind farm operating.

	Terminal Voltage Control of Stand Alone Induction Generator Using Controlled Shunt Capacitor called SVC MERS By Fransisco DANANG WIJAYA, Takanori ISOBE, Jan WIIK, Ryuichi SHIMADA	[View] [Download]
Abstract: This paper proposes controlled shunt capacitor called static var compensation magnetic energy recovery switch (SVC MERS) for self-excited induction generator terminal voltage control. The proposed system consists of bi-directional switch, dc capacitor and inductor as a filter. Operation principle and characteristics are presented. A small scale experiment was conducted to verify the proposed system. The experiment results proved a good performance when being applied for self excited induction generator terminal voltage control in load and speed varying conditions. This system has the following advantages: (i) simple control implementation using voltage feedback control with PI controller (ii) low switching frequency with zero current turn on and zero voltage turn off resulting in low switching losses. Moreover, the experimental results show that capacity rating reduction of SVC MERS of about 54\% can be achieved by installing fixed capacitor in parallel to the stator terminal.