EPE Association: Pelincec 2005 - 22: WATAB I

Pelincec 2005 - 22: WATAB I - Ph.D. Student Forum
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > Pelincec 2005 > Pelincec 2005 - 22: WATAB I - Ph.D. Student Forum

   [return to parent folder]

   Voltage Asymmetry Correction in a Stand – Alone Slip – Ring Induction Generator During Unbalance Load Supply
By Grzegorz Iwanski, Wlodzimierz Koczara [View]
[Download]

Abstract: The following paper presents a slip-ring induction generator operated in the stand alone mode. The sensorless control method called Direct Voltage Control allows for fixed amplitude and frequency of the generated stator voltage. The star connected stator permits the unbalanced load can be supplied from the generator. However the neutral wire must be connected to the stator neutral point. In unbalanced load supply case the control method consist of two parts. The main part is responsible for the stator voltage amplitude, frequency and phase, whereas the second part is responsible for the stator voltage asymmetry correction. The positive and negative sequence components of the stator voltage vector represented in the two independent coordinates systems are used in the control system. An proposed Direct Voltage Control method equipped in voltage asymmetry correction algorithm was proved in the simulation and laboratory tests and the results are presented in the paper.

   Experimental Characterization of electrical faults in a doubly fed induction machine (DFIM) for wind power generation
By Domenico Casadei, Fiorenzo Filippetti, Claudio Rossi, Andrea Stefani, Amine Yazidi [View]
[Download]

Abstract: Wind energy is one of the most important and promising sources of renewable energy all over the world. The doubly fed induction machine is an important component of wind turbine systems. These generators are displaced in quite inaccessible areas so it is necessary to provide them with a remote monitoring system in order to avoid undesirable operating conditions and to detect and diagnose incipient faults. The behaviour of the generator is influenced by the control system, so the diagnostic indexes usually utilized for mains supplied machines are no longer reliable. In this paper simulations and experimental results show that the spectra of rotor input modulating signals have suitable features that can lead to an effective diagnostic procedure.

   AC-DC integrated load flow calculation for variable speed offshore wind farms
By Menghua Zhao, Z. Chen, F. Blaabjerg [View]
[Download]

Abstract: This paper proposes a sequential AC-DC integrated load flow algorithm for variable speed offshore wind farms. In this algorithm, the variable frequency and the control strategy of variable speed wind turbine systems are considered. In addition, the losses of wind turbine systems and the losses of converters are also integrated into the load flow algorithm. As a general algorithm, it can be applied to different types of wind farm configurations, and the load flow is related to the wind speed.

   SYNCHRONISED PULSEWIDTH MODULATION FOR CONTROL OF INVERTER-FED OPEN-END WINDING MOTOR DRIVES
By V. Oleschuk, F. Profumo, A. Tenconi, R. Bojoi [View]
[Download]

Abstract: This paper presents results of investigation of dual inverter-fed open-end winding drive systems, controlled in accordance with rules and algorithms of novel methodology of synchronised space-vector modulation. Both continuous and discontinuous versions of synchronised pulsewidth modulation have been analyzed and compared with application to these systems. The proposed algorithms of synchronised PWM provide quarter-wave symmetry of actual motor phase voltage, and its spectra do not contain even harmonics and sub-harmonics (combined harmonics), which is especially important for the systems with increased power rate. Simulations give the behavior of the proposed methods and techniques of synchronised PWM, applied to open-end winding motor drives.

Pelincec 2005 - 22: WATAB I - Ph.D. Student Forum
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > Pelincec 2005 > Pelincec 2005 - 22: WATAB I - Ph.D. Student Forum
	[return to parent folder]

	Voltage Asymmetry Correction in a Stand – Alone Slip – Ring Induction Generator During Unbalance Load Supply By Grzegorz Iwanski, Wlodzimierz Koczara	[View] [Download]
Abstract: The following paper presents a slip-ring induction generator operated in the stand alone mode. The sensorless control method called Direct Voltage Control allows for fixed amplitude and frequency of the generated stator voltage. The star connected stator permits the unbalanced load can be supplied from the generator. However the neutral wire must be connected to the stator neutral point. In unbalanced load supply case the control method consist of two parts. The main part is responsible for the stator voltage amplitude, frequency and phase, whereas the second part is responsible for the stator voltage asymmetry correction. The positive and negative sequence components of the stator voltage vector represented in the two independent coordinates systems are used in the control system. An proposed Direct Voltage Control method equipped in voltage asymmetry correction algorithm was proved in the simulation and laboratory tests and the results are presented in the paper.

	Experimental Characterization of electrical faults in a doubly fed induction machine (DFIM) for wind power generation By Domenico Casadei, Fiorenzo Filippetti, Claudio Rossi, Andrea Stefani, Amine Yazidi	[View] [Download]
Abstract: Wind energy is one of the most important and promising sources of renewable energy all over the world. The doubly fed induction machine is an important component of wind turbine systems. These generators are displaced in quite inaccessible areas so it is necessary to provide them with a remote monitoring system in order to avoid undesirable operating conditions and to detect and diagnose incipient faults. The behaviour of the generator is influenced by the control system, so the diagnostic indexes usually utilized for mains supplied machines are no longer reliable. In this paper simulations and experimental results show that the spectra of rotor input modulating signals have suitable features that can lead to an effective diagnostic procedure.

	AC-DC integrated load flow calculation for variable speed offshore wind farms By Menghua Zhao, Z. Chen, F. Blaabjerg	[View] [Download]
Abstract: This paper proposes a sequential AC-DC integrated load flow algorithm for variable speed offshore wind farms. In this algorithm, the variable frequency and the control strategy of variable speed wind turbine systems are considered. In addition, the losses of wind turbine systems and the losses of converters are also integrated into the load flow algorithm. As a general algorithm, it can be applied to different types of wind farm configurations, and the load flow is related to the wind speed.

	SYNCHRONISED PULSEWIDTH MODULATION FOR CONTROL OF INVERTER-FED OPEN-END WINDING MOTOR DRIVES By V. Oleschuk, F. Profumo, A. Tenconi, R. Bojoi	[View] [Download]
Abstract: This paper presents results of investigation of dual inverter-fed open-end winding drive systems, controlled in accordance with rules and algorithms of novel methodology of synchronised space-vector modulation. Both continuous and discontinuous versions of synchronised pulsewidth modulation have been analyzed and compared with application to these systems. The proposed algorithms of synchronised PWM provide quarter-wave symmetry of actual motor phase voltage, and its spectra do not contain even harmonics and sub-harmonics (combined harmonics), which is especially important for the systems with increased power rate. Simulations give the behavior of the proposed methods and techniques of synchronised PWM, applied to open-end winding motor drives.