EPE Association: EPE 1995 - 20 - Lecture Session L5d: CONVERTERS FOR RENEWABLE ENERGIES

EPE 1995 - 20 - Lecture Session L5d: CONVERTERS FOR RENEWABLE ENERGIES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 20 - Lecture Session L5d: CONVERTERS FOR RENEWABLE ENERGIES

   [return to parent folder]

   TRANSPUTER-BASED CONTROL OF A SWITCHED RELUCTANCE GENERATOR FOR WIND ENERGY APPLICATIONS
By R. Cardenas; W. F. Ray; G. M. Asher [View]
[Download]

Abstract: Variable speed operation of horizontal wind turbines has several potential advantages over fixed speed machines; additional energy capture, reduction in audible noise, etc. Several configurations of electrical generator and control system are presently used in wind energy applications. This paper describes another potential competitor for these applications, the switched reluctance generator which has very good characteristic in term of efficiency, control simplicity and robustness.

   IMPLEMENTATION OF VECTOR CONTROL STRATEGIES FOR A VARIABLE SPEED DOUBLY-FED INDUCTION MACIIlNE FOR WIND GENERATION SYSTEM
By R.S. Pena; J.C. Clare; G.M. Asher [View]
[Download]

Abstract: An implementation of a PWM Scherbius scheme for a doubly-fed induction machine (DFIM) driven by a wind turbine is presented. Two back-to-back voltage-fed current-regulated inverters are used allowing sub and super synchronous operation with low distortion currents. The machine is controlled using a vector control technique choosing a referenc1e frame oriented along the stator flux vector position leading to an independent control of the electrical torque and the rotor excitation current. The front-end converter is also controlled using a vector control approach with a reference frame aligned along the stator voltage vector position resulting in an independent control of the active and reactive power flow between the supply and the converter. The control strategies are tested with the machine working as a variable speed constant frequency generator driven by a wind turbine. Two approaches for optimum speed tracking of the wind turbine are implemented. Experimental results for a prototype system are presented.

   A MODULAR UTILITY INTERFACE FOR PHOTOVOLTAIC POWER PLANTS
By E. T. Schönholzer; R. Schmidhauser [View]
[Download]

Abstract: This paper presents a new de to three-phase power converter, applicable to medium size utility grid connected photovoltaic power plants. Advantage is taken of the availability of an advanced, rugged inverter manufactured in large quantities for ac drives. Several switch-mode dc/dc converters with maximum power trackers adapt distributed pv-arrays and feed the common inverter dc-bus.

   INVERTERS WITHOUT TRANSFORMER IN GRID CONNECTED PHOTOVOLTAIC APPLICATIONS
By M. Meinhardt; P. Mutschler [View]
[Download]

Abstract: It is proposed to omit the transformer in inverters for grid connected photovoltaic systems in order to reduce losses, costs and size. With respect to the level of the dc-voltage and the leakage current, 3-phase CSI and VSI and 1-phase three level VSI are discussed in more detail. The leakage current is reduced greatly by novel control methods and additional passive components. Adaptive control according to varying environmental influences leads to improved systems behavior.

EPE 1995 - 20 - Lecture Session L5d: CONVERTERS FOR RENEWABLE ENERGIES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 20 - Lecture Session L5d: CONVERTERS FOR RENEWABLE ENERGIES
	[return to parent folder]

	TRANSPUTER-BASED CONTROL OF A SWITCHED RELUCTANCE GENERATOR FOR WIND ENERGY APPLICATIONS By R. Cardenas; W. F. Ray; G. M. Asher	[View] [Download]
Abstract: Variable speed operation of horizontal wind turbines has several potential advantages over fixed speed machines; additional energy capture, reduction in audible noise, etc. Several configurations of electrical generator and control system are presently used in wind energy applications. This paper describes another potential competitor for these applications, the switched reluctance generator which has very good characteristic in term of efficiency, control simplicity and robustness.

	IMPLEMENTATION OF VECTOR CONTROL STRATEGIES FOR A VARIABLE SPEED DOUBLY-FED INDUCTION MACIIlNE FOR WIND GENERATION SYSTEM By R.S. Pena; J.C. Clare; G.M. Asher	[View] [Download]
Abstract: An implementation of a PWM Scherbius scheme for a doubly-fed induction machine (DFIM) driven by a wind turbine is presented. Two back-to-back voltage-fed current-regulated inverters are used allowing sub and super synchronous operation with low distortion currents. The machine is controlled using a vector control technique choosing a referenc1e frame oriented along the stator flux vector position leading to an independent control of the electrical torque and the rotor excitation current. The front-end converter is also controlled using a vector control approach with a reference frame aligned along the stator voltage vector position resulting in an independent control of the active and reactive power flow between the supply and the converter. The control strategies are tested with the machine working as a variable speed constant frequency generator driven by a wind turbine. Two approaches for optimum speed tracking of the wind turbine are implemented. Experimental results for a prototype system are presented.

	A MODULAR UTILITY INTERFACE FOR PHOTOVOLTAIC POWER PLANTS By E. T. Schönholzer; R. Schmidhauser	[View] [Download]
Abstract: This paper presents a new de to three-phase power converter, applicable to medium size utility grid connected photovoltaic power plants. Advantage is taken of the availability of an advanced, rugged inverter manufactured in large quantities for ac drives. Several switch-mode dc/dc converters with maximum power trackers adapt distributed pv-arrays and feed the common inverter dc-bus.

	INVERTERS WITHOUT TRANSFORMER IN GRID CONNECTED PHOTOVOLTAIC APPLICATIONS By M. Meinhardt; P. Mutschler	[View] [Download]
Abstract: It is proposed to omit the transformer in inverters for grid connected photovoltaic systems in order to reduce losses, costs and size. With respect to the level of the dc-voltage and the leakage current, 3-phase CSI and VSI and 1-phase three level VSI are discussed in more detail. The leakage current is reduced greatly by novel control methods and additional passive components. Adaptive control according to varying environmental influences leads to improved systems behavior.