EPE Association: EPE 1997 - 02: Lecture Session L1b: RENEWABLE ENERGY SYSTEMS

EPE 1997 - 02: Lecture Session L1b: RENEWABLE ENERGY SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 - 02: Lecture Session L1b: RENEWABLE ENERGY SYSTEMS

   [return to parent folder]

   EFFICIENT PHOTOVOLTAIC PUMP SYSTEM USING A PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE
By S. Van Haute; St. Henneberger; K. Hameyer; R. Belmans; L. De Gheselle; W.Coppye; J. Nijs [View]
[Download]

Abstract: In photovoltaic pump systems, the solar array accounts for a substantial fraction of the overall system cost. Therefore, all system components must have a high efficiency in a large power range. Low voltage standard induction motors do not fit this criterion. Hence, a dedicated 3.8 kW permanent magnet synchronous motor for a surface application is designed, built and compared to a standard induction motor. A damper cage is added to the permanent magnet rotor to allow open loop control. The motor is fed by a modified IGBT inverter, equipped with a selectable constant voltage or a maximum power point tracking facility. Furthermore, particular attention is paid to matching of all system components yielding maximum overall system performance. The system output in terms of pumped water is simulated for different geographical locations. Finally, the results of this test set-up are used to design a motor-pump unit suited for submersion.

   SINGLE CELL MODULE INTEGRATED CONVERTER SYSTEM FOR PHOTOVOLTAIC ENERGY GENERATION
By J. Riatsch; H. Stemmler; R. Schmidt [View]
[Download]

Abstract: Important drawbacks of photovoltaics are the high costs, especially for the solar cells. The new single cell concept, presented in this paper, promises substantial cost savings. Single cells, however, generate only 1 .. 2V de. This paper deals with the challenging problem to convert this low de-voltage to 230Vac with an acceptable efficiency. It presents circuits, design criteria, mode of operation and a loss analysis with experimental verification. A prototype proved the feasibility of the converter concept and showed that conversion efficiencies in the range of 85% to 90% are realistic for a single cell application. The conversion efficiency mainly depends on the resistance of the input power circuit, which can be reduced by connecting MOSFET's in parallel. A long-lasting and maintenance-free operation during an operation time of more than 25 years is required for the converter. Avoiding electrolytic capacitors inside is, due to the converters hard environmental operation conditions like the extremely high temperature range of - 40° to +85° C and the daily temperature cycles, an important contribution to fulfil this requirement.

EPE 1997 - 02: Lecture Session L1b: RENEWABLE ENERGY SYSTEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 - 02: Lecture Session L1b: RENEWABLE ENERGY SYSTEMS
	[return to parent folder]

	EFFICIENT PHOTOVOLTAIC PUMP SYSTEM USING A PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVE By S. Van Haute; St. Henneberger; K. Hameyer; R. Belmans; L. De Gheselle; W.Coppye; J. Nijs	[View] [Download]
Abstract: In photovoltaic pump systems, the solar array accounts for a substantial fraction of the overall system cost. Therefore, all system components must have a high efficiency in a large power range. Low voltage standard induction motors do not fit this criterion. Hence, a dedicated 3.8 kW permanent magnet synchronous motor for a surface application is designed, built and compared to a standard induction motor. A damper cage is added to the permanent magnet rotor to allow open loop control. The motor is fed by a modified IGBT inverter, equipped with a selectable constant voltage or a maximum power point tracking facility. Furthermore, particular attention is paid to matching of all system components yielding maximum overall system performance. The system output in terms of pumped water is simulated for different geographical locations. Finally, the results of this test set-up are used to design a motor-pump unit suited for submersion.

	SINGLE CELL MODULE INTEGRATED CONVERTER SYSTEM FOR PHOTOVOLTAIC ENERGY GENERATION By J. Riatsch; H. Stemmler; R. Schmidt	[View] [Download]
Abstract: Important drawbacks of photovoltaics are the high costs, especially for the solar cells. The new single cell concept, presented in this paper, promises substantial cost savings. Single cells, however, generate only 1 .. 2V de. This paper deals with the challenging problem to convert this low de-voltage to 230Vac with an acceptable efficiency. It presents circuits, design criteria, mode of operation and a loss analysis with experimental verification. A prototype proved the feasibility of the converter concept and showed that conversion efficiencies in the range of 85% to 90% are realistic for a single cell application. The conversion efficiency mainly depends on the resistance of the input power circuit, which can be reduced by connecting MOSFET's in parallel. A long-lasting and maintenance-free operation during an operation time of more than 25 years is required for the converter. Avoiding electrolytic capacitors inside is, due to the converters hard environmental operation conditions like the extremely high temperature range of - 40° to +85° C and the daily temperature cycles, an important contribution to fulfil this requirement.