Control of a wind-driven self-excited induction generator water-pumping system for maximum utilization efficiency
This paper analyzes a stand-alone water-pumping system consisting of a motor-pump set supplied by a wind-driven self-excited induction generator. In order to achieve maximum utilization efficiency, the system designer is interested in optimally matching the system components together so that maximum energy available from the wind is absorbed and utilized all the time. Unfortunately, this optimal matching is speed-dependent and hence no single matching is valid for all wind speeds. Therefore the operating point of the system must vary with wind speed. In this paper, a control strategy is formulated which properly adjust the operating point of the system to coincide with the maximum power operating condition. The self-excited induction generator (SEIG) is basically an induction machine which is driven by a prime mover such as a wind turbine while a capacitor is connected across its stator terminals. The SEIG supplies an induction motor which is coupled to a water pump. The system need not operate continuously and water can be used directly for drinking and irrigation or it can be collected in a storage tank for later use. Due to the high cost of the wind turbine and equipment, the system designer is interested in maximizing the amount of pumped water per day. This can be achieved by proper selection and matching of the system components. However, proper matching of the system components together is not sufficient to guarantee maximum utilization since matching is dependent on wind speed. Therefore, certain system components must be controlled according to wind speed, such that matching is achieved all the time. This paper presents a control strategy to control the excitation capacitance of the induction generator such that its generated terminal voltage, which is applied to the induction motor, is kept constant as the rotor speed varies with wind speed.
- Research Organization:
- King Saud University, Riyadh (SA)
- OSTI ID:
- 20000204
- Resource Relation:
- Conference: 33rd Intersociety Energy Conversion Engineering Conference, Colorado Springs, CO (US), 08/02/1998--08/06/1998; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows 95/NT; Macintosh; UNIX. All systems need 2X CD-ROM drive., PBD: 1998; Related Information: In: Proceedings of the 33. intersociety energy conversion engineering conference, by Anghaie, S. [ed.], [2800] pages.
- Country of Publication:
- United States
- Language:
- English
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