Evaluation of the SVIAB 065 Wind Energy Conversion System for Battery Charging

摘要

This report contains the final evaluation of the SVIAB SWECS 065, a wind energy conversion system for battery charging. The measurements were performed at the Test Station of SWECS in Fiskebaeck, Goeteborg, build and operated by the Chalmers University of Technology. The 065 is a horizontal axis, upwind, three bladed WECS with a low speed Assar generator, that is, a self-excited synchronous generator without slip rings. A three phase rectifier provides the DC voltage for battery charging. The power is controlled by a pendular vane which, for wind speeds higher than 10 m/s makes the turbine to turn around the vertical axis out of the wind direction. The performance evaluation is based on about 20,000 samples of wind speed, power, speed and wind direction collected under February-May 1983. The system test comprises the measurement of the transients and the runaway speed when disconnecting the generator from the load, and observations of the behaviour of the pendular vane, both in normal and runaway operation. The results show a maximum power output of 500 W at 12.5 m/s, a cut in speed of about 3 m/s and a total efficiency of 21 to 25 percent between 5 and 10 m/s, which may be considered as satisfactory. Since the Assar generator has an efficiency of 56 percent max, the conclusion is that the Csub(p) is very high. The runaway speed doesn't exceed 1000 rpm in any case. The pendular vane works satisfactorily. The angle between the wind direction and the turbine shaft depends on the wind speed, not on the load. The unit was in continuous operation during the period December 1982-September 1983. No serious problems were detected during this time. (ERA citation 10:023737)