An investigation into voltage modulation in aircraft V.S.C.F. systems
Abstract
Fixed frequency alternating voltage for aircraft primary electrical power may be generated by the variable speed constant frequency technique in which the variable frequency power from an engine-drive alternator is converted to a fixed frequency by using a power electronic frequency changer known as a cycloconverter. Modulation produced by an ideal cycloconverter is simulated and the excessive amplitude modulation exhibited by the alternating output voltage waveform is investigated. A large reduction in modulation is possible by the controlled addition of third harmonic distortion into the reference signal. Studies of practical aspects of amplitude modulation show that large levels are caused by distorted analog control waveforms.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- March 1978
- Bibcode:
- 1978PhDT........55P
- Keywords:
-
- Aircraft Engines;
- Alternating Current;
- Amplitude Modulation;
- Frequency Control;
- Computerized Simulation;
- Frequency Converters;
- Harmonic Generators;
- Voltage Converters (Ac To Ac);
- Electronics and Electrical Engineering