Decoupled generation with additional degree of freedom

The paper presents adjustable speed generation system with a newly designed and built axial flux shaftless and bearingless permanent magnet generator and power electronic converter acting as a universal ac power source. Speed of the prime mover is adjusted to meet load demand by real time load measurement and calculation. Thus the power electronics converter decouples the generator and load and then rotation of the generator is not related to electrical power system stability. Such a system has another degree of freedom related to speed The system is controlled by DSP processor and provides high quality of output power. The results of tests of 40 kVA power system driven by diesel engine are related to steady state operation and transients. The system can operate with 100% asymmetrical load with any impact to the quality of the output voltage. Oscillograms of step load operation confirm ability to accept 20% step load without any voltage distortion.