Application of Ultrahigh Speed Induction Machine for Waste or Renewable Energy Recovery

Abstract

Applications of Ultrahigh Speed Induction Machine (USIM) in a system developed for utilization of renewable and waste energies is described. It can be applied in Distributed Generation Systems. The energy conversion is made by a turbine-generator set. USIM has a number of technical and economical benefits over synchronous generators. The following studies are presented: scalar speed control of the turbine-generator set applying an accurate and approximate model, the adverse effect of subharmonics generated by the PWM controlled voltage source converter and a novel self-excitation method developed specially for ultrahigh speed induction generators.

Keywords

• Waste Energy Recovery System, Ultrahigh Speed Drive, Subharmonics, Self Excitation

Kaynakça

1. Ω*=0.8056pu, respectively. Near rated load torque the f1 synchronous frequency determined by the controller are f1=0.9997 pu=1499.5 Hz (Fig.5b) and f1=0.7998 pu=1199.7 Hz (Fig.6b). As it can be seen the trace of Ψobtained by test and simulation are similar. is Ω*=1.0058pu and Figure 5c and 6c show the trajectory of the stator flux of USIM denoted by Ψs when theR stator resistance is taken into consideration. The amplitude of the subharmonicstatorflux vector ˆ
2. Fig.9.Simulation results. f1 = 1500 Hz, D = 0.25, fs = 30 kHz, time function of iCR, iL2, iL1, iC and vC Conclusion Research results obtained during the development of a system that can be applied to utilize renewable and waste energies in Distributed
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38. Rated parameter of USIM Symbol Name SI pu Pn ˆ V1 5 kW Peak value of phase voltage V pu ˆI Peak value of phase current 5 pu f1n ˆ 1 Hz pu Peak value of stator flux 8 mVsec 1 pu τn Rated torque 4805 Nm 1 pu τbm
39. Maximum torque in mot. mode 156 Nm sb slip at max torque 0275 sn rated slip 00642 21 Ω 1565 Ω 98 Ω 98 Ω 6 Ω Xm magnetizing reactance p number of pole pairs Tm electromechanical time constant 46 s