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Electric Power Applications, IEE Proceedings B

Issue 5 • Date September 1984

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Displaying Results 1 - 12 of 12
  • Probabilistic representation of harmonic currents in AC traction systems

    Publication Year: 1984 , Page(s): 181 - 189
    Cited by:  Papers (8)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (907 KB)  

    A probabilistic model is proposed to represent harmonic currents generated by thyristor-controlled AC locomotives. The model is used in a Monte Carlo simulation to predict traction feeder-station currents. The results of the simulation are compared with results obtained from tests on a 25 kV AC railway. View full abstract»

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  • Rheostatic stabilisation of a chopper-controlled brake for traction drives

    Publication Year: 1984 , Page(s): 190 - 194
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (694 KB)  

    This paper describes a means of dealing with and compensating for line-voltage decreases in chopper-controlled regenerative-brake equipment. The method of correction involves using a rheostatic brake resistor which is commonly available in such equipment and requies no extra power electronic circuit components. Electric braking can be maintained under all specified line-voltage conditions, as well as with a short circuit on the power supply line. With this arrangement full protection of the traction and chopper equipment is provided. A fast acting controller is proposed consisting of a closed-loop peak-current inner feedback loop with an outer loop controlling average armature current. Results of practical tests on a 250 A 400 V chopper are supported by numerically predicted results, obtained using a digital computer. View full abstract»

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  • PWM switching strategies for current-fed inverter drives

    Publication Year: 1984 , Page(s): 195 - 202
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1332 KB)  

    Quasi-square-wave current-fed inverter drives suffer from low-speed torque pulsations, which can cause mechanical resonances and speed ripple problems. Attempts to minimise these problems, using PWM switching strategies based on harmonic elimination techniques, have been reported. It is shown that these PWM switching strategies are based on unnecessarily restrictive modulation rules, and that these rules may be relaxed to allow more versatile PWM switching strategies to be used to improve system performance. New, more flexible, modulation rules are presented, based on the duality relationship which exists between the PWM voltage-fed inverter and the PWM current-fed inverter. These new modulation rules are confirmed using practical results obtained from an experimental microprocessor-based PWM current-fed inverter drive. View full abstract»

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  • Influence of rotor-bar stiffness on the critical speed of an induction motor with an aluminium squirrel cage

    Publication Year: 1984 , Page(s): 203 - 208
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (570 KB)  

    Most authors, dealing with electromagnetically induced vibrational phenomena in rotating machines, consider the mechanical parameters (spring constant, damping coefficient) to be known. In the paper we will show that the generally made approximations for the calculation of these mechanical parameters are no longer acceptable when considering aluminium rotors. Therefore a more accurate method has been worked out taking into account the rotor-cage stiffness. The results are then compared with experimentally obtained values. These experiments have been made using the modal analysis method. View full abstract»

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  • Switched reluctance motor drives for rail traction: relative assessment

    Publication Year: 1984 , Page(s): 209 - 219
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1356 KB)  

    The paper reports an assessment of the technical and economic benefits of switched reluctance motor systems applied to railway propulsion in motor sizes of 100¿200 kW. Several forms of power electronic circuit have been considered for providing the pulsed DC supply required. Comparison is made with inverter-fed induction motor drives using conventional McMurray three-phase PWM thyristor inverters. Further comparisons are drawn against chopper-fed DC motor systems such as are currently entering service on various railways. It is concluded that the motor itself should offer lower maintenance requirements, higher reliability and a greater power/weight ratio than either the induction motor or the DC motor. The total system, however, appears to show no clear benefits over the induction motor system, and both types are at present more expensive than DC motor systems. (A second view on switched reluctance motor drives by Ray et al. is also published in the same issue.) View full abstract»

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  • Switched reluctance motor drives for rail traction: a second view

    Publication Year: 1984 , Page(s): 220 - 225
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (777 KB)  

    The authors first describe the basis of the original feasibility study drawn on by French in his paper (published in the same issue). They then discuss a sound basis for comparison between an SR drive and an inverter-fed induction motor drive in a particular traction application, commenting on a number of underlying inadequacies in the comparison which French makes in his paper. Finally, they outline a recast design for the SR drive based on published circuits and the feasibility study data which, taken with a more closely comparable performance characteristic, demonstrates considerable cost savings for the SR system. View full abstract»

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  • Discussion on Electrification of Taiwan main-line railway from Keelung to Kaohsiung

    Publication Year: 1984 , Page(s): 226 - 230
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (760 KB)  

    It is of particular pleasure to me to join in this discussion, as I was in the consultancy team working in the early 1970s whose report led to the project. It is interesting, and does credit to the team members, that the implemented project follows so closely the recommendations made in 1971. There are a few differences, and I shall ask some questions about those differences. View full abstract»

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  • Steady-state performance of PWM inverter drives

    Publication Year: 1984
    Save to Project icon | PDF file iconPDF (112 KB)  
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  • Reply: Steady-state performance of PWM inverter drives

    Publication Year: 1984
    Save to Project icon | PDF file iconPDF (183 KB)  
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  • Design of phase-change two-speed windings for induction motors, using pole-amplitude modulation techniques

    Publication Year: 1984 , Page(s): 232 - 233
    Save to Project icon | PDF file iconPDF (336 KB)  
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  • Reply: Design of phase-change two-speed windings for induction motors, using pole-amplitude modulation techniques

    Publication Year: 1984 , Page(s): 233 - 234
    Save to Project icon | PDF file iconPDF (245 KB)  
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  • Book review: Power Electronics

    Publication Year: 1984 , Page(s): 234 - 235
    Save to Project icon | PDF file iconPDF (221 KB)  
    Freely Available from IEEE