Accuracy improvement for complex harmonic analysis modelling of a wound field synchronous generator

Zhang, Xiaotao; Apsley, Judith; Jordan, Steven

doi:10.1049/joe.2018.8207

Cited by 2 publications

(4 citation statements)

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“…where K p (v) is the pitch factor, K b (v) is the stator slot opening factor, K d (v) is the distribution factor, K a (v) is a factor relating to the double-layer winding layout, and N ph is the number of turns per phase group, computed from the geometric parameters in Table A1, following [35,36]. Rotor angle is related to the stator angle by the physical rotor angle θ m , and pole pairs, ρ. Rotor field and damper windings can be written in terms of stator angle, using a change of variables…”

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

“…The magnetic flux density due to winding w 1 , with current i w1 (t) can be found by integration [36], as per Equation (A6), where ζ ¼ l for a stator winding and ζ ¼ l þ ν for a rotor winding. Saturation factor k will be discussed later.…”

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

“…The inverse airgap variation, g À 1 , can also be represented as a harmonic series [36]. Due to rotor saliency, it depends on the rotor angle and by symmetry, only even harmonics are non-zero.…”

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

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Diode rectifier configurations with a multiphase synchronous generator

Zhang

Apsley

2020

IET Electric Power Appl

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Direct current (DC) power networks are widely used in transport applications, often derived from a synchronous generator and diode rectifier. The use of more than three phases to reduce the DC voltage ripple eliminates the DC filter capacitance and incorporating multiple phases into the generator avoids the need for bulky phase‐shifting transformers. Recent trends have moved away from high phase‐number machines to multiple winding sets, in order to enhance fault tolerance. This study shows how the number and arrangement of these phase sets and rectifier circuits should be selected to improve steady‐state performance, by suppressing unwanted harmonics. Complex harmonic analysis expressions are developed for the wound field, salient, synchronous generator incorporating both saliency and saturation, allowing general design principles for avoiding circulating harmonic currents and high peak diode currents to be identified. The model is validated on a 15‐phase, 19kVA laboratory machine, reconfigurable as five 3‐phase sets and three 5‐phase sets. The results show that for this example, multiple 3‐phase, winding sets can give better performance than the high phase‐number system, with lower stator copper loss and higher power factor.

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Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

Section: Appendix A-generator Data Appendix B-cha Generator Modelmentioning

confidence: 99%

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