Details
| Original language | English |
|---|---|
| Article number | 8367894 |
| Pages (from-to) | 4315-4323 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Industry Applications |
| Volume | 54 |
| Issue number | 5 |
| Publication status | Published - 1 Sept 2018 |
Abstract
This paper offers methods to analyze the performance of three-phase synchronous machines operating with an unsymmetrical stator winding caused by cutting out and bypassing coils. The resulting unsymmetrical current distribution in the stator winding tends to produce overheating in parts of the stator and damper windings at full load as well as torque pulsations. Thus, the main objective of this study is to determine the maximal load, under which the unsymmetrical machine may operate without exceeding the permissible temperature limit. Based on the multiloop method, a mathematical model of a synchronous machine with missing coils in the stator winding is developed. In order to determine the current distribution, the machines' system of differential equations is solved by using a numerical integration method (Runge-Kutta method). As an alternative method, the system of differential equations in the steady state is reduced to a system of algebraic equations, which can be solved with the Gaussian elimination method. Both methods are validated by the measurement results of a 25-kW salient pole synchronous machine. Furthermore, both the circulating current within the parallel branches and the line currents of the different phases as a result of coil or coil group cut-outs are analyzed for a large 41-MW cylindrical rotor synchronous motor.
Keywords
- Bypassed coils, circulating current, cut-out coils, multiloop method, synchronous machine, unsymmetrical winding, winding fault
ASJC Scopus subject areas
- Engineering(all)
- Control and Systems Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Transactions on Industry Applications, Vol. 54, No. 5, 8367894, 01.09.2018, p. 4315-4323.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Performance Analysis of Synchronous Machines after Disconnecting Stator Coils
AU - Misir, Onur
AU - Raziee, Seyed Morteza
AU - Spyridonidis, Ioannis
AU - Brand, Jennifer
AU - Bothmann, Fabian
AU - Dreyer, Malte
AU - Ponick, Bernd
N1 - Publisher Copyright: © 1972-2012 IEEE. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/9/1
Y1 - 2018/9/1
N2 - This paper offers methods to analyze the performance of three-phase synchronous machines operating with an unsymmetrical stator winding caused by cutting out and bypassing coils. The resulting unsymmetrical current distribution in the stator winding tends to produce overheating in parts of the stator and damper windings at full load as well as torque pulsations. Thus, the main objective of this study is to determine the maximal load, under which the unsymmetrical machine may operate without exceeding the permissible temperature limit. Based on the multiloop method, a mathematical model of a synchronous machine with missing coils in the stator winding is developed. In order to determine the current distribution, the machines' system of differential equations is solved by using a numerical integration method (Runge-Kutta method). As an alternative method, the system of differential equations in the steady state is reduced to a system of algebraic equations, which can be solved with the Gaussian elimination method. Both methods are validated by the measurement results of a 25-kW salient pole synchronous machine. Furthermore, both the circulating current within the parallel branches and the line currents of the different phases as a result of coil or coil group cut-outs are analyzed for a large 41-MW cylindrical rotor synchronous motor.
AB - This paper offers methods to analyze the performance of three-phase synchronous machines operating with an unsymmetrical stator winding caused by cutting out and bypassing coils. The resulting unsymmetrical current distribution in the stator winding tends to produce overheating in parts of the stator and damper windings at full load as well as torque pulsations. Thus, the main objective of this study is to determine the maximal load, under which the unsymmetrical machine may operate without exceeding the permissible temperature limit. Based on the multiloop method, a mathematical model of a synchronous machine with missing coils in the stator winding is developed. In order to determine the current distribution, the machines' system of differential equations is solved by using a numerical integration method (Runge-Kutta method). As an alternative method, the system of differential equations in the steady state is reduced to a system of algebraic equations, which can be solved with the Gaussian elimination method. Both methods are validated by the measurement results of a 25-kW salient pole synchronous machine. Furthermore, both the circulating current within the parallel branches and the line currents of the different phases as a result of coil or coil group cut-outs are analyzed for a large 41-MW cylindrical rotor synchronous motor.
KW - Bypassed coils
KW - circulating current
KW - cut-out coils
KW - multiloop method
KW - synchronous machine
KW - unsymmetrical winding
KW - winding fault
UR - http://www.scopus.com/inward/record.url?scp=85047652472&partnerID=8YFLogxK
U2 - 10.1109/tia.2018.2840972
DO - 10.1109/tia.2018.2840972
M3 - Article
AN - SCOPUS:85047652472
VL - 54
SP - 4315
EP - 4323
JO - IEEE Transactions on Industry Applications
JF - IEEE Transactions on Industry Applications
SN - 0093-9994
IS - 5
M1 - 8367894
ER -