Journal of Electrical Engineering and Technology

The Korean Institute of Electrical Engineers (대한전기학회)
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Modelling and Stability Analysis of AC-DC Power Systems Feeding a Speed Controlled DC Motor

  • Pakdeeto, Jakkrit (Power electronics, Energy, Machines and Control Research Group, School of Electrical Engineering, Suranaree University of Technology) ;
  • Areerak, Kongpan (Power electronics, Energy, Machines and Control Research Group, School of Electrical Engineering, Suranaree University of Technology) ;
  • Areerak, Kongpol (Power electronics, Energy, Machines and Control Research Group, School of Electrical Engineering, Suranaree University of Technology)
  • Received : 2017.07.04
  • Accepted : 2018.02.26
  • Published : 2018.07.01
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Abstract

This paper presents a stability analysis of AC-DC power system feeding a speed controlled DC motor in which this load behaves as a constant power load (CPL). A CPL can significantly degrade power system stability margin. Hence, the stability analysis is very important. The DQ and generalized state-space averaging methods are used to derive the mathematical model suitable for stability issues. The paper analyzes the stability of power systems for both speed control natural frequency and DC-link parameter variations and takes into account controlled speed motor dynamics. However, accurate DC-link filter and DC motor parameters are very important for the stability study of practical systems. According to the measurement errors and a large variation in a DC-link capacitor value, the system identification is needed to provide the accurate parameters. Therefore, the paper also presents the identification of system parameters using the adaptive Tabu search technique. The stability margins can be then predicted via the eigenvalue theorem with the resulting dynamic model. The intensive time-domain simulations and experimental results are used to support the theoretical results.

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References

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