Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Algorithm for Reducing the Effect of Network Delay of Sensor Data in Network-Based AC Motor Drives

  • Chun, Tae-Won (Dept. of Electrical Eng., University of Ulsan) ;
  • Ahn, Jung-Ryol (Dept. of Electrical and Electronics Eng., Donghee Industrial Co. Ltd.) ;
  • Lee, Hong-Hee (Dept. of Electrical Eng., University of Ulsan) ;
  • Kim, Heung-Geun (Dept. of Electrical Eng., Kyungpook National University) ;
  • Nho, Eui-Cheol (Dept. of Electrical Eng., Pukyong National University)
  • Received : 2010.08.02
  • Published : 2011.05.20
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Abstract

Network-based controls for ac motor drive systems are becoming increasingly important. In this paper, an ac motor control system is implemented by a motor control module and three sensor modules such as a voltage sensor module, a current sensor module, and an encoder module. There will inevitably be network time delays from the sensor modules to the motor control system, which often degrades and even destabilizes the motor drive system. As a result, it becomes very difficult to estimate the network delayed ac sensor data. An algorithm to reduce the effects of network time delays on sensor data is proposed, using both a synchronization signal and a simple method for estimating the sensor data. The algorithm is applied to a vector controlled induction motor drive system, and the performance of the proposed algorithm is verified with experiments.

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References

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