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The Korean Institute of Electrical Engineers (대한전기학회)
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Performance Improvement for PID Controllers by using Dual-Input Describing Function (DIDF) Method

DIDF를 이용한 PID제어기의 성능향상에 관한 연구

  • 최연욱 (부경대학교 제어계측공학과)
  • Received : 2011.04.28
  • Accepted : 2011.08.17
  • Published : 2011.09.01
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Abstract

Though various techniques have been studied as a way of adjusting parameters of PID controllers, no perfect method of determining parameters is available to date. This paper proposes a new method for enhancing performance of PID controllers by using the characteristics of dual-input describing function (DIDF). In other words, if nonlinear elements with two inputs (DIDF) are connected in series to the plant, the critical point (-1+j0) for Nyquist stability theory can be moved to a position arbitrarily selected on the complex plane by determining necessary coefficients of the DIDF appropriately. This makes the application of the existing conventional PID parameter tuning methods a lot easier, and stability and robustness of the system are improved simultaneously due to the DIDF inserted.

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References

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