Preprint Article Version 1 This version is not peer-reviewed

A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems

Version 1 : Received: 7 October 2018 / Approved: 8 October 2018 / Online: 8 October 2018 (12:43:20 CEST)

A peer-reviewed article of this Preprint also exists.

Khalil, A.; Swee Peng, A. A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems. Energies 2018, 11, 3460. Khalil, A.; Swee Peng, A. A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems. Energies 2018, 11, 3460.

Journal reference: Energies 2018, 11, 3460
DOI: 10.3390/en11123460

Abstract

The open communication is an exigent need for future power system where the time delay is unavoidable. In order to secure the stability of the grid, the frequency must remain within its limited range which is achieved through the load frequency control. The load frequency control signals are transmitted through communication networks which induces time delay that could destabilize the power systems. So, in order to guarantee the stability the delay margin should be computed. In this paper, we present a new method for calculating the delay margin in load frequency control systems. The transcendental time delay characteristics equation is transformed to frequency dependant equation. The spectral radius is used to find the frequencies at which the roots crosses the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A one-area load frequency control system is chosen as case study. The effectiveness of the proposed method has been proved through comparing with the most recent published methods. The method shows its merit with less conservativeness and less computations. The PI controller gains are preferable to be chosen large to reduce the damping, however, the delay margin decreases with increasing the PI controller gains.

Subject Areas

communication time delays; delay margin; delay dependent stability; load frequency control system; sweeping test

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