AGC study of a hydrothermal system with SMES and TCPS

Frequency deviations and inter-area tie-power fluctuations from their respective scheduled values following a local load disturbance are a source of great concern in interconnected power system operation and control. In this paper, a new method is proposed to minimise such deviations and thereby enhance the performance of Automatic Generation Control (AGC) of an interconnected hydrothermal power system with the coordinated operation of a Superconducting Magnetic Energy Storage (SMES) unit in thermal area and a Thyristor Controlled Phase Shifter (TCPS) in series with the tie-line. Generation Rate Constraints (GRCs) are also considered for the thermal and hydro systems. The integral controller gain settings are obtained by optimising a quadratic performance index using the Integral Squared Error technique. Comparison of the dynamic responses demonstrates the effectiveness and efficiency of the suggested SMES–TCPS combination in suppressing and stabilising the oscillations of frequency and tie-power deviations as well as in reducing the settling time. Copyright © 2008 John Wiley & Sons, Ltd.

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