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R.Durga R.Durga
K.Selvi K.Selvi
M.Bhavani M.Bhavani


After the emergence of deregulated electricity market, electricity is priced based on the demand and the generations existing at that instant of time. Even though the transition of existing vertically integrated power system into deregulated power environment improves the efficiency of the power system, the unexpected rapid load changes and outage of generating units lead to drastic frequency fluctuations. Hence it requires proper ancillary services to serve the system load. Load Frequency Control (LFC) is an ancillary service needed to maintain the system frequency under dynamic conditions. This paper presents a novel price based LFC for a two area system based on Unscheduled Interchange (UI) price signal. The analysis of system response improvement is carried out with Particle Swarm Optimization (PSO) tuned Thyristor Controlled Phase Shifter (TCPS). This work is applied in deregulated environment by employing DISCO (Distribution Company) participation matrix (DPM). The optimal values of the gain and time constant parameters of TCPS are obtained using PSO. The robustness of the proposed method is checked for a two area system with four Generation Companies (GENCOs) and one Distribution Company (DISCO) each .It is found that, the proposed approach gives promising results in damping out the system oscillations with reduced unscheduled interchange between the areas.

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