Load frequency control existing in restructured power system retains frequency change and transmission line power variations within limits. Tie line bias control strategy adopted for load frequency control allows only contracted power to flow through transmission line. Thus, during violation, this strategy does not allow transmission companies to utilize its available reserve beyond the contract. Concurrently, only same area generation units are rescheduled to satisfy violations. This paper proposes a new control strategy for load frequency control in a competitive environment considering transmission line reserve. The strategy allows the use of more economic generating units located in neighbouring areas, thereby making use of transmission company’s reserve up to the maximum limit during violation. The proposed strategy is tested for its effective and efficient performance under bilateral and poolco model with various contract violations. The strategy proves for the effective utilization of neighbouring generating units that offers lowest prices thereby making the system efficient.
Comparison of Various Load Frequency Control Schemes in Restructured Power System Environment
