Effects of Unscheduled Interchange based secondary frequency control on tie line power of multi-area hybrid power system

The significance of interconnected power system is growing day-by-day as many a times the availability resources for electric power generation depends on geographical locations and is distributed in nature. At the same time the strengths of demands are not uniform in a country like India. Hence to mitigate the gap between power generation and demand, especially in a country like India, interconnected power systems are the best choice. Again the economy of power generation should be optimized by keeping the interest of buyers and sellers of power at satisfactory level. In this regard Unscheduled Interchange (UI) price based load frequency control has been adopted here to study the tie line power fluctuations of an interconnected power system. A four area power system having generations from thermal power, hydro power and diesel/biomass power has been considered for load frequency control. This system is simulated first for sudden load changes in all areas. In next case, the tie line power variations due to disconnections of all tie lines of a particular area with others are studied.