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This paper describes the Load Frequency Control (LFC) of two area interconnected reheat thermal system using conventional Proportional -Integral (PI) controller. The system is incorporated with governor dead band, generation rate constraint non-linearity and boiler dynamics. The conventional PID & P controllers do not yield adequate control performance with the consideration of nonlinearities and boiler dynamics. To overcome this drawback PI Controller has been employed in the system. The aim of PI is to restore the frequency and tie line power in very smooth way to its nominal value in the shortest possible time. Time domain simulations are used to study the performance of the power system. System performance is examined considering 1% step load perturbation in either area of the system.

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Multilevel inverters proved its capabilities nowadays operating in the symmetrical and asymmetrical source of voltages to bring output voltage nearly to a sinusoid. Several variations in topological strategies put forth better output quality with lesser harmonic distortion. However, it suffers from several issues predominantly such as more number of devices, higher blocking voltage, and power loss for higher voltage levels. This paper forays a fresh topology on switched configuration multilevel inverters with optimum dc sources, switches, voltage level, and filter requirements. The proposed topology has the flexibility to extend for higher voltage levels with make use of less switches. The proposed structure has been simulated in MATLAB/Simulink and validated the results in a laboratory setup.

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