Partial shading causes mismatch losses in the solar PV system. In the PV array, the power output from the healthy PV modules is gone in vain due to the mismatch losses. The PV array construction with the high resistivity to the mismatch loss generation is the progressing research work in the research field. In this work, a new kind of array configuration scheme is framed for the PV system for overcoming the effect of partial shading. The proposed array configuration has a high resistivity to the mismatch loss generation over the other conventional array configuration methods. The array configuration is framed in a pattern that is similar to the spiral step pattern. Each row of the PV array is constructed with the PV modules from each row of the conventional Total Cross Tied configuration with the optimized distance. This row construction allows the system to uniformly disperses the partial shading over the PV array. The simulation analysis is carried out by applying various shading patterns in MATLAB/Simulink®. The performance of the proposed array configuration is also analyzed in the experimental setup and the results were presented.

The increased level of penetration of wind generators into modern power system has significant effect on network operation. The time varying nature of wind speed has significant effect on performance of wind generator, therefore efficient mechanism for stabilizing the output of the wind generator is very much needed. Self-excited induction generators (SEIG) already existing in the network are sensitive to wind speeds. In this paper, a new method for voltage control of SEIG utilizing reactive power enhancing capabilities of doubly-fed induction generator (DFIG) is simulated and its effect on the network is analyzed for varying wind speeds. The choice of placing DFIG adjacent to SEIG or at another bus is also addressed in this paper with simulation results. The results show that this method of utilizing the reactive power capabilities of DFIG enhances voltage stability of SEIG as well as system stability.

This paper proposes the modulation scheme for grid connected full bridge inverter of single phase configuration to achieve ZVS condition with auxiliary switch. The THI PWM strategy is employed to control the auxiliary switch which is evolved from ZVS THI PWM, the DF modulation scheme is incorporated to generate auxiliary switching pulse. The ZVS THI PWM scheme is employed simultaneously on grid connected full bridge inverter and its performance is observed. The ZVS condition of inverter switches is also achieved by short circuit pulses generated from auxiliary switching pulses. The proposed control scheme with THI PWM and DF modulation scheme is modeled, the performance of full-bridge inverter of single phase configuration with control scheme is analyzed using MATLAB. The results depict that the proposed converter control scheme exhibits better performance compared to DF SPWM.

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