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By S. Selvaperumal, R. Nagarajan, P. Nedumal Pugazhenthi

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Based on the switching operation getting output DC voltage. Normally output voltage based on the triggering and commutation time period. Diodes D7 and D8 are connected in this circuit this is help to smooth operation of switches. Figure1 PI filter is connected to the output side of second converter up to second converter so less ripple output DC voltage is move to the load side. Finally converter circuit with PI filter is implemented in hardware. 33 Voltage (v) Applied Mechanics and Materials Vol.

Fig. 5 (a) Voltage waveform for SEPIC converter under normal Condition. Fig. 5 (b) Voltage waveform for SEPIC converter under partial shading Condition. 30 Advancements in Automation and Control Technologies Fig. 5a, shows the voltage waveform for P&O technique based SEPIC converter. P&O technique tracks the first peak as global peak and corresponding power delivered to the load. So, the PV power cannot be used effectively. Fig. 5b, demonstrates Voltage waveform for DPSO based SEPIC converter. In partial shading condition DPSO technique is used to track the MPP effectively compared to PSO technique.

We obtained a variable speed by varying the duty cycle of the chopper that is provided by the gating signals from the PI controller, and thus controlling the speed of the DC Motor by varying the voltage supplied from the DC drive to the armature of the motor. Also the performance of the proposed system is investigated by using different controller tuning methods verifying the time domain and performance indices. U. Ogbuka, Performance characteristics of Controlled separately excited dc motor, PacificJournal of Science and Technology, 10(1), 67-74.

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