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This article presents a dual-input impedance network derived three-phase three-level (3P3L) Z-source inverter (ZSI)–based inverter to transfer the power generated on the photovoltaic (PV) system to grid. The PV power generation system has become a most popular renewable power generation system because of the abundant availability of solar energy and the growth of the modern power electronics converters. The ZSI provides single-stage power conversion for dc–ac conversion with a regulated voltage at the output. The proposed inverter is constructed with an Inductor-Capacitor-Capacitor-Transformer (LCCT)-derived impedance network to extend the voltage boosting gain and efficiency with small duty ratio. The boosting gain, efficiency, and power transfer capability of the proposed topology are demonstrated by several case studies. The experimental results of the proposed 3P3L-ZSI–based inverter with dual-input voltage source are presented to validate the simulated results.

This paper proposes an efficient speed control and power factor improvement of three phase induction motor using PLC. Hardware and software are implemented in this work. The hardware consists of power-circuit and control-circuit of the working system and software PLC programs were developed. Power factor correction is applied to enhance the efficiency of transmission network. Three phase induction motor is used which acts as inductive load which produce variation in power factor. The power factor of the supply line is directly monitored by the Multi-Function Meter which is connected in parallel to the supply line. The value of the capacitance (capacitor bank) for correcting the power factor variation due to induction motor is found out separately. Capacitor bank for the respective load is triggered by using PLC, which connects the capacitor bank parallel to the load and thereby bringing the power factor nearly to unity. The speed of the motor can also be varied from minimum value to the rated value by VF method. The results obtained prove that the power factor can be improved automatically and also accurate speed control can be obtained.

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