Mr. Mustafeezul Hassan

A Multi-Input boost Converter (MIC) based inverter with grid-tie capability is proposed to obtain power from three sources and to supply the regulated output voltage to the load from the sources. The system consists of three-input DC-DC boost converter and inverter. The grid-tie capability allows this system to be used both in grid tie and islanded operational mode. Furthermore, there is also axillary DC output form the boost convertor for DC loads. The structure of MIC is simpler compared to the use of several single-input converters for each source. As the conventional source of energy is rapidly depleting and the cost of energy is rising, and there is a need to turn towards renewable energy sources like Photo Voltaic (PV) source and wind source. Since, the power from these sources is intermittent, a storage element is used to provide uninterrupted supply to the load. The converter topology enables the charging and discharging of the storage element through input power sources. The technique also reduces the system size and cost by reducing the number of components and operating at higher frequency. This improves overall dynamic response and reliability. Moreover, the inverter is based on multilevel capacitor clamped topology. The modulation technique is Sinusoidal Pulse Width Modulation (SPWM) whose frequency is variable so it can operate as a variable frequency drive or synchronize with the grid using Phase-Locked Loop (PLL). The output of the inverter is followed by a LCL filter to suppress the harmonics and to lower Total Harmonic Distortion (THD) level. The closed loop operation of converter and inverter is achieved using microcontroller.

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