High Step up Dc-Dc Converter For Distributed Power Generation

This paper presents, a high voltage gain DC-DC converter for distributed generation (DG) systems with MPPT controller. A high step-up ratio and clamp- mode converter are proposed to achieve high voltage gain and high efficiency. This can be obtained by using two capacitors and one coupled inductor. During the switch-off period, the capacitors are charged in parallel and during the switch-on period they are discharged in series by the energy stored in the coupled inductor. A passive clamp circuit is used to recycle the leakage inductor energy of the coupled inductor, thus voltage stress on the main switch is reduced. The control method for the circuit is implemented using a MPPT controller which tracks the maximum power of the sources. The converter is suitable for high power applications because of the reduced conduction loss and low input current ripple. The operating principle and MATLAB simulations are discussed in detail.

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