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Nowadays, the use of renewable energy and green sources is gaining attention. Photovoltaic (PV) systems and fuel cell (FC) are new source of energy that generates dc voltage [1], [2]. The dc/ac inverters are power electronic devices used to produce mains voltage ac power from voltage dc sources (battery, PV or FC)[3]. For the energy conversion, the typical converter is based on a multi-stage converter and specially two-stage converter. Two-stage configuration is mainly used because of its advantages of easy control since maximum power point tracking (MMPT) control and current injection control [3], [4]. For example in the PV system the first stage is a dc/dc boost type converter responsible for both extracting the MPPT and boosting the PV voltage to a value higher than the peak of the grid voltage. The second stage is a dc/ac inverter that generates a current to be either injected into the grid or to feed loads. The last few years, however, have witnessed the introduction of novel technologies and concepts [5]. Power exchange between grid and renewable energies is one advantage of smart grid. In this paper, a multi-stage micro-grid inverter topology is proposed based on new transformer less high gain dc/dc converter and nine switch inverter. The proposed dc/dc converter has the advantage of high-voltage gain and uses partial power processing technique. In the dc/ac part of multi-stage converter, nine-switch inverter is used [6]-[9]. The structure of the nine-switch inverter is presented in Fig. 1.

Power Exchange by Using Micro-grid Inverter with High-Voltage Gain for Photovoltaic Applications