Implementation of Closed Loop System For Flying Capacitor Multilevel Inverter With Stand-Alone Photovoltaic Input

摘要

This paper focuses on the development of closed loop system for seven level flying capacitor multilevel inverter (FCMLI). In our present system, in most of the cases only simple inverters such as full bridge and half bridge configurations are used. Inverters are often used to provide power to electronics in the case of a power outage or for activities such as camping, where no power is available. An inverter converts a DC or battery power into an AC or household power. But the main drawbacks of these inverters are high harmonic content and used only for limited power applications. This is the main problem identified in our existing system, in order to overcome this problem a new topology of FCMLI will be presented, which significantly increases the level number of the output waveform and thereby dramatically reduces the low-order harmonics and THD. The proposed system consists of a DC-DC power converter and a DC-AC multilevel inverter. In order to achieve low cost, easy control, high efficiency, and high reliability, a capacitor clamped DC-DC boost converter using minimal devices is introduced to interface the low-voltage Photovoltaic (PV) module. In this paper, a phase disposition - pulse width modulation (PD-PWM) technique, applicable for proposed FCMLI is presented. With the use of multilevel inverter, resolution is increased and also the harmonics is highly reduced. The proposed seven level flying capacitor multilevel inverter not only achieves high power ratings, but also enables the use of renewable energy sources in an efficient manner. In order to justify the merits of the proposed system, it is interfaced with the single phase lamp load and analysed through simulation investigations.