In an H-Bridge conventional convert

In an H-Bridge conventional converter the neutral leg capacitor is removed and the switches in the two legs are operated by a single controller in a complementary manner. In this work, a sliding mode based controller was developed for an H-Bridge inverter and experimental results were obtained to support the theoretical analysis and estimations. The controller is similar to the conversion leg controller of the neutral leg topology with a different steady state control input. The topology of the H-Bridge inverter is shown in Figure 2.3. The objective of this controller is as following,• The controller uses a preset RMS value to generate error function by comparing it with the feedback of the RMS value of the output voltage and uses an internal sinusoidal reference to create the reference current which is then tracked by the sliding mode controller.• The resulting reference current is followed by the sliding mode controller in such a manner that there are no phase differences in the resulting output. Due to the non-linear nature of the controller it is easily able to follow the sinusoidal reference current to ensure unity power factor. For a grid connected inverter, an STA can easily be used instead of the internal sinusoidal reference to synchronize the inverter to the grid and connect it to the existing power system. A filter is still used in this controller to sense and remove any DC bias or disturbances in the output voltage.