Closed Loop Simulation of an Active Buck- Boost Inverter

Renewable energy resources are gaining popularity now a days. Their input varies with changes in climatic conditions. So the output from them is not a constant value. The output of the energy sources have to be connected to grid. But the grid voltage is always constant. So the output from the renewable energy converters have to be constant. But the input of the renewable energy converters always varies with climatic and weather conditions. So the output of the converters also changes. To get a constant output voltage at the grid some power converters have to be connected in between the renewable energy converters and the grid. These converters maintain constant output voltage at constant frequency irrespective of changes in input voltage. This paper introduces the concept of an Active BuckBoost Inverter (ABI). In this converter the passive elements from the conventional buck-boost converter is eliminated. Closed loop simulation of the proposed converter is done to show that the output voltage of the converter remains the same even if the input voltage changes.