The Department of Electrical and Electronics Engineering is glad to announce that Dr Ramanjaneya Reddy, Assistant Professor; his students, Mr Rahul Kotana and Ms SK Hima Bindu have published a paper titled “High Gain Boost Converter Fed Single-Phase Sine Pulse Width Modulated Inverter” in the journal ‘International Journal of Renewable Energy Research’ having a Scopus site score of 4.2.
Abstract of the Research
A high gain boost converter fed single-phase voltage source inverter with its control for DC to AC power conversion in uninterrupted power supply and renewable energy applications is presented in this paper. The conventional DC-DC boost converter with a coupled inductor and switched capacitor is utilised to obtain high gain. Further, the output voltage of the inverter is controlled by the sinusoidal pulse width modulation technique. The detailed design and analysis of a high gain boost converter fed single-phase voltage source inverter is presented. The sine pulse width modulation control scheme for the voltage source inverter is also developed and presented. To validate the high gain boost converter fed single-phase voltage source inverter, the simulation model is developed in the LTspice software environment, and the results are validated. The results show high gain boost converter achieves a gain of about 10 and the single-phase voltage source inverter can provide an rms voltage of 228 V without using the step-up transformer. The total harmonic distortion of output current is found to be below 4.
About the Research
Energy is an essential factor for the functioning and economic development of the industrialized world. It plays a key role in our day-to-day life. On the other hand, energy management has become a critical factor for our successive economic prosperity. The energy consumption process frequently needs either DC-AC conversion or AC-DC conversion. The DC-AC conversion finds its major application in uninterrupted power supply (UPS) and renewable energy (RE). To supply during power outages, most UPS systems use batteries, usually lead-acid, as the storage mechanism. The battery is supposed to provide the backup in the absence of the grid supply. However, the voltage provided by the battery alone may not be enough to provide the backup. At first, the battery output power which is DC needs to be converted to AC with the help of an inverter. Apparently, the output of the inverter needs to be stepped up with the help of a step-up transformer to achieve an output of 220V 50Hz. An alternative approach to the same process is by using a power electronic converter called the DC-DC boost converter. The boosting of battery/PV voltage can be achieved with the help of a standard boost converter as shown in Fig. 1(b), or by using a battery capable of supplying higher voltage and a step-up transformer as shown in Fig. 1(a). High power batteries and step-up transformers can be eliminated if a high gain boost (HGB) converter is used instead of a standard boost converter. The HGB converter fed DC-AC conversion system is presented in this paper which eliminates the step-up transformer. The circuit configuration of the proposed work is depicted in Fig. 2.
Practical Implementations of the Research
The DC-AC conversion method proposed is based on the HGB converter fed single-phase SPWM inverter. The proposed model is best suited when a low voltage DC supply is available, and a standard 230V AC output is needed to deliver the load. The detailed design and analysis of the HGB converter are carried out, and the gain of the converter is achieved at around 10, which is very high compared with conventional boost converter topologies. A unipolar SPWM control scheme is developed in LTspice to control the single-phase VSI. The simulation results of the complete DC-AC conversion system are in close agreement with the design parameters. Further, the total harmonic distortion of the output current waveform is around 4% which is well below the international standards. In addition, the complete model consisting of both HGB converter and single-phase VSI are successfully simulated for an input of 36 V DC and produced an rms output voltage of 228 V.
In future, the DC-AC conversion method based on a high gain boost converter can be extended with the three-phase voltage source inverter with electric drive applications.
