Analysis of SBI (Switched Boost Inverter) Based On Nano Grid Applications Using PWM Technique
english

M. Sailaja, K.Daya kar
2014 International Journal of Innovative Research in Science Engineering and Technology  
In order to supply power from a solar panel or photo voltaic system at a low voltage to a grid at high voltage, a power electronic converter which is capable of voltage boosting and inversion is required. Newly introduced Switched Boost Inverter is capable of achieving both these objectives by a single stage. This paper presents a PWM control strategy based switched Boost Inverter (SBI) for DC nanogrid applications. Using Switched boost inverter (SBI), the system can produce an ac output
more » ... an ac output voltage which is either greater or less than that of the dc input voltage. This also exhibits better Electro Magnetic Interference (EMI) noise immunity as compared to the VSI, which enables compact design of the power converter. It allows the shoot through switching state for boosting the input voltage and, compensates the dead time effect which causes the serious output voltage waveform distortion and avoids the risk of damaging the inverter switches. It can supply both ac and dc loads simultaneously from a single dc input source. These features cannot be obtained in the traditional inverters and they are more advantageous for DC nanogrid applications. The whole system is designed, modeled and, simulated in a MATLAB software. IV. PWM CONTROL OF SBI The PWM control of SBI is based on traditional sine-triangle PWM with unipolar voltage switching. This control technique has been illustrated in below fig.6 , during positive and negative half cycles of sinusoidal modulating signal, which is shown in fig.6 (a) . Fig. 6. (a) Sinusoidal Modulation Signals (b) Schematic of the PWM control circuit when vm (t) > 0. (c) Schematic of the PWM control circuit when vm (t) < 0. As shown in fig 7, simulation of the proposed model is performed using MATLAB. Fig.7. Simulation Diagram of the Proposed closed loop SBI based DC nanogrid Pulse width modulation is used to reduce the harmonics and improve the efficiency. The simulation results are shown in fig 7. The input dc voltage from the PV cell and the gating signals of five switches of SBI is shown in fig 8(a) and 8(b) respectively. Also the AC and DC output load voltages are shown in fig 8(c) and 8(d) respectively. The output voltage is boosted as compared with the input DC, with the help of the switched Boost Inverter configuration. (a) VI. CONCLUSION Switched boost inverter (SBI) can produce an ac output voltage which is either greater or less than that of the dc input voltage. This also exhibits better Electro Magnetic Interference (EMI) noise immunity as compared to the VSI, which enables compact design of the power converter. It allows the shoot through switching state for boosting the input voltage and, compensates the dead time effect which causes the serious output voltage waveform distortion and avoids the risk of damaging the inverter switches. Therefore this circuit eliminates dead time circuit and complex dead time compensation technologies and thereby reduces the size and cost as compared to two stage DC to AC conversion system. It can supply both ac and dc loads simultaneously from a single dc input source. These features cannot be obtained in the traditional inverters and they are more advantageous for DC nanogrid applications.
doi:10.15680/ijirset.2014.0311012 fatcat:u2gpnaeqzvesffmbem3gnlpheu