Closed Loop Control of PV High Voltage Gain Dc-Dc Converter with Two Input Boost Stages

Abstract

DC-DC converter is a device which produces a dc output voltage when a dc input is given. If output voltage needed is higher than input voltage we go for boost converter. The conventional boost converter can be used for step up applications because of low conduction loss, simple structure and low cost. However, it is not suitable for high step-up applications. Generally conventional boost converters have been used to obtain higher output voltage than the input voltage. When these boost converters are operated for high ratios it leads to high voltage and current stress on the switch. Hence an interleaving technique of boost converter has been presented. This method of approach can be used in high power applications to produce high voltage gain when compared to the conventional boost converter. A simple dc-dc boost converter is unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductor and capacitors. In this paper proposes new dc-dc converter to achieve high voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch –on period and are discharged in series during the switch-off period. In this converter mainly proposed converter. That is used for PV system. To achieve high-voltage conversion ratios, a new family of high-voltage-gain dc–dc power electronic converters has been introduced. The proposed converter can be used to draw power from two independent dc sources as a multiport converter or one source in an interleaved manner. They draw continuous input current from both the input sources with low current ripple which is required in many applications, e.g., solar. Several diode-capacitor stages are cascaded together to boost up the voltage which limits the voltage stresses on the switches, diodes, and capacitors. In extension the input DC source is replaced with PV system and closed loop control is used to maintain output current is constant