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Current-fed soft-switching push-pull front-end converter based bidirectional inverter for residential photovoltaic power system

Category : Power System


Sub Category :


Project Code : ITPS06


Project Abstract

Photovoltaic (PV) residential power system is an important application of renewable energy. The parallel-connected configuration of PV modules rather than the series-connected configuration become popular considering the safety requirements and making full use of the PV generated power for the PV residential generation system. In this paper, a novel soft-switching current-fed push-pull front-end converter based inverter is proposed. Push-pull converter has only two primary devices with common ground to supply and results in simple and reduced gating requirement. The device voltage is clamped naturally by secondary modulation without active clamping circuit or passive snubbers. Zero-current switching (ZCS) of primary devices and zero-voltage switching (ZVS) of secondary devices is achieved. Soft-switching is inherent owing to proposed secondary modulation, load independent, and is maintained during wide variation of input voltage and power transfer capacity, and thus is suitable for PV applications. The hardware design is implemented by PIC16F877A controller circuit.

EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT:

      Design of a high step-up front-end dc/dc converter is critical to convert wide input voltage range into regulated higher dc voltage with high efficiency.

 Non-isolated high step-up dc/dc converters in PV grid-connected application have been reviewed

PROPOSED CONCEPT:

 High frequency (HF) transformer isolated dc/dc converter is preferred to obtain high step-up ratio and the galvanic isolation between the PV modules and the utility.

 For voltage-fed topologies, considerably large electrolytic capacitor is generally required to suppress the large input current ripple, resulting large size, high cost and shortened lifetime of PV system.

EXSISTING TECHNIQUE:

      hard-switching

 

PROPOSED TECHNIQUE:

      zero-voltage switching (ZVS) or zero-current switching (ZCS)

TECHNIQUE EXPLANATION:       Have been proposed and analyzed for solar inverter applications. Parasitic effect of devices and reverse recovery issue of diodes are the main issues and constraints for those converters with low efficiency and voltage gain

TECHNIQUE EXPLANATION:

      In this project, a dual stage dc/ac inverter proposed that is composed of high step-up snubberless current-fed push-pull front-end converter and standard full-bridge inverter.

DRAWBACKS :

·         Control scheme is complicated.

·         Hard switching.

·         Losses are high.

·         Circuit complicity is high.

·     Coupled inductor turns ratios hi high.

ADVANTAGES :

         Smaller input current ripple.

          Lower transformer turns-ratio

         Capacitive output filter

         No flux-imbalance problem.

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