1. DOUBLE INPUT Z-SOURCE DC-DC CONVERTER

2. ABSTRACT
In this project presents a dynamic voltage restorer (DVR) that is characterized by the use of a high-frequency unidirectional isolated dc–dc converter is proposed. A traditional DVR has a large and bulky series transformer even for three-phase low-voltage up to 480-V applications because the transformer operates at the line frequency. This project discusses the control and performance of a low-voltage DVR using a high-frequency isolated dc–dc converter. The high-frequency transformer in the dc–dc converter is much smaller. Experimental results obtained from the prototype confirm the viability and effectiveness of the system configuration.

3. EXISTING SYSTEM LIMITS
two dc voltage sources are connected to two independent dc-dc power converters to obtain two stable and equivalent output voltages, which are then connected to the dc bus, to provide the electric energy demanded by the load. Another approach for the double-input dc-dc converter is to put two dc sources in series to form a single voltage source where traditional dc-dc power converters can be used to transfer power to the load. In order to transfer power individually, each dc voltage source needs a controllable switch to provide a bypass short circuit for the input current of the other dc voltage source to deliver electric energy

4. PROPOSED SYSTEM MERITS
Z-source converters are modern group of power electronic converters which can overcome problems with traditional converters. The Z-source inverter is a novel topology that overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter and current-source converter. The concept of Z-source was used in direct ac-ac power conversion . Similarly, the concept of Source also was extended to dc-dc power conversion

5. BLOCK DIAGRAM PIC MICROCONTROLLER 5V DC SUPPLY 12V DC SUPPLY AC SUPPLY
DRIVER CIRCUIT
AC SUPPLY
BRIDGE RECTIFIER
Z SOURCE INVERTER
LOAD

6. APPLICATION Industrial appliance improve the reliability.
Boosting feature of converter makes it proper for new energy applications.

7. REFERENCES:
E. Muljadi and H. E. McKenna, “Power quality issues in a hybrid power system,” IEEE Trans. Ind. Appl., vol. 38, no. 3, pp , May/Jun  
F. Giraud and Z. M. Salameh, “Steady-state performance of a gridconnected rooftop hybrid wind-photovoltaic power system with battery storage,” IEEE Trans. Energy Convers., vol. 16, no. 1, pp. 1-7, Mar 2001.
Yaow-Ming Chen, Yuan-Chuan Liu, and Sheng- sien Lin, “DoubleInput PWM DC-DC Converter for High-/Low-Voltage Sources,” IEEE Trans. Ind. Electron., vol. 53, no. 5, October  
Yuan-Chuan Liu and Yaow-Ming Chen, “A systematic approach to synthesizing multi-input dc–dc converters” IEEE Trans. Power Electron., vol. 24, no. 1, January