Development of New Variable Drive for DC bus load using ORCAD Software

Abstract

This paper represents the various application using variable frequency drive like renewable energy sources such as control of solar, fuel cells etc. Here the DC is not consistent with these inputs and tends to differ and can cause disruptions to load. The AC to DC rectification process is done there are two types of rectification but here we use only uncontrolled rectification is preferred, since the controlled has some disadvantages like triggering, and it cannot used for higher frequencies. The requirement here is the source of the variable DC, so the source of the variable DC is obtained from varying the AC source. And the DC obtained distorted in the DC capacitor link. And sensing the DC bus is important to prevent the overcurrent and overvoltage damage of overall circuitry for sensing of DC bus current and voltage values, here isolated amplifiers are used. Major part of development of variable DC bus is Selection of the components like Rectifier, configuration of DC link Capacitors with Pre-charging circuit and the balancing resistors. The MATLAB and ORCAD models have been designed for 45kW load and the input is varying AC voltage range from (415V-600V) and the output obtained is varying DC maximum of 1000V and the simulation result is validated in the proposed system.