Power Quality in a Smart Grid Distribution System Using Automatic OLTC
OLTC On line tap changer. ADC analog to digital converter, SG smart grid, DS distribution system, UM universal motor.
this paper is mainly focused on distribution of power with quality throughout the day. It is proposed in this to provide automatic control circuits to operate the available On Load Tap Changers (OLTC) effectively. The available taps and its voltage levels may be analyzed and suitable applications solution will be automatically generated to select and operate the desired tap to deliver the quality of power to meet the system voltage close to the rated voltage. These programs may be pre-loaded to operate OLTC‟s at the power generating stations, Sub stations. Micro controllers are system based controllers may be installed to operate the OLTC‟s from 11Kv to 400Kv power and distribution transformers. Universal motors or step drive motors or servo motors may be operated by the controller on auto with the aid of programs pre-loaded. No manual commands and controls needed if the OLTC is put on auto mode
In the distribution transformers also all the tap positions may be effectively utilized by providing automatic OLTC‟s with the aid of local operated controllers or remote operated auto controllers. In this paper voltage transducers are used to sense the voltage and ADC to convert into digital signals. These digital signals are fed to the controller or interfaced computers. Controller or the computer programs checks the present voltage and its required suitable controls from the available solution data table. The necessary controls are generated and operated the drives to operate the on load tap changing devices. These controls are being initiated at the moment of deviation occurs in the system voltage desired quality band. It is also planned to include the high resolution advance graphics files in C programs to represent the present status of the OLTC with its connected tap position. The taps operated and the voltage levels may be recorded and represented graphically with time scale.