Power Grid Corporation of India Ltd and the Transmission Corporation of Andhra Pradesh (APTransco) together have established a fully computerised unified load dispatch and communication (ULDC) scheme which is now fully operational.
All generating stations in Andhra Pradesh and all extra high-tension substations of Tamil Nadu, Karnataka, Kerala and Pondicherry are connected to the ULDC for supervisory control and data acquisition.
An agreement has been signed between PowerGrid and APTransco with regard to the ULDC project implemented by PowerGrid for southern region at a cost of Rs 650 crore. Under the ULDC project 1,500 km of optic fibre network is laid over transmission lines and two pairs are used for the project.
According to an APTransco press release here, data of all the operating parameters such as voltages, frequency, active and reactive power, along with status of equipment from all the connected stations are transmitted on real time under ULDC for more efficient grid control.
The events are also recorded with time stamping at the sub-load dispatch centres in each State and the State load dispatch centres at Hyderabad, Chennai, Bangalore, Kalamaserry and Pondicherry where the systems are time synchronised with the global positioning system.
PowerGrid and APTransco have also entered into another agreement for erecting second 500 MW high voltage direct current (HVDC) module at Gazuwaka for availing additional power assistance from eastern and southern regions and for smooth evacuation of power from Simhadri power project.