Power System Operation and Control can simply be defined as the real time manipulation of certain status quantities based on the Power system design. These quantities are classified as follows
1. Integer- variables
* Tap – settings on a Power transformer
This is used to vary the secondary voltage to enhance quality of voltage being transmitted to consumers. * Status of circuit breakers, RMU fuses, feeder-pillar fuses etc.
2. Continuous variables
* Generator excitation system
* The governor system
Optimal System Operation and Control is best achieved by excellent performance of the power system protection/relay schemes
SCADA AND POWER SYSTEM CONTROL
The ability to perform operations at an unattended location from an attended station or Control Centre and to have a definite indication that the operation have been successfully carried out can only be achieved through the SCADA (An acronym for supervisory control and data acquisition) System. It can also be defined as a collection of equipment that will provide an operator at a remote location with sufficient information to determine the status of a particular equipment or process and to cause actions to take place regarding such equipment or process without being physically present. Data acquisition refers to collecting data in form of measured analog current and voltage or the open and close status of contact points. Power System Supervision is carried out by operators and maintenance engineers through this acquired data. Control is referred to as sending command messages to a device to operate.
AIMS/GOALS OF SCADA SYSTEM IN POWER CONTROL
* To provide adequate protection for the power equipments with the system integrity intact. * To maintain very good system security with provision of high quality services. * To provide economic and environmentally acceptable system operation and control...