Advanced Automatic Generation Control Systems and Operating Philosophies for Islanded Power Stations.
Electricity Grid Schematic
The reliability of transmission and distribution networks is typically measured with industry standard indices such as:
· SAIFI (System Average Interruption Frequency Index)
· SAIDI (System Average Interruption Duration Index)
· CAIDI (Customer Average Interruption Duration Index)
· ASAI (Average Service Availability Index)
For Islanded Power Stations, the reliability of the power generation can have a significant impact on the reliability indices for the distribution network.
Modern control systems are generally automatic for efficiency and reliability. Key factors in reliable power generation are the determination of the operating philosophy and the design of the generation control systems.
The operating philosophy is tailored to the application. It has an impact on the design of both the electrical power network, the protection system and the control system.
Factors and challenges, which can influence the design of the control system and the determination of the operating philosophy, are typically:
· The reliability required for the application e.g. mining, utility, industrial, critical power
· The intended method of operation, level of sophistication
· The power station outputs
· Type and number of generator units
· The fuel system to be used
· Integration of renewable energy sources and distributed generation
· Integration of energy efficiency e.g. waste heat recovery
· Legacy power stations, if the station is being restructured or expanded
· Frequency and voltage regulation
· Import / export control with inter-connected power stations