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НаименованиеGas Turbogenerator Control System

 

This article examines a control system for the 1,500 kilowatt, GTG-1500-2G gas-turbine generators used in the PGTES-1500 mobile electric power stations designed for use at compressor stations on gas mains in oil and gas fields. When the mobile stations were developed, ship generators were incorporated into the design. These generators had to be adapted to run on natural gas and in extreme conditions, requiring the development of, among other things, a new combustion chamber and a new control system.

The old control system, based on relay automation, was replaced with a system based on Octagon Systems' MicroPC microprocessor technology, chosen because it is highly reliable, capable of working in extreme temperatures, PC-compatible and relatively inexpensive, and because it comes in a broad set of functional modules.

The automatic control system for the GTG monitors the generator's performance, executes the operator's commands, automatically shuts down the generator in the event of an emergency, sends out alerts when threshold parameters are exceeded and controls the speed of the generator. The system receives 32 analog signals from various sensors, two frequency signals from speed sensors and 96 discrete signals, and it sends out two analog signals to indicator devices and 32 discrete output signals to the equipment.

The control system includes consoles for local and remote control, as well as for controlling the generator and the batteries, relay and vibration-control units, and processing and integration units.

The local control console, located with the power unit, takes in and processes data from the sensors, and it allows for operating the generator. Operational problems or emergencies trigger an alarm and a visual alert. Information on the unit's operational parameters is provided on a 240- x 80-pixel display. The control system draws 24 volts from a rectifier unit that is powered by two groups of batteries, ensuring constant power. The main and backup controllers in the local control unit are based on Octagon Systems' MicroPC technology. The analog signal processors used in the units are Analog Devices' 5B series modules.

The remote control console, located separately from the power unit, is similar to the local console, with which it connects via an RS-422 channel. This console is also based on the MicroPC technology, is equipped to receive, transmit, process and display information, as well as to control and monitor the generator.

The system runs on a real-time multitasking operating system, which allows software developers to focus not so much on the issues involved in synchronizing processes executed in parallel, as on the code that actually executes those processes. Programming in this operating system is done in Assembler and C.

This control system underwent testing at the wells of Tyumenburgaz and is currently in a pilot. The cost of the PGTES-1500 is half that of similar Western power stations.

 

PGTES-1500 electric power station in the vicinity of Novyi Urengoy.
 

By Sergey Antonenko, Aleksandr Boikin, Mikhail Verpakhovskiy, Vladimir Volchek,
Yevgeniy Yefremov and Dmitriy Khalpakhchi

Sergey Antonenko,  Alexander Boikin,  Mikhail Verpakhovsky,  Vladimir Volchek,  Evgeny Efremov,  Dmitry Khalpakhchi