PLC BASED CONTROL SYSTEM FOR TURBOGAS UNITS

The authors describe a modular control system development for Turbogas Power Units (TPU) based on a PLC (Programmable Logic Controller). The starting up control sequence, protections, process supervision, anti surge control and speed/load regulation functions were developed and implanted in a modern high performance PLC according to the state-of-the-art IEC 1131-3 programming standard. Simulation tests were carried out with a dynamic mathematical model of a TPU implanted in an industrial PC (Personal Computer) with hardware interfaces for input/output process signals. The results demonstrated the feasibility of the control system strategy over the whole operating range. With little effort, the control system can be easily implanted in other PLC´s (from different manufacturers) thanks to the modular design of the software. The software with modular structure can accept changes of the control strategies