Integrated system for control and monitoring in real time of efficient electrical and thermal energy production
Authors: Ion Miciu, Florin Hartescu
Venue: Proceedings of the 8th conference on Applied informatics and communications (2008)

The integrated monitoring and driving system is made of main distributed components: - first level:_one or two computers placed in the control room which monitors the thermal and electrical processes based on the datas provided by the second level via PROFIBUS; these are monitoring the technological process and the electrical operations from the power plant. - second level: PLCs (performant programable automation devices interconnected at the first level via PROFIBUS or ETHERNET by fiber optics) which collects datas from the process by the field instruments and, based on it's own application program, transmit informations on the first level, and also take commands from this level which are further, passed to the third level (which contains the execution elements); - third level: field elements consisting in 3 categories: data collecting elements; data transfer elements from the third level to the second; execution elements which take commands from the second level PLCs and executes them after wich transmits the confirmation of execution to them. The purpose of the automatic functioning of the entire co-generative power plant is the optimization of the co-generative electrical energy commissioning in the national energy system and the commissioning of thermal energy to the consumers. The performed tasks of this system are: commissioning of thermal agent into the thermal distribution system depending on the outside environment temperature; the assurance of a constant temperature of the thermal agent passed to the thermal distribution system accomplished thru roughly and fine adjustments; maintaining the temperature on the return circuit of the thermal system in pre-established limits with the scope of boiler protection and increasing of thermal energy production efficiency; maintaining a constant pressure of thermal agent commissioning - function provided by the circulation pumps unit equipped with a frequency converter. The integrated system treat the functioning of all the equipments and devices as a whole: - gas turbine units (for each gas turbine: active power awareness, active & reactive power, the power factor, the active and reactive power, the contractual power, etc) - MT 20kV mean voltage station (ON/OFF signaling of the mean voltage cell interupters; ON/OFF commands of the mean voltage cell interupters; - TG-JT 0,4 kV low voltage station (ON/OFF signalization for automatic circuit breakers coupling and voltage bar sections) - main hot water boilers (burned gas temperature, round / re-round hot water temperature, tub re-circulation position, work / out of work state of the pre-circulation pump, presence of the water in the input channel of circulation, work/out of work state of the boiler, etc.) - hot water boilers (temperature of the hot turn/return water, work/out of work state of recirculation pumps, position of the recirculation tub, etc.) - gas compressor group, - thermic agent circulation pumping group (work/out of work state of the pumps) - water treating station (work/out of work state of the addition pumps, position of the electrical auctioned tubes)