Success Story: Electrical Energy
Energie Ouest Suisse and Grande Dixence S. A. (Switzerland)
Automation of Europe's Largest Peak Demand Hydro Electric Power Plant (423 MW)
I. CUSTOMER ENVIRONMENT / PROJECT CONTEXT
Energie Ouest Suisse and Grande Dixence S. A. produces electricity for the largest distribution companies in western Switzerland and transports it via a high voltage transmission network. To satisfy the growing demand for peak energy in Switzerland, Italy and France as well as utilise the huge water reserves in the Swiss Alps, the company decided to develop a new facility as a major extension to an existing hydro electric power plant.
EOS engineering, a subsidiary of the power plant owner founded for this specific project, completed the configuration and commissioning of the automation.
Customer objective and constraints:
The customer wanted to develop a new facility (Cleuson Dixence) and implement a control system that would provide:
II. SOLUTION IMPLEMENTATION
Implementation methodology (main phases):
The project was completed in 2000.
Solution overview (services, products, systems, architectures...):
After a detailed evaluation phase, Schneider Electric provided a solution based on Modicon Quantum programmable controllers for the automation part of the project. 90 Quantum PLCs automate the new turbine generator units and the extensive auxiliary installations. The Quantum PLCs have been programmed with Concept, the IEC 1131 programming software of Schneider Automation.
A key requirement in this project however, was the collection and time tagging of events from the auxiliary installations and their transfer to a remote control centre. For this task the Quantum ERT time tag modules have been used successfully. They are time synchronised via a DCF 77 receiver in this project.
Communication between, and programming of the PLCs is achieved quickly and efficiently via a Modbus Plus network, in both standard wire and fibre optic. Third party devices for special tasks have been integrated via special bridge Mux modules.
For structuring reasons the system has been divided into 3 independent identical systems for the turbine units, with 25 PLCs each and a general system with 15 PLCs. The individual parts of the system can be manually controlled at the local level. There is a control room inside the plant with an HMI system for each of the four groups. The PLCs are connected to the HMI systems via the serial high speed network Modbus Plus.
An Ethernet connection is provided for a supervisory centre in Sion, from where the power plant can be remotely controlled and monitored.
Modicon TSX Quantum PLCs support the system structuring approach by having Modbus and Modbus Plus integrated into the CPUs. The PLCs are located in control cabinets and communicate with each other via Modbus Plus. Modbus Plus is used for system communication, as well as for distribution of I/O periphery.
For connection of subsystems over long distances and for communication in EMC disturbed environments, some of the Modbus Plus lines are fibre optic. Bridge Mux modules have been used for integration of the 3rd party modules. A Bridge Mux offers the possibility to connect several devices with Modbus interface in an uncomplicated way to a Modbus Plus network.
The functions are in detail monitoring and control of:
The general system controls the following devices:
Each system contains an HMI station, a time processor for synchronisation and a unit for DCF 77 processing (for time tagging of events), as well as a parallel manual operation for emergency handling.
III. RESULTS / ACHIEVEMENT
Schneider Electric differentiating values VS competitors:
IV. ADDITIONAL INFORMATION
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