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Project title: Improvement of hydrogenerators operation by developing excitation systems with a view to increasing their energy efficiency and competitiveness

Contract: 21040/14.09.2007
Contracting authority: National Center for Program Management
Contractor: ICMET Craiova
Project manager: Eng. Petre Pistol
Program 4 – Partnership in priority fields
Research direction: Energy
Project type: PC
Project acronym: GENEX

Period of project development: 14.09.2007 – 18.11.2010
Project total value: 1.151.212 lei
From budget: 1.151.212 lei
Co-financing: 0 lei

Partners involved in project:
Project leader (CO) – INCD - ICMET Craiova
Project Manager: Eng. Petre Pistol
Partner 1 – “Politehnica” University of Timisoara
Project responsible: Prof. Dr. eng. Biriescu Marius
Partner 2 – Romanian Academy - Timisoara branch
Project responsible: Dr. eng. Madescu Gheorghe
Partner 3 - University of Craiova
Project responsible: Prof. Dr. eng. Alexandru Bitoleanu

Project summary:
At present, electric power generation is almost entirely done by means of synchronous generators. They are usually average and high power electric machines, with long useful life - of about 30 years. After this period, they are rehabilitated. That is why their operation with maximal energy efficiency and reliability in supplying the electric networks is an essential requirement .
Nowadays, most of the synchronous generators in the country are either with rotating exciters – direct current generator, or with rotating diodes. Only few units at national level have variants of static excitation. Lately, for reaching the performances of voltage control resulting from the regulations imposed by the Union for the Co-ordination of Transmission of Electricity (UCTE) and TRANSELECTRICA, the updating of the excitation systems of synchronous generators is particularly studied.
The researches for developing some excitation systems intended for hydrogenerators, produced as sole pieces or small series pieces having high electromagnetic constants and high inertial masses which could lead to dangerous overvoltages in case of transient states, have priority.
The project is focused on the theoretical and experimental study of excitation systems with digital control, with a view to increasing the efficiency and automating the energy generation in hydroelectric power stations.
The project is thus related to the present researches on the development of some auto-adaptive digital regulating systems and on the improvement of regulating strategies, having as execution element the static excitation systems. These new systems are exclusively focused on reducing the overvoltage peaks and on developing some modules for de-energizing-forcing the excitation, assuring high response rate.
For reaching the objectives, the partners should perform the following main activities:

- Study on the present stage of the researches in this field: structure of the existent systems, limits, disadvantages, trends and prospect solutions;
- Choice of a static excitation solution for an experimental model;
- Drawing up of technical specifications and execution documentation for a laboratory experimental model;
- Achievement of a laboratory experimental model with static excitation and voltage control for 15 kVA salient-pole synchronous generator
- Tests and experimental studies on model;
- Final report on the got results;
- Result dissemination and technological transfer to interested customers.

This project, which has a laboratory model as practical achievement, should be continued in a subsequent phase within the framework of other partnership, focused on achieving a homologated prototype. For that reason related to the outlooks of the development of applications in this field, the final report will contain specifications for carrying out a prototype, in its summary.

Schedule for project achievement:
2007: Stage I: Analysis of the solutions for modernizing the electric hydrogenerator excitation
Period: 14.09.2007 – 15.12.2007
Stage value: 40.000 lei
2008: Stage II: Achievement of execution documentation for experimental model
Period:16.12.2007 – 15.07.2008
Stage value: 598.000 lei
2009: Stage III: Achievement of experimental model
Period:16.07.2008 – 28.02.2009
Stage value: 350.000 lei
Stage IV: Experimental studies on the achieved model
Period: 01.03.2009 – 15.02.2009
Stage value: 69.276 lei
2010: Stage V: Demonstration of the achieved model functionality
Period: 16.12.2009 – 18.11.2010
Stage value: 93.936 lei

Project impact
a) technological transfer of the studied solutions to hydroelectric power stations, to storage hydroelectric plants in course of carrying out or rehabilitation, inclusively. As regards this component of the impact, the following aspects should be emphasized:

• from all the hydrogenerators in the country, having an installed power of 6363 MW, in 124 large hydroelectric power stations and 223 micro hydroelectric power stations, more than 90% deliver energy with obsolete excitation systems, having a low degree of automation, low energy efficiency, thus being not compatible with the EU power grid. The rehabilitation process started or will start at all these hydroelectric power stations;
• the hydro-power potential still not fitted up, assessed to be of 5400 MW (which is an extremely important energy source) is facing with the same problem of modern solutions for excitations, which take into account the automation and compatibility with the European Community

From these aspects it results the major technical and economic impact in the area of efficient generation of clean energy.
b) Increase of the efficiency in generating electric energy from non-polluting sources (hydro-energy);
c) Development of the applications in the field of storage hydroelectric plants of medium and low power, possible to be achieved in the near future;
d) Involving and training of young specialists, which could assimilate and develop modern solutions for generating energy in hydroelectric power stations connected into a power system compatible with EU.