The Renewable Energy Sources and their Role in the Power Energy System

11-15 November 2007, Italy

WEC 2007

The Renewable Energy Sources and their Role in the Power Energy System

Ing. Igor Chemišinec, Ph.D.OTE – The Czech Electricity Market Operator

Operátor trhu s elektřinou, a. s. -

The Czech Electricity Market Operator

Faculty of Electrical Engineering

Czech Technical University in Prague

Prof. Ing. Jiří Tůma, DrSc.

Ing. Miloslav Fialka

Fac. of El. Engineering, CTU in Prague

Czech Republic

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CTU in PragueCTU in Prague

AGENDA

The role of renewable energy sources (RES) in the Czech State Energy Conception

Economical support for renewable energy sources in the Czech Republic

Technical aspects of the operation RES Conclusion

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AGENDA




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The Czech State Energy Conception

The Energy Sector - significant impact on the environment levelSustainable development The global problem of the world is to ensure it It is impossible to express it in an empiric way its definition is a result of experts discussions and agreements

The Czech Republic is aware responsibility for creating of conditions for reliable and long-term safe supply of energy at the acceptable prize and at creating conditions for its effective utilizations, which will not threaten the environment and will be in accordance with policy of sustainable development State

Energy Conception State Energy Conception creates the balance between energy market and reliable energy supply, environment protection and support of research and

development.

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The Czech State Energy Conception The SEC's main goals

Independence SafetySustainable

development

… on the imported primary energy sources

… on the imported primary energy sources from unreliable countries

… on the reliability of the primary energy sources

supply

energy system decentralization

reliability of the energy supply

… of energy sources, incl. nuclear safety

economy & social development

environment protection

Proceedings for reduction of energy import dependence:-increase of energy effectiveness-support of renewable sources -extension of operational life of domestic potential reserve of solid fuel

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The Czech State Energy Conception

The Czech Republic has to perform following long- time goals:1. to fulfil of EU strict emission limits in 2010 (i.e. SO2 265 000 tons, NOx 286 000

tons)2. to fulfil of international obligations from Kjoto protocol and from another

agreements fixed on it.3. to create conditions for higher use of renewable energy sources- determination

and performance of the national indicative intent of electricity production from RES due to gross electricity consumption (8% for year 2010).

4. to create conditions for progressive rise rate of renewable energy sources in domestic consumption of primary energy sources in 15 - 16% for year 2035.

5. to create conditions for higher use of secondary raw energy sources and for rise of the rate of alternative fueling in transportation.

Higher support intent of the renewable sources usage was observed in the State Energy Conception

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0

2

4

6

8

10

12

14

16

2000 2005 2010 2015 2020 2025 2030

(TW

h)

Biomass Small hydroelectric power station Wind Photovoltaic Biogas

Production of electricity from RES

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AGENDA




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Two supporting systems: form of redemption prices form of green bonuses

Electricity producers can choose from these two support systems, whereas they can not combine the support manner

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Redemption prices enforced for electricity supplied and measured

in transfer point of production and network of operator related distribution (transmission) system

comes into accounting of subject of settlements responsible for losses in regional distribution (transmission) system

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Green bonuses enforced for electricity supplied and

measured in transfer point of production and network of regional distribution (transmission) system operator

and supplied to electricity salesman by producer or to authorized consumer and then for another own electricity consumption

gives to producer possibility of choice of the selling (price) of produced energy to any final consumer or salesman

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Review of feed-in tariffs and green bonuses for chosen technology in the Czech Republic

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Renewable energy sources and electricity prices

Process of the rate of final consumers on the coverage ancillary expenses

*change of the calculation method, instead presumption production used

reality for previous period

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Influence of the support RES on the electricity price in the Czech Republic

Electricity 48,13%

Distribution40,66%

Transmission3,39%

System services ČEPS6,21%Decentralized

generation0,30%

Renewable source and CHP

1,12%

Market operator OTE

0,18%

Share of price components on prices paid by end customers for low voltage level (NN) in 2006 (without VAT)

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AGENDA




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Renewable energy sources and power system

GG GG

transmission system

distribution network



consumption consumption consumption

G G

conventional plants

RES

• DSO/TSO has obligation prior to connect RES to given part of the distribution system• but this connection and operation of RES have influence over distribution system

It is necessary to do consultations with DSO/TSO, for purpose of solving questions, concerned about choice of connection place, technical conditions, connection type and especially operation.

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The most important influences of operation RES

operation of renewable

energy sources

island in a power system

control of active and reactive power

impact on stability of

power system

metering and regulation

quality of electricity

protectivereliability of

supply

electro- magnetic effects

harmonics of voltage and

currentflikr

impact on frequency

The connection and operation of RES must fulfill minimum of technical, plans, operation and information requirements, which are lay dawn in “Grid Code” of DS or TS.

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Conclusion Importance of the State Energy Conception Big attention is given to Renewable Energy Sources Electric energy originating from renewable energy sources can

not economically compete with electric energy from classic energy sources

The principles of support of these energy sources and their influence on the power cost by final consumers were described.

The connection and operation of RES have influence over distribution/transmission system

Main focus has to be given to the role of renewable energy sources in connection to reliability and security of the electric energy supply and its quality.

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Ing. Igor Chemišinec, [email protected]

Ing. Miloslav Fialka [email protected]

Thank You for your attention!

http://www.ote-cr.czhttp://k315.feld.cvut.cz

Prof. Ing. Jiří Tůma, [email protected]

Documents

The Renewable Energy Sources and their Role in the Power Energy System