Studies and reviews

+31.08.2017 The isolated operation of the Baltic states

The feasibility study on the isolated operation of the Baltic States has been finalised by the end of August 2017. The study has been ordered by Litgrid, AST and Elering, the electricity transmission system operators of respectively Lithuania, Latvia and Estonia, and prepared by the international consulting company Tractebel Engineering S.A.

The feasibility study on isolated operation of Baltic States launched in January 2017 and finished in August 2017, analysing the capability of the power systems of Baltic States to operate in isolated mode. The study analysed the technical, legal and economic aspects of the isolated operation of the Baltic States.

The performed study established a set of technical requirements and guidelines in order to prepare and perform an isolated operation test of the Baltic States power system. These guidelines provide an overview and timeline of the additional investments, studies and trainings to be performed before the test. The validation of generating units and system dynamic behaviour with PMU measurements is considered to be a key aspect in the test preparations. The direct and market costs of preparing and executing the isolated operation test have been calculated. A legal analysis of the possible obstacles has been presented.

An isolated operation test of the Baltic States power system is challenging, but possible taking into account the technical recommendations made in the power system dynamic analysis report and the requirements and guidelines for the isolated operation test. In these reports several scenarios have been analysed with different load levels in all Baltic countries, with and without HVDC connections and Kaliningrad region. Based on the static and reliability analysis performed, the summer period has been identified as the most suitable period to conduct the isolated operation test. Amongst others, technical recommendations have been made by consultant on the primary and secondary reserve provision and the set of must run units, to guarantee frequency stability after credible contingencies. Special attention during the test has to be paid to the maximum power infeed requirements and the generating units minimum power output.

Essential to a successful isolated operation are dispatchers trained to handle the changing system behaviour during isolated operation. These trainings should especially focus on managing frequency stability with changing load, maintaining reserves, islanding and resynchronisation procedures and emergency operation.

No major legal or regulatory obstacles against isolated operation have been identified and a set of recommendation has been composed in order to overcome any.

Finally an 18 hours test duration with several generation and load rejection tests is recommended in the summer of 2019 over the time window 10pm to 16pm the next day.

After the decision on the exact date of Isolated Operation Test, Market Participates will be informed following standard Nord Pool procedures.

 

+13.07.2017 Integration of the Baltic States into the EU electricity system: A technical and economic analysis

In the spring of 2017 European Join research center has finalised the study “Integration of the Baltic States into the EU electricity system: A technical and economic analysis”. Upon investigating possible technical and economic scenarios on de-synchronizing the networks of Baltic countries from power systems of Russia and Belarus and synchronizing with networks of Europe, has been concluded that from the technical and economic point of view it would be more favorable for Baltic countries to become synchronized with continental Europe, as it has been stated in the study prepared by the European Join Research Centre and published by European Commission.

The study has been performed based on previous international agreement on the integration of Baltics into the common European energy system and energy market and, based on the above mentioned study, European Commission together with Baltic countries will come to later decisions on the variants of de-synchronization and respective scenarios of implementation.

In the study carried out jointly by the European Joint research center, AS “Augstsprieguma tikls” and other Baltic TSO`s three possible synchronization variants have been analyzed – synchronization with the Nordic power systems, synchronization with the networks of continental Europe as well as island operation of Baltic countries without synchronous ties with neighboring power systems. In the study all three possible synchronization scenarios has been compared in the timeframe of years 2025 and 2030.

The executive summary of the study "Integration of the Baltic States into the EU electricity system. A technical and economic analysis" can be found online in the publications web-page of European Union.

+17.11.2015 RES perspective in Baltic countries

Baltijas elektroenerģijas sistēmu izolētas darbības priekšizpēte tika pabeigta 2017. gada augusta beigās. Pētījuma pasūtītāji ir Baltijas valstu pārvades sistēmas operatori (turpmāk – PSO) Lietuvā, Latvijā un Igaunijā, attiecīgi Litgrid, AS “Augstsprieguma tīkls” un Elering, kuri ir atbildīgi par elektroapgādes drošumu un elektroenerģijas pārvadi Lietuvā, Latvijā un Igaunijā, savukārt pētījumu veica starptautisks konsultāciju uzņēmums Tractebel Engineering S.A.

Baltijas elektroenerģijas sistēmu izolētas darbības priekšizpēte tika uzsākta 2017. gada janvārī un pabeigtā tā paša gada augustā, analizējot Baltijas valstu elektroenerģijas sistēmu jaudas pietiekamību, darbojoties izolētā režīmā.

Pētījuma definēti tehniskie noteikumi un vadlīnijas, lai sagatavotos un veiktu Baltijas valstu elektroenerģijas sistēmu testu, strādājot izolētā darba režīmā. Vadlīnijas sniedz pārskatu un laika grafiku par nepieciešamajām papildus investīcijām, pētījumiem un apmācībām, lai sagatavotos izolētas darbības testam. Testā iesaistāmo ģenerācijas vienību apstiprināšana un sistēmas dinamikas mērījumi ar jaudas uzskaites vienībām (Power management unit – PMU) ir pieņemti kā svarīgākie aspekti sagatavošanās procesā pirms testa. Tāpat ir aprēķinātas tiešās un uz tirgu balstītas izmaksas, gatavojoties un izpildot izolētas elektroenerģijas sistēmas darbības testu, kā arī veikta juridiskā analīze par iespējamajiem šķēršļiem un kavēkļiem saistībā ar testu.

Pētījumā norādīts, ka Baltijas valstu elektroenerģijas sistēmu izolētas darbības tests ir izaicinājums, to iespējams veikt, ja tiek ņemtas vērā visas tehniskās rekomendācijas, kas minētas elektroenerģijas sistēmas dinamiskās stabilitātes analīzes ziņojumā, kā arī izstrādātajās prasībās un vadlīnijās izolētas sistēmas darbības testam.

The purpose of the review is to compare the development policy of power plants using renewable energy sources (RES) in three Baltic countries: 20-20 targets set in Lithuania, Latvia and Estonia, the current measures for the spur of RES integration and the requirements and conditions for the RES integration into the power systems. The review also contains the expert evaluation of the impact of the EU leaders agreement about the climate change targets for 2030 on the power systems in the Baltic countries.

The review indicates all three Baltic countries have taken the necessary measures to implement the 20-20 targets for the RES development. The conditions for further development are similar in all three countries and the attractiveness of investments to RES will depend on the political will.

The review was carried out by the Baltic PSOs: Litgrid (Lithuania), Augstsprieguma tikls (Latvia) and Elering (Estonia).

Review of RES perspective in Baltic countries till 2030 can be found here.

 

 

+11.12.2013 Synchronous operation study: The Baltic States integration to the EU internal electricity market

The feasibility study on the interconnection variants for the integration of the Baltic States to the EU internal electricity market has been accomplished. The study has been ordered by Litgrid, Augstsprieguma tikls and Elering – electricity transmission system operators of Lithuania, Latvia and Estonia in cooperation with a Swedish consulting company Gothia Power.

The feasibility study launched in May 2012 and finished in October 2013, analysing possible scenarios for connecting the electricity systems of the Baltic States with the European Continental Network for synchronous operation. The study analysed technical, legal and socio-economic aspects of the interconnection of the power systems.

The performed study allows establishing technical requirements for the development of the Europe’s synchronous area and connection of the power systems. Possible costs of the synchronisation project implementation in order to connect power systems of the Baltic States with European Continental Network for synchronous operation have been calculated. Connecting the electricity systems of the Baltic States with the European Continental Network for synchronous operation is challenging but possible project from a technical point of view, i.e. with respect to power flow, control and stability. However, reinforcements are needed in the present power system of the Baltic States, in Poland, and in Kaliningrad (when synchronous with Continental Europe), control and reserves have to be upgraded and a number of back-to-back converters towards Russia and Belarus have to be installed. Special attention has to be paid to the design parameters for the planned Visaginas power plant in Lithuania, since it would be the limit setting unit in many operational situations, especially in island operation. The large size of the planned Visaginas unit also requires quite large reserves.

No major legal or regulatory obstacle against a synchronisation has been identified, but a number of issues have to be negotiated, resolved and agreed on.

The investment costs and annual costs for a change of synchronous operation are high, compared to the market benefits.

Although, no traditional technical or economic argument has been identified that can justify a change of synchronisation from the present United Power system to the Continental Europe system, there might very well be other driving forces, e.g. strategic or political.

The Executive summary of Project Feasibility study on the interconnection variants for the integration of the Baltic States to the EU internal electricity market” can be found here.