Litgrid

Synchronisation with the Central European Synchronous Area (CESA) is the last step towards Lithuania’s energy independence. Currently, our electricity system is still dependent on frequency control in Russia, but already in 2025, it will operate in one synchronous area together with the systems of other European countries.

On 27 May 2019, the Baltic transmission system operators signed an agreement with the continental European operators on the synchronisation of the Baltic electricity systems with the continental European grids.

In order to work synchronously with the continental European grids (CEG), the Baltic electricity system will have to comply with the requirements of the frequency recovery process applicable to CEG, which stipulate that the Baltic energy systems will have to install automatic generation control systems (AGC).

The AGC system is one of the cornerstones of any power system, helping to ensure a stable frequency, its parameters and flows in interconnectors. Currently, the Baltic States are part of the unified Russian energy system (hereinafter - UPS / IPS), in which the frequency is managed centrally from the Moscow dispatch centre. CEG frequency management is decentralized, divided into frequency management zones (LFC blocks), which are responsible for frequency quality and system balance management and must have reserves for frequency hopping and recovery determined in accordance with the general CEG requirements.

General project information

An automatic generation control (AGC) system is the maintenance of the deviations and frequency of the interconnection power balance of the electrical system within the set limits and the load distribution of the generators involved in the control using secondary and / or primary regulation.

The implementation of the AGC system consists of the purchase and installation of the equipment. The procurement technical specification will be prepared in accordance with the terms of reference prepared by Litgrid together with the Continental European Operators Consortium and agreed with the Baltic operators.

After the installation of the AGC system, the frequency of the Lithuanian electricity system and the alternating current flows of the AC with the energy systems of Poland and Latvia will be controlled automatically during the 15-minute imbalance settlement periods. The instantaneous deviations of the frequency from the nominal value of 50 Hz and the active power flows must be restored within 15 minutes by activating the standardised frequency control reserves.

Work calendar

Activities	Date of implementation
Announcement of the purchase of an automatic generation management system	2022 Q1
Signing of the contract	2022 Q3
Project completion	2024

Project financing

The project is co-financed from the Connecting Europe Facility (CEF).