This document contains the Grid Code Specifications for Grid Energy Storage Systems (hereinafter referred to as "Specifications") required by Fingrid Oyj (hereinafter referred to as "Fingrid"), by virtue of the system responsibility imposed on Fingrid, of converter-connected grid energy storage syst Contact online >>
This document contains the Grid Code Specifications for Grid Energy Storage Systems (hereinafter referred to as "Specifications") required by Fingrid Oyj (hereinafter referred to as "Fingrid"), by virtue of the system responsibility imposed on Fingrid, of converter-connected grid energy storage systems which are to be connected to the
This document defines Specific Study Requirements for type D battery energy storage systems (BESS) connected to specific locations in Fingrid''s network where use of grid forming controls (GFM) is seen as necessary. These requirements are also applicable for other networks connected to Fingrid''s network.
The Grid Code Specifications describe the technical and operational requirements of the equipment to be connected and the process by which the exchange of information in projects must be carried out.
"The grid code requirements are set according to the size of the facility from class A to class D. Almost all of the grid energy storage currently in use in Finland belongs to class A, meaning that the capacity is less than one megawatt.
Energy and climate policies that support sustainable development are generating a need for new energy storage solutions. Key drivers in this field include the electrification of transport, the integration of renewable energy production such as wind and solar power, an increased need for grid resiliency and security of energy supply as well as new,
Grid code specifications for power generating facilities. Power generating
Fingrid on julkaissut 21.6.2023 erityistarkasteluvaatimukset (SJV2019 /
Imbalance power between Finland and Sweden Imbalance price from 1.11.2021
By virtue of the system responsibility on Finland, Fingrid has set the requirements for electrical systems and power plants connected to the Finnish power system. Whereas general principles and terms for connections are defined in Fingrid''s General Connection Terms (YLE) and the of the Main Grid Contract (KVS), more detailed requirements are given in Grid Code Specifications which are presented separately for power plants, demand connections (consumption), grid energy storage systems and HVDC connections. The Terms and Specifications also apply to electrical systems and power plants connected to the customer''s electricity network.
The Grid Code Specifications describe the technical and operational requirements of the equipment to be connected and the process by which the exchange of information in projects must be carried out. By complying with the requirements, we ensure that the connected equipment can withstand the voltage and frequency fluctuations caused by the power system, they do not cause interference in the power system and that they operate reliably in different operating situations and also during disturbances. The requirements also help network operators to gain access to the necessary information about the equipment.
Compliance with and verification of Grid Code Specifications is the responsibility of the Connecting Party connecting to the grid. It is important to take this into account in the agreements with suppliers. Similarly, it is advisable to start planning and exchange of information well in advance between the supplier, the related customer and the grid company, and possibly also with the distribution network company.
The current Grid Code Specifications are presented on their own pages, which also contain instructions and other background documents that complement the actual Grid Code Specification documents. The requirements are divided as follows:
- Grid Code Specifications for Power Generating Facilities, VJV- Grid Code Specifications for Demand Connections, KJV- Grid Code Specifications for High Voltage Direct Current Systems, HVDC (only Finnish version available)- Grid Code Specifications for Grid Energy Storage Systems, SJV
Previous (obsolete) Grid Code Specifications and related material can be found on the "Archive" page.
Following instructions closely related to Grid Code Specifications can be found on the Main grid contract page:
Supply of reactive power and maintenance of reactive power reservesThe document describes the requirements for reactive power reserves for power plants connected to 110 kV and 400 kV and calculation of reactive power limits applicable at the point of connection.
Real-time information exchangeThe document describes the real-time measurements required to be sent to Fingrid. The measurements must be implemented before the power supply through the connection point can begin.
Teemu RissanenExperttel.+358303954287
"Last autumn, we specified the technical grid code requirements for converter connected grid energy storage facilities connected to the power system of Finland, and we submitted our proposal to the Energy Authority for commenting. We anticipate that the Energy Authority confirms the requirements in spring 2020. We have not yet connected any energy storage facilities to the main grid, but we will probably do so soon," says Antti Kuusela, an Expert at Fingrid.
At present, Finland''s largest grid energy storage facility is a six-megawatt facility at the Viinamäki wind farm, but it has not yet been commissioned.
"The grid code requirements are set according to the size of the facility from class A to class D. Almost all of the grid energy storage currently in use in Finland belongs to class A, meaning that the capacity is less than one megawatt. It is important that the grid energy storage facility remains within the frequency and voltage range specified in the requirements when it is connected to the grid and that it can withstand the voltage and frequency fluctuations that occur in the power system. Grid energy storage is typically used to deliver a frequency-controlled reserve."
Fingrid ensures that the main grid operates reliably.
"The combined effect of grid energy storage must be taken into consideration when assessing the operating capacity of the main grid. It is in everyone''s interests to have coherent requirements and a functioning system," Kuusela summarises.
Fingrid Oyj Läkkisepäntie 21 00620 Helsinki Tel. 030 395 5267
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