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4 Analysis, Findings and Results
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4.4 Operation and Organisation
The organisational aspects (i.e. operational procedures at the technical interface, the coordination of strategies and methods among the interface TSOs, etc.) are considered as a bridge between the technical measures and their implementation, as well as for the necessary legal framework.
The IPS/UPS does not have a formal set of common technical standards that can be applied to the entire synchronous area. Hence, the “UCTE-IPS/UPS Interface Procedures” were initially based on the UCTE Operation Handbook. This was used as a reference check list for elaborating the interface rules and regulations, as well as for the corresponding EU legislation.
The investigations have considered the present system control structure in the IPS/UPS: The overall frequency control function is currently being carried out by the Russian system operator, while other systems are operated by means of agreed power balances with or without the correction of frequency deviations. The key proposal from the organisational and operational viewpoint is to apply the UCTE control block structure to the IPS/UPS where IPS/UPS as a whole is acting as one single control block.
There could be changes in the future to the IPS/UPS control block structure (e.g. the IPS in the Ukraine and the Moldavian system could form a separate control block). If changes were made to the present IPS/UPS structure, such changes could not be taken unilaterally and should be mutually agreed upon.
The IPS/UPS control block operator (CBO) is responsible for the coordination of the members in the IPS/UPS. It would act as a control block coordinator with one of the main co-ordination centres in the UCTE (Brauweiler, Laufenburg, etc.). A decision has to be taken on the control block structure and the responsible CBO for the IPS/UPS synchronous area before the concept of a synchronous coupling can be further developed.
In order to be able to act as CBO, the responsible IPS/UPS company needs to adapt the current secondary controller (pure frequency control) into a power/frequency controller. This implies that the tele-measurement of the real-time power flows must be integrated into the new power-flow secondary controller.
Therefore, legally binding commitments need to be prepared and agreed upon with all operators involved that can provide adequate solutions to these issues. These include such issues as inter-area cooperation agreements with the TSOs, legal rules covering system reserves, as well as specific contracts with generators in regard to power system stability, etcetera.
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