All power system extensions in the UCTE grid have up to now been based on two principles. The individual Transmission System Operators (TSOs) are committed to these. They require the adherence to a common set of standards for operating the interconnection and its development, as well as upholding the rules of the common electricity market. In applying these principles, relatively small power systems were connected to the UCTE in a step by step procedure by adopting the UCTE standards in their entirety for the operation and reliability of such systems.
However, the marginal conditions for the present feasibility study are quite different from those applied to all former system interconnections. Contrary to the standardised UCTE system integration analysis procedures, this study has investigated the system coupling of two large electrical power systems, both having different regulations, standards and operating philosophies. The Figure illustrates the different principles of system integration and system coupling.
The two synchronous areas have been operated independently using different operating procedures and regulations for some considerable length of time. Therefore, the feasibility of the synchronous interconnection has not only to be defined in terms of the compatibility of technical performance, but also that of organisation and management within a consistent legal framework in order to ensure a secure and reliable interconnection. A mandatory set of technical, organisational and legal requirements needs to be defined in order to avoid any negative influence of one system on the other. However, the technical standards and internal regulating of each system will, as far as possible, remain unchanged providing that they do not have any negative impact on system security.
