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3. Data Acquisition and System Modelling
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3.4 Coupling of the Systems – the Interface
The nine tie lines (three of 750 kV, four of 400 kV and two of 220 kV) considered as being available for the coupling itself are shown in the Figure: Eight links connect Ukraine with its Western neigbours and one 400 kV line links the transmission system of Moldava with Romania.
The transmission lines and the “MIR” power system were operated as an integral part of the IPS/UPS up to 1995, prior to Poland, Hungary, Slovakia and the Czech Republic being synchronously interconnected to the UCTE. These lines need to be refurbished and partly reconstructed in order to have a synchronous coupling between the UCTE and the IPS/UPS.
Due to their independent development in the past, major differences in the system structure and operation philosophy exist between the UCTE and the IPS/UPS. The UCTE system is developed using the n-1 contigency as the planning criterion, whereas in the IPS/UPS, this criterion is met with the support of a set of operational actions mainly comprising of load and generation shedding.
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