engleski

Reliability assessment of Croatian power system in open electricity market environment

In the new open market and economy environment the assessment of reliability of interconnections has become a more complex task, as it involves modeling of the new functions of wheeling and interchange contracts. The classical approach to reliability assessment and classical reliability indices are no longer used in the open electricity market environment. The reliability indices originally conceived and still in use today are those describing the behavior of the vertically integrated (VI) utilities. Now a new set of reliability indices has been defined and computed for power systems operating in the interconnections. This paper will first present the theoretical background of reliability assessment of the interconnected power system in the open electricity market according to the CIGRE Report Task force 38.03.11. After that a new set of defined reliability indices for the open electricity market and system operation in interconnection will be introduced and computed for the Croatian TSO (HEP TSO-Transmissions System Operator). HROTE is the Croatian Energy Market Operator. Currently, there is only one electricity market in Croatia. In the initial phase of market opening, the model of the bilateral market has been chosen and the electricity trading has been carried out through bilateral contracts. HROTE announced the first trading electricity market rule on December 8, 2006 in which all relations between participants in the electricity market are defined. The paper presents the computation of reliability indices of the Croatian electric power system, more precisely of the Croatian HEP TSO in interconnection with all the neighbor countries. The CBT (Cross Border Transactions) agreements with Hungary, Slovenia, Serbia and Bosnia and Herzegovina will be considered and included in the reliability assessment. A set of load point indices for main 110 kV load supply points, system reliability indices and interconnection reliability indices will be computed

reliability assessment; open electricity market; interconnection; cross border transactions; reliability indices; transmission system operator

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