This oeportdescribesan enhanced testsystem ( W W ) f o r MW In bulk power system reliability evaluation studies. The value of the tost system is that it will permit comparative and benchmark studios to be perf0me-d on new and existing reliability evaluation techniques. The test system was developed by modifying and updating the original IEEE RTS (referred to as RTS79 hereafter) to reflect changes In evaluation methodologies and to overcome perceived deficiencies. -The first version of the IEEE Reliability Test System (RTS 79) was developed and published in 1979 [ l ] by the Application of Probability Methods (APM) Subcommittee of the Power System Englaeering Committee. It was developed to satisfy the need for a standardized data base to test and compare results from different power system reliability evaluation methodologies. As such, was designed to b@ a reference system that contains the core data and system parameters necessary for composite reliability evaluation methods. It was recognized at that time that enhancements to RTS It should be noted that In developing and adopting the various parameters for RTS-96, there was no Intention to develop a test system which was representative of any specific or typical power system. Forcing such a requirement on RTs-98 would result in a

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A group connected HVDC transmission scheme is a variant of the unit connection where instead of a single generator, a group of generators are directly connected to the converter. Studies conducted in the past indicated that significant cost reduction can be achieved using this scheme. This is mainly due to the elimination of many components which results in considerable capital and operating cost savings to the utility. Concerns regarding the reliability performance of unit connected schemes were raised, however, there has not been a detailed reliability study conducted. This paper addresses the reliability evaluation aspect of a group connected scheme and compares the reliability performance of the group connected scheme with that of the conventional common collector system. Reliability models for both schemes were developed using a hypothetical system model based on the Nelson River system. Practical system component outage data was used to examine the reliability performance of both schemes.(HVDC)Transmission, unit connection, hydro electric generation.

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