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Compact Modular Energy Storage System (EZ5). The IPP pulsed energy storage system consists of three flywheel-motor-generators EZ2 (167 MVA, 1450 MJ), EZ3 (144 MVA, 500 MJ), and EZ4 (220 MVA, 650 MJ). The stored energy is delivered to the magnets and additional heating of the Experiment ASDEX-Upgrade during pulses of 10-20s length. The stored energy is recharged in the interval between pulses by the 10kV motors. The EZ3 and EZ4 generators are each connected to a 10,5kV (110-85 Hz) pulsed network, to which are connected the thyristor controlled converters (magnet power supplies and additional heating power supplies). An extension of the IPP energy storage system is required to allow operation with long plasma pulses as well as to allow research in new high plasma current scenarios. This shall be realised by a new energy storage system EZ5 to be parallel connected to either of the generators EZ3 or EZ4. The EZ5 system shall also be suitable for stand-alone operation. The Compact Modular Energy Storage System (EZ5) shall consist of five Energy Storage Units (ESU's), each rated 10,5kV, 8 MVA, 32 MJ (110-85 Hz). Three design variants are catered for, namely: one flywheel-motor-generator (FMG) per ESU (variant A), two FMG's per ESU (variant B), and four FMG's per ESU (variant C). Each ESU comprises the flywheel-motor-generator(s), a multi-winding UNIT transformer to step-up the voltage of the FMG's to 10,5W, variable-frequency converters for the start-up and shutdown of the FMG's, a variable-frequency converter for the acceleration of the paralleled FMG's to the operational speed, as well as switchgear for the syncronisation of the FMG's within the ESU, and ist syncronisation within the EZ5 system. Each ESU also includes both voltage and reactive power feedback control. Furthermore, an infrastructure common to all ESU's is to be included, comprising a 10,5kV switchboard, a 10kV/690V transformer, a 690V switchboard, a 400V distribution board and 230V UPS. A comprehensive Control and Monitoring System is to be included to ensure modularity and flexibility: it is to be structured in three levels (System, Unit, Module) and shall ensure the autonomous operation of the lower levels. Further, a hard-wired Protection and Interlock System, based on conventional protective relays, shall guarantee a reliable and selective tripping of the faults at the Module, Unit and System levels.