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In a power plant, synchronous machine work as an alternator after coupling with a prime mover (turbine). Machine discussed in this paper is a special alternator of 1500MVA rating used to supply power in a short circuit test laboratory. This alternator was initially driven by a prime mover. It is well known that a single synchronous machine can work at a time either as a motor or as a generator. With this concept, the prime mover of the said alternator was removed to make it in dual mode operation. This is achieved with the help of three static devices; they are static frequency converter (SFC), static excitation system (SES) and power electronic controllers. This paper begins with the detailed description of SFC and SES. Thereafter it looks into the starting techniques in pulse link mode and synchronous mode. Commutation methods for thyristors under different bridges are also listed out. It has also been explained about running this large machine as motor and converting it to generator for extracting power required for electrical tests. Various modes of operation (e.g. starting, running & stopping) and their inter changeability are also mentioned herewith. Savings in energy is the major outcome of the dual mode operation of this large machine. The energy saving techniques adopted on this machine is also part of this paper.

Operational Benefits in Large Synchronous Machine with the Application of Static Drives