Abstract

It is known that the use of synchronous motors in variable speed drives to simultaneously generate mechanical power and reactive power is among the most effective methods of improving the power factor in electrical distribution networks. Also, the adoption of automatic excitation control has expanded the application field of synchronous motors to handle high-load shock drives. Modern digital control systems designed for controlling the excitation of synchronous motors have revitalized the significance of these machines. This paper presents a synchronous motor excitation control system that provides a fully digital solution for the design of equipment to supply excitation and control the operation of high power synchronous motors. This system can be easily parameterized for low and medium voltage synchronous motor drives of various rated powers, with asynchronous starting capability. An application of the system to the realization of an equipment for excitation power supply and operation control of high power synchronous motors is also presented. The equipment was realized in prototype version and after successful laboratory tests it was successfully produced in series and used to build electric drives for ore mills using asynchronous motors of 2.93 MVA.

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