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DSP based excitation controller for synchronous motor

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  1. Introduction
  2. Overview of synchronous
  3. Types of excitation system
  4. Power factor control and VAR operation
  5. Protection and conclusions
  6. References

Induction motors are widely used in industrial production processes. Use of an induction motor will result in increased lagging power factor. This power factor must be corrected by adding capacitors. If not, the result is the penalty of larger kVA burdens to the interconnected system. The synchronous machine, with the aid of an intelligent excitation controller, can control power factor to reduce the plant reactive loading to the connected system. This paper provides information regarding to the digital excitation system. In this system DSP320F2811 is used. Different modes like power factor control and var operation are also discussed. Simulation of the proposed topology is given. This paper will also address to the typical protections, which are included in this excitation system. Keywords: Excitation System, Field Current, Power Factor Control, Synchronous Motor

[...] Since they are not built with slip electric contacts, avoiding sparking, synchronous brush less excitation motors are recommended for explosive atmosphere applications SYSTEM DESCRIPTION Block diagram of the proposed excitation system is shown in Fig As shown in block diagram, 3phase controlled rectifier is used to get the D.C. current, which is given to the field by changing the firing angle of SCR, the excitation current can change. Power Factor is sensed by monitoring the voltage across motor's two phases and current from third phase. [...]


[...] ARMATURE CURRENT - POWER FACTOR LEADING LAGGING UNDER EXCITED REGON OVEREXCITED REGION FIELD CURRENT Fig.1 Motor V Curves The relationship is more clearly illustrated for a typical case in Fig.2. This gives the relationship of power factor as a function of load at rated field current. When a 1.0 power factor motor is operating at rated field and rated torque output the power factor is unity ( 1.0 As the load decreases the motor's power factor becomes leading. Conversely, as the load increases beyond rated, the power factor becomes leading. [...]

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