1.1、The Main Features of Excitation System

Fast speed and high accuracy of control:

Adopting multiprocessor system, Harvard structure, parallel processing, multiple assembly line and high-speed DSP kernel, its data processing speed and accuracy are greatly increased. 32 channels of analog acquisition for each cycle (every 20 milliseconds) are the direct sampling of 144 high-speed AC, and completely eliminate the influence of zero drift on measurement accuracy through Fast Fourier Transform (FFT).

 

* Multifunction:

The control mode of PID regulation, nonlinear optimum, linear optimum, power system stabilizer and fuzzy logic is optional.

* Complete digitalization and high reliability:

* With the surface mount technology, multilayer printed circuit boards and chip of military class, its key chips adopt the mature products of well-known enterprises at home and abroad. Ensure 100,000 hours of the mean time between failures (MTBF).

* Unique software design:

* Apply the Flash ROM and support the bootstrap loader and remote maintenance.

* Communication and network functions:

* The function of software potentiometer: the processing circuit of all analog quantities has canceled the potentiometer replaced by the software potentiometer that can be set on the menu; therefore, the deb ing becomes more easy and flexible.

* Convenient and intuitive man-computer interface

* The brushless excitation system has the function of rotating rectifying disc failure detection

* Reliable de-excitation system:

Perfect self-check, control and protection function, which is used to protect the excitation device itself and safe operation of synchronous generator:

* Mutual spare mode of dual channels:

* Capacity of resisting disturbance

1.3、Main Technology Index and Function

  1. Adjusting precision (constant excitation current) :≤0.5％.

 2. Adjusting range: 5％～130％

  3. Adjusting frequency: not less than 300 time/seconds

  11. 4 ~ 20 mA output: 2 roads 4 ~ 20 mA output (isolation), 16 bits resolution.
 

 5, A/D conversion: 32 road input, 18 bits resolution.

  6. A/D conversion rate: 400 K/S.

  7. Phase shifting range: 10-150 degrees, upper and lower limit can be set.

  8. Power factor: four quadrant power factor measurement.

   9. Switch value I/O: 24 roads switch value photoelectric isolation input, 24 roads switch value output, including four roads use photoelectric isolation output, 20 roads use relay output.

 10. D/A output: 2 roads isolation D/A converter, each has A D/A output which can all choose in the menu the variable output.
D/A range: 2 roads-2 V ~ + 2 V (isolation), 16 bits resolution

  4. Thyristor control Angle alpha resolution: 0.0048 degree/bit code