Digital excitation regulator AVR description

Digital excitation regulator AVR of the reference input is stored in the microprocessor random access memory (RAM) in a number, the reference input and on behalf of the generator output voltage feedback quantity comparing voltage deviation are obtained.The output of the generator power to acceptable by calibration circuit into a computer, and then through AID converter converted to digital quantity.The comparison between a given amount of reference and feedback through the mathematical program of microprocessor.Comparison results on the stored in the microprocessor control logic programs, to complete the expected control algorithm.

in Digital excitation regulator AVR In the complex control algorithm can be realized.Traditional control algorithm including so-called proportion, integral PID algorithm, etc., can also use linear or nonlinear control theory and fuzzy logic and the new theory of control algorithm, such as adaptive control is converted into analog signal output control program to drive in the excitation system

The power amplifier unit.Output of the analog signal can be gained through D/A converter and pulses can be sent directly by the microprocessor to provide power amplifier unit.The generator excitation voltage and current supplied by the power amplifier unit.

Digital excitation regulator AVR of the universal method of man-machine interface function is through the keyboard and display and communication functions such as serial communication.Communication of data with the input value, the output value, given value, the internal state of signal, the limiting value, control relay and fault condition, etc.Communication data with other controller in the system, such as governor or monitor, information exchange, the variables may also directly control configuration of excitation system, the specific operation of the system.

In the digital excitation regulator AVR reference given the adjustment, such as setting, manual excitation generator voltage setting, the setting of power factor of the reactive power machine and so on are the digital quantity, through the input node to increase or decrease the distance of the microprocessor, or directly through the computer control of the power plant network will adjust on the above number.

In addition, the digital system can also be recorded in the excitation system parameters, including the input to the excitation system and its internal parameters, through D/A converter to the external data recorder, or cycle inside the computer record 0 data should be with filter and reset function.

In terms of meter measuring, most of the simulation system for external instrument equipment to measure various parameters in the system, and digital system can display these parameters, need not plus transmitter, etc.Digital system can also send the data to PC power plants, leaves out the measuring instrument and wire connection.

Compared with analog system, digital system can provide more information and control function, and easy to implement, digital system generally has the detection function, can be found in advance system internal fault, and safe and orderly failure partially lifted.The parameters of the digital system is easy to set, can significantly reduce the excitation system commissioning

The time and effort.