Using digital signal processor for excitation system of brushless synchronous generator

In the paper digitally based excitation systems for the synchronous brushless generators are presented. A digital control system is realized with a digital signal processor ADSP-2001. System configuration, control functions with their structure functions are also presented. The control system has two feedback loops: the main one is based on a generator's voltage and the inner one based on excitation current of the exciter. Beside basic function of a voltage controller the digital system has some other control functions, like: limits of minimal and maximal exciter current, compensation of the voltage (based on reactive and active current characteristics), voltage/frequency characteristic, and possibility of communicating with higher system levels.