Design and test results of a software based digital AVR

The design and test results of a digital automatic voltage regulator are described in the paper. The basic control unit is a mini-computer supported by a digital hardware interface, signal transducers and a teletype. The flexibility of the digital AVR software has been exhibited in both open-circuit and synchronized tests. Digital AVR operation has been categorized into two modes, i.e., normal and special. Observations made from various tests allow guidelines to be laid as to the best possible manner in which to operate the digital AVR. A large number of features and control options have been incorporated into the design and have proven very useful in determining the best approach to be taken in digital control of a generating unit.