Adaptive clock offset estimation for protection devices without time-based synchronization

Abstract

The present disclosure relates to systems and methods for protecting electric power equipment. In one embodiment, an oscillator generates a time signal to timestamp a first stream of data comprising a plurality of local measurements. A communications interface may receive a second stream of data comprising a plurality of remote measurements from a remote source through a communication channel. The second stream of data may include a plurality of timestamps. A clock offset estimation subsystem may determine a plurality of clock offset values based on the second stream of data, analyze the second stream of data; identify a plurality of valid raw clock offset values within the second stream of data; and generate a prediction error. An adaptive filter subsystem may determine an adaptive gain using an adaptive filter and apply the adaptive gain to the prediction error based on conditions of the communication channel.