Dynamic synchronization system and methods

A system for continuously predicting a frequency of an input line power waveform of alternating current having a maximum value, a minimum value, and a reference value located between the maximum and minimum values, the system comprising:

• an outer window module to specify an outer window defining a sense point of the waveform between a lower limit and an upper limit of the outer window, the sense point being located away from the reference value, the sense point having a corresponding predicted sense point time;
• an inner window module to provide an inner window having an inner time interval less than an outer time interval corresponding to time between the lower limit and the upper limit;
• and
• a processor module to position the inner window at the predicted sense point time, to identify an actual sense point time of a measured inner sense point value of the sense point in the inner time interval and excluding one or more identified actual outer sense point values of the sense point being both outside of the inner time interval and within the outer time interval, and to calculate the frequency of a future cycle of the waveform based on the actual sense point time.