Multi-clock synchronization in power grids

A time-synchronizing power grid system, comprising:

• a plurality of timekeeping substations, wherein each substation comprises one or more clock devices;
• and
• a system time controller device in communication with the plurality of timekeeping substations;
• wherein:
• the clock devices report clock data to a group time controller device;
• the group time controller device is configured to select a group best clock by applying the Best Master Clock Algorithm to the reported clock data to select a candidate group best clock, elect a reference value using an N-input voting algorithm, compare the candidate group best clock to the reference value using an accuracy threshold, and report the group best clock to the system time controller device;
• the system time controller device is configured to select a grand master clock from the reported group best clocks using a fault-tolerant average algorithm;
• and
• the clock devices are configured to synchronize to the grand master clock.