Lossless and Stateless Compression of IEC 61850 Sampled Values Flows

This letter proposes a lossless and stateless compression method for IEC 61850 Sampled Values flows. A set of bitmaps is introduced to indicate the size in bytes of the sampled currents and voltages, and to flag the presence or absence of the Quality field. The method has been evaluated for different profiles, and it can provide bandwidth savings between 30 and 52%, with a very low computational cost as a counterpart. It has been implemented and tested in two different hardware platforms, with traffic generated by a Merging Unit. The processing delays have been found to be acceptable, showing a good tradeoff between compression rate, complexity and added delay.