How can I calculate"the r.m.s. voltage refreshed each half-cycle 'U rms(½) ' value of the r.m.s. voltage measured over 1 cycle, commencing at a fundamental zero crossing, and refreshed each half-cycle".
Ths is a requirement of the german system operator (Tennet). Seems overly specific and perhaps close to the value delivered by a standard PSCAD rms 0.5sec smoothed meter measurement?