“…A triangular membership function and a constant membership function were chosen for the input signals and the output control signal, respectively. Seven fuzzy sets, namely, negative big (NB), negative medium (NM), negative small (NS), zero (Z), positive small (PS), positive medium (PM), and positive big (PB), are used for both the input and output membership functions [17]. From expert knowledge about HDGT performance, the range of membership functions for e , ce, and C were selected as [0, 1], [-1, 0], and [-1, 1] respectively.…”