Computation of the short-term flicker severity index

Short-term flicker severity (P_st) is an important electric power quality index defined by the International Electrotechnical Commission (IEC). P_st results from the statistical evaluation of flicker over short periods of time producing an objective measure for flicker originating from various types of sources. This paper reviews previous methods for computing P_st and proposes a new iterative algorithm. The algorithm is computationally efficient and shown to comply with the IEC standard