Unified power quality index (UPQI) for continuous disturbances

Abstract

Power quality indices are being developed that attempt to quantify certain aspects of service quality. There has been considerable amount of work on the characterization of individual types of power quality disturbances and corresponding indices. However, there does not exist in the literature a standard approach that allows one to quantify the overall power quality. This paper proposes a unified power quality index (UPQI) as a useful tool for ranking sites as to their overall power quality. Absfrod-Power quality indices are being developed that attempt to quantify certain aspects of senire qualih. There has been considerable amount of work on the characterization of individual types of power qualie disturbances and correspanding indices. However, there does not exist in the literature a standard approach that allows one to quantify the overall power quality. This paper propares B Unified Power Quality Index (WQI) as a useful tool for ranking sites as to their overall power quality. Disciplines Physical Sciences and Mathematics

A global index for discrete voltage disturbances

“…Among the latter type, the Unified Power Quality Index (UPQI) proposed by Gosbell et al (2002) considers only continuous disturbances. The evaluation of this index is obtained by performing a multi-step procedure.…”

“…Among the latter type, Gosbell et al proposed the Unified Power Quality Index (UPQI) where only continuous disturbances are taken into account [4]. In this paper, the UPQI is extended to discrete disturbances like voltage dips, swells, and transients that appear to be most critical for future regulation.…”

“…The second typology properly handles traditional power quality indices to ascertain a value for the overall voltage quality [3,4].…”

Assessment of Power Quality performance in distribution networks part II - Performance Indices and ranking of network buses

“…Reference [4] suggests a data mining method for structuring and classifying the recorded data, before calculating a global PQ index. References [5,6] suggest a multi-level structured framework for PQ data analysis and compression and propose Unified Power Quality Index (UPQI) for overall PQ assessment. In [5,6] the UPQI is applied to combine continuous-type phenomena only and in [7,8] to include the event-type phenomena.…”

Global assessment of power quality performance of networks using the analytic hierarchy process model

“…The earliest reported work [5] compared the recorded voltage sine-wave to the ideal expected sine-wave, and assessed the performance of several PQ phenomena like sag, harmonics and transients. References [6,7] proposed a framework for compressing the recorded PQ measurements of different phenomena into one index by normalising and numerically consolidating the different PQ phenomena indices. References [8][9][10] adopted the cost of PQ disturbances in the overall evaluation of PQ, by adopting an Analytic Hierarchy Process (AHP) model.…”