A survey of current practices for transient voltage dip/sag criteria related to power system stability

There is a vast amount of literature dealing with voltage dips/sags related to power quality. The purpose of this survey, however, is to provide information on transient voltage dip/sag criteria following fault clearing related to power system stability. Information is included in this paper from utilities, reliability councils, relevant standards, and industry-related papers. One intention of this paper is to provide information for power system planning or operating groups of utilities, independent system operators (ISOs), or reliability councils seeking to establish such criteria. The material in this survey is based on published criteria from sources related to system performance, namely NERC (North American Electric Reliability Council), WECC (Western Electricity Coordinating Council), MAPP (Mid-Continent Area Power Pool), WPSC (Wisconsin Public Service Corporation), ONS (Electric System National Operator of Brazil), EdF (Electricite de France), China, TVA (Tennessee Valley Authority), and two sources related to equipment performance, namely ITIC (Information Technology Industry Council), and SEMI (Semiconductor Equipment and Materials Institute) F47. Three additional unpublished draft guidelines related to system performance from two North American utilities, (both in the northeast) and one southwest North American reliability council are also presented.