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Abstract- In the field of power quality (PQ), characterizing and quantifying the disturbances by means of indices represent a key activity of electrical energy market . Disturbances must be characterized to assess system PQ performance & quantifying disturbance levels allows for benchmarking analysis.. Traditional PQ indices, such as voltage and current total harmonic distortion, Unbalance and SARFI, separately analyze PQ disturbances, ranging from continuous to discrete.. In some cases, instantaneous values of voltage, which contemporaneously include all disturbances, can be the main cause of failure or malfunction of electrical components. Moreover, a good PQ index can significantly reduce the enormous amount of stored data covering various types of disturbances. A single index allows internal and external benchmarking and easily quantifies the respect of items inside power quality contracts. This paper introduces a proposed matrix method considering continuous disturbances and voltage dip/sag indices relevant to a site so that a comprehensive ranking of the sites could be made.
Index Term- Power Quality, Power Quality Indices, Voltage sag, Continuous disturbances and events.
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I. INTRODUCTION
The interest of regulators and the gradual rise in awareness of the effect of power quality disturbances on equipment by customers has lead to many utilities beginning to take a much more pro-active stance toward the measurement of power quality levels on their networks. Combined with the continual connection of modern power electronics equipment which produces and/or is susceptible to power quality disturbances, routine power quality monitoring is becoming increasingly important for utilities in order to plan for and maintain acceptable power quality levels on their networks. When considering how to report power quality it is important to be mindful of what the utility is interested in or needs to know.[1-7]
II. TYPES OF CONTINUOUS DISTURBANCE INDICES
Continuous disturbance indices provide the basis for the overall indices. Further Continuous disturbance indices are classified as voltage (AVD), unbalance, flickers, harmonics and sags.[10-16]
A. Voltage (AVD)
Voltage level is not technically a disturbance and is the only primary power quality quantity for which the optimum measurement should not ideally be zero. Thus a method of voltage reporting is required that creates a condition whereby zero is the optimum result and increasing values indicate increasing levels of disturbance.
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