Abstract
Although there currently exists a wide range of voltage regulators that are commercially available, the search for devices with a simpler physical design remains the focus of research studies. Following this line, an electromagnetic voltage regulator (EVR) arrangement has been proposed. The EVR is constituted of an autotransformer that supplies, via discrete taps, a series transformer that injects voltage for regulating the feeder voltage. Even though its operating principle is shown as being similar to that of other devices on the market, the physical arrangement and operating strategy of EVR show novelties which result in properties such as: economic attractiveness, constructive simplicity, and operational reliability. Moreover, when installing voltage regulators, efficacy studies must be carried out to optimize equipment design. In this context, this paper aims at evaluating the factors that influence the effectiveness of the EVR in restoring voltage variations according to the determinations imposed by regulatory agencies. The ultimate goal of this study is to determine the voltage deviation range that the EVR is able to restore. To achieve this goal, a mathematical modeling of the EVR is given and study cases are computationally carried out to investigate its performance when connected to a typical distribution feeder.
Highlights
AMONG the electrical power supply requirements imposed on power utilities, power quality indices are included, such as long-duration and short-duration voltage variations, harmonic distortions, unbalances, etc
This paper aims at evaluating the relationship among these influencing factors since they define the range of voltage variations that the electromagnetic voltage regulator (EVR) can restore to the adequate voltage level set in the standards
As exposed in the introduction, the EVR was initially proposed by [11] and a similar device was materialized as a commercial product by [14] [15]
Summary
AMONG the electrical power supply requirements imposed on power utilities, power quality indices are included, such as long-duration and short-duration voltage variations, harmonic distortions, unbalances, etc. Even though the efficacy of the EVR injection has been verified for a constant load consumption [11] [12], its effectiveness for a load with dynamic behavior must be further investigated Variables such as the long-duration voltage variation magnitudes, the feeder and load parameters, and the available taps of the EVR are features that will strongly affect the performance of the device. In this context, this paper aims at evaluating the relationship among these influencing factors since they define the range of voltage variations that the EVR can restore to the adequate voltage level set in the standards. A detailed performance evaluation study and computational case studies are carried out to achieve the goal proposed in this paper
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