Abstract
To increase the electrical power quality, in the last decades, an intense development in the last decades of high-performance equipment built as advanced power electronics applications, such as the compensators from Switching Power Converter category, has taken place. For all that, Reactive Power Compensators (RPC) based on passive circuit elements, such as Static var Compensators (SVCs), still occupy a wide range of applications in customer and installations of the distribution system installations. The functions of power factor (PF) improvement and load balancing in a three-phase distribution network can be achieved with an unbalanced SVC, known as the Adaptive Balancing Reactive Compensator (ABRC). Presenting first the mathematical model of the initial sizing and the working mechanism of a Balancing Reactive Compensator (BRC) for a three-phase four-wire network, this article develops a compensator resizing algorithm through an iterative change of the initial sizing to transform the compensator into a Balancing Capacitive Compensator (BCC), which keeps the same functions. By using two computational and modeling software tools, a case study on the application of the method was carried out, demonstrating the availability of the sizing problem solution and validating the unbalanced capacitive compensation as an efficient way to PF improving and load balancing in a PCC (Point of Common Coupling).
Highlights
The problem solved by the method proposed in the present paper is to find those values of the weighting factors for which the values of the susceptances from the real compensators structure (Figure 2), obtained by connecting the fictitious compensators in parallel, result negative or null values
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Many applications intended or distribution compensators as static reactive power compensators (SVCs) remain validthat for the many applications intended foroperation consumers or is system operators.such. It is for those applications criterion of installation and costs distribution system operators
Summary
Excessive reactive power load and three-phase voltage set asymmetry are two of the most important problems to be solved to ensure a high level of power quality in a PCC [1,2,3]. The accelerated evolution of technologies has made SPC equipment technically superior; the main arguments in this respect being: it allows for a more accurate adjustment, has a quicker response, is more compact and occupies smaller spaces and is quieter Since it includes few passive circuit elements, SPC results in less active energy losses and has a higher energy efficiency. The article briefly summarizes the mathematical model used to understand the operating of a Balancing Reactive Compensator (BRC), complemented by a new set of relationships to calculate the susceptances of the BRC structure, which are the basis for the new sizing method These susceptances are written according to symmetrical components of the load currents that they compensate. A case study, performed using two software tools, confirms the mathematical model and validates unbalanced capacitive compensation as an efficient way for PF improving and load balancing
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