Load and Voltage Balancing in Harmonic Power Flows by Means of Static VAr Compensators

Abstract

In special applications, static VAr compensators (SVC) with thyristor controlled reactors (TCR) are used to balance unbalanced loads or to eliminate voltage unbalances at the terminals of the SVC. In both cases, load balancing and voltage balancing, the TCR can present a significant unbalanced behavior that produces important quantities of noncharacteristic harmonics. In this paper, the formulation and solution of the load and voltage balancing problems are developed for harmonic power flows obtained from a combination of two blocks: a conventional load flow (CLF) and an iterative harmonic analysis (IHA). In both blocks, the treatment of load and voltage balancing is described in detail. Load flow calculations and harmonic analysis show the presence of noncharacteristic harmonics in these two situations.