A practical approach for determining voltage imbalance contributions from suppliers and consumers

摘要

Objective(s) I regards to the matter of determining voltage imbalance contributions on three-phase electric power systems, it is a fact that, except for the Superposition method, no procedure has proved to be trustworthy. However, the application of the Superposition method in the field may face some challenging aspects. In this perspective, this paper is aimed at proposing an innovative approach to overcome the challenges concerning the Superposition method application on actual grids. To achieve such a goal, a method based on a controlled state-change of the system, by connecting a known source of imbalances is proposed, which is here defined as the Single-phase Capacitor Switching method. Methods In order to highlight the method effectiveness and feasibility, the approach is verified by means of computational and experimental investigations. These are carried out taking into account different operating conditions related to imbalance sources. Results The Single-phase Capacitor Switching method has presented a good response in computational and experimental studies, since the results are in line with the expected physical behaviour in relation to the prevalent source of voltage imbalances. Conclusion Therefore, the Single-phase Capacitor Switching method, along with the Superposition method, presents itself as promising for determining voltage imbalance contributions between the parts involved.