INTRODUCTION SWITCHING SEQUENCE A single resistor on-load tap changer comprising fixed contacts F1 and F2, transitional arcing contact T, main arcing contact M and bridging resistor R is shown in Fig. 1. A command initiates the switching operation from normal running position 1 to position 2, such that contact T starts to move left towards contact F2 (Fig. 1a). As T approaches F2 a recovery v...

The installation of Distributed Generation (DG) can have a significant impact on distribution system voltage regulation. The effects vary according to the DG device: in particular, synchronous generators present voltage control systems which interfere with the voltage regulation of the distribution systems. The paper analyzes two voltage control schemes for synchronous generators connected to M...

Abstract: In order to improve the intelligent diagnosis level of an on-load tap-changer’s (OLTC) mechanical condition, a feature extraction method based on variational mode decomposition (VMD) and weight divergence was proposed. The harmony search (HS) algorithm was used to optimize the parameter selection of the relevance vector machine (RVM). Firstly, the OLTC vibration signal was decomposed ...

This paper presents a method of optimal coordination of load shedding, capacitor switching and tap changer operation using a dynamic system model in order to preserve long-term voltage stability. The method is based on model predictive control and tree search. A model of the controlled system, including the network and load dynamics, is used to predict the future system behaviour based on the c...

The purpose of the paper is to analyze the transient stability of an industrial cogeneration system in Hsin-Chu Science-Based Industrial Park using ETAP software. The cogeneration system is installed two 161kV/161kV high-impendence transformers with tap-changer to connect with TPC for decreasing the short-circuit fault current and increasing the fault critical clearing time. The transient stabi...

The recent success of general purpose crowdsourcing platforms like Amazon Mechanical Turk paved the way for a plethora of crowd-enabled applications and workflows. However, the variety of tasks which can be approached via such crowdsourcing platforms is limited by constraints of the web-based interface. In this paper, we propose mobile user interface clients. Switching to mobile clients has the...

Distribution network connected distributed energy resources (DER) are able to provide various flexibility services for distribution system operators (DSOs) and transmission (TSOs). These local system-wide offered by DER can support the frequency ( f) voltage U) management of a future power with large amounts weather-dependent renewable generation electric vehicles. Depending on magnitude deviat...

In this study, a multi-objective optimization method is proposed to solve day-ahead voltage control problems in distribution systems. The main purpose determine the optimal schedule for on-load tap changer (OLTC) settings at sub-station and switched capacitors (SC) based on load forecasting. criteria presented study include: (1) minimizing deviations transformer bus, (2) total power loss. metho...