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Improving the Computer Aided Power System Operation in Ecuador: Enhancements to SCADA/EMS

Abstract:

SCADA (supervisory control and data acquisition) is a sophisticated system that allows controlling devices via coded signals into communication channels. Its main function is to allow the control of remote power system devices from a remote control center. In addition to the SCADA, complex software is required in order to analyze the data obtained from the system. Without proper analysis, the operator might not be able to take a correct decision of operation. Therefore, Energy Management Systems (EMS) have been designed with the aim of aiding power system operators to carry out the better decision making in real time. CENACE, as the Ecuadorian Power System Operator, has a SCADA/EMS system that is currently facing a full upgrade. Among this upgrade, the problem of lack of adequate modeling of three-winding transformers with tap changers has been addressed by this paper. Thus, a novel three-winding transformer model has been proposed and implemented in the new EMS version at CENACE. State estimation results obtained after implementation of the modeling changes demonstrate the benefits of the proposed model.