Abstract
Phase shifting transformers (PSTs) are currently widely used in power systems to control power flow. In this manuscript, the results of the asymmetrical PST (APST) with the in-phase PST (called asymmetrical controllable PST-ACPST) were compared, allowing to control both longitudinal and quadrature voltage. The MATLAB simulation model of the ACPST was built to obtain influence of PST in selected models for selected parameters. Then the 30A laboratory PST device was built in the laboratory. The parameters of the MATLAB model were then adjusted to parameters of the real life PST model. This allowed verifying the results of the real life and computer simulations. Based on the ACPST simulation model, the APST model was built; for the given work conditions, the influence of both PSTs were compared. APST construction always resulted in higher output voltage than the input one. ACPST achieved the same power transfer for the lower output PST voltage, which is its main advantage. This dependency is a result of the greater ACPST angle compared to the classical APST. The ACPST also allowed adjusting longitudinal and quadrature voltages; therefore, this PST type can be installed in places where high flexibility is required, especially in systems with high renewable energy sources penetration.
Highlights
The proposed Asymmetrical Controllable Phase Shifting Transformers (ACPST) allows achieving comparative power transfer while keeping output voltage values in the range limited by the transmission system operator (TSO)
Conventional asymmetrical PST (APST) solutions are compared to the proposed asymmetrical controllable phase shifting transformer (ACPST) and their ability to control power flows in the transmission power lines
Classical APST is, first of all, a cheaper solution, which is essential for the investor
Summary
Phase shifting transformers (PSTs) are some of the key devices used nowadays for power flow control in distribution power supply networks (PSN). In Europe, there are unsolved complications with the power flow control via interconnection lines between two transmission systems operators (two countries). The natural consequence of the construction and operational power systems results in high requirements, concerning reliability in their functioning requirements a high price for each. This paper presents simulations andPST laboratory model for proposed to search for better solutions to improve structure, work,research and control proceduresPST [17]. PST applied to the models of the power systems from two of different structure andlaboratory transformer winding arrangements. Presentation working test, idea simulation of asymmetrical phase shifting transformer; 2.1. 2. with classical asymmetrical phase shifting transformers.
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