Abstract
It is vitally important that a transmission network provides a continuity of electricity to end users and that the transmission system operator prioritizes its safety and reliability. This article presents the possibilities of using multi-track overhead lines with varying levels of rated voltage, run on a common support structure. This solution would ensure safe operation of the system, reduce the area used for the construction of new overhead lines, and, at the same time increase the transmission network capacity. This article focuses on the method of modeling overhead lines for the analysis of electromagnetic transient states that occur during non-simultaneous disturbance phenomena. This article presents the idea of multi-circuit, multi-voltage lines and their validity of use in power systems. An analysis of electromagnetic transient states for non-simultaneous disturbances in multi-path, multi-voltage lines is presented. This analysis has been made on the basis of a network model, using ATP-EMTP (Alternative Transients Program-Electromagnetic Transients Program) software for solutions, for a Polish power system. Particular attention was paid to the most unfavorable phenomena appearing in the modeled system. The impact of the emerging electromagetic transients in multi-path, multi-voltage lines was evaluated. It was shown that the specificity and rapid changeability of the emerging electromagnetic transients and lack of a universal model of the overhead power line make the analyses of electromagnetic transients highly labor-intensive and time-consuming. Each change is connected with the necessity to create new line models for the study of electromagnetic transient states dependent on many factors.
Highlights
Accepted: 28 January 2022For many years, observations have been made of the activities in the widely understood field of power engineering related to satisfying the constantly growing demand for electricity
We present a method of creating a model of the network system for the requirements of the electromagnetic transient analysis with non-simultaneous short-circuit disturbances appearing in overhead lines; in the case of this article, in multi-path lines with varying levels of rated voltage
The increased demand for electricity and the dynamic development of the distribution network have led to a reduction in the margin of transmission capacity for High Voltage (HV) and Extra High Voltage (EHV)
Summary
Observations have been made of the activities in the widely understood field of power engineering related to satisfying the constantly growing demand for electricity. The expectations of the consumer concerning the supply and quality of electricity increases [1]. These requirements are affected by the processes of power sector decentralization and marketization, for which economic criteria are important. Due to the continual progress of network structure decentralization, development of local electricity sources made up of various forms of primary energy, power availability, end user expectations and technical requirements, power system operation must be transformed into a highly dynamic process characterized by a high degree of variety in function and decision-making. Maintaining an appropriate level of flexibility in the management of power system operation is possible by equipping the network and substation structures with properly equipped and coordinated automated control, measurement, connection and protection [2].
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