Abstract
This paper introduces a multifunctional protective system to mitigate more likely threats in power networks. The proposed device can cope with short circuit current, voltage sag, or swell and dangerous overvoltages due to ferroresonance by elaborate switching in its unified structure. The switching is in fact the main key for playing among the functions and altering the structure. Since the switches receive the control system’s commands based on what happens in the network, an intelligent controller has to be designed to interpret four operating modes and activate the correct function. Following the activation command, the structure is customized through switching action and the network is equipped with the corresponding protection function. The proposed scheme by employing minimum components and therefore achieving significant saving in costs can meet all expectations satisfactorily. Moreover, the control system’s performance is examined by a set of numerical simulations in a Matlab/Simulink environment. The obtained results show that the proposed device is feasible and successfully performs all three functions independently.
Highlights
Today, the widespread use of nonlinear loads has increased the risk of instability and reduced the reliability and quality of power systems [1,2,3]
One problem with nonlinear loads is the unpredictability of their behavior, which causes the system to experience voltage or current faults. ese faults including short circuit current, ferroresonance overvoltage, and voltage sag/swell are the major cause of damage to the consumer and energy producer, which can deteriorate the insulation of the distribution network equipment and the consumer, and reduce the quality of power supply by voltage drop, voltage rise, or voltage imbalances [4, 5]
Some questions may be raised, for instance, is a high speed multi task protection system with minimum components and cost feasible? or is it possible to decrease the complexity of the design while its efficiency and reliability are kept constant? Many researches have been carried out to give a suitable answer to such questions in the literature
Summary
The widespread use of nonlinear loads has increased the risk of instability and reduced the reliability and quality of power systems [1,2,3]. Fault current limiting and dynamic voltage recovery are two different functions and are managed independently, several components with some technology can be used to combine them intelligently Another nonlinear phenomenon in the network is ferroresonance overvoltage, which can occur between the breaker’s capacitor and the voltage transformer [24]. Is paper introduces a structure of a unified multifunctional protective system that can cope with power quality pollution, manage heavy short-circuit currents, and limit ferroresonance overvoltage.
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