Study on Voltage Unbalance Improvement Using SFCL in matlab simulation

Study on Voltage Unbalance Improvement Using SFCL in matlab simulation l Electrical project



An electric railway system uses a single-phase source that is supplied through a Scott transformer from a three-phase transmission system. In addition, the electric railway system has rapidly changing load characteristics in time. An unbalance is generated owing to the rapidly changing large single-phase loads. Subsequently, the unbalanced load causes an unbalanced transmission line. A voltage unbalance in the source influences the power equipment by causing a reduction in the power generation capacity of the generator and a decrease in the output of the other facilities in the transmission line. In addition, many flexible ac transmission systems are applied to transmission lines to compensate for and control electric power. A voltage unbalance causes a control error in these systems. We propose the application of a superconducting fault current limiter to improve the voltage unbalance in a transmission system linked to a Scott transformer. In addition, we analyzed the effects of the proposed method using transient simulations.
Recently electric railway systems have gained great interest owing to depletion of fossil fuels and limits on carbon emissions to prevent global warming. The use of an electric railway causes a large-scale load owing to demand increase and performance improvement [1]. This system uses a single-phase source supplied through a Scott transformer from a 3-phase transmission system and has rapidly changing load characteristics in time. These characteristics can cause voltage unbalances [2], [3]. From the utility viewpoint, single-phase loads that cause voltage unbalances in the transmission line are constantly being increased.
In response to the unbalances, flexible AC transmission systems (FACTs) are applied to control transmission system power flow and to improve system stability. A thyristor-controlled series capacitor (TCSC) is one of the practical devices that can improve the implementation of FACTs [4]. Actual line voltage and current information is quite important TCSC control scheme. However, voltage and current unbalance produced by an electric railway load causes serious TCSC control errors.
This problem can influence system stability. In particular, a voltage and current unbalances after fault will cause further problems. The remainder of this paper is organized as follows. Section II details a transmission line with a TCSC system and unbalanced loads in an electric railway system. In Section III, faults in the transmission line with a TCSC system and electric railway are analyzed using SFCL modeling. In Section IV, a method is proposed for improving the transmission line using SFCL.
The basic applications of FACTS-devices are:
• Power flow control,
• Increase of transmission capability,
• Voltage control,
• Reactive power compensation,
• Stability improvement,
• Power quality improvement,
• Power conditioning,
• Flicker mitigation,
• Interconnection of renewable and distributed generation and storages. 

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