Sharif Digital Repository

Harmonic distortions are one of the most important power quality issues in power systems. Nowadays, vast peneteration of the power electronic devices and nonlinear loads, which are the harmonic-producing devices in a network, causes increase in harmonic distortion level in distribution systems, which has negative impacts. The high level of harmonic peneteration in power system can lead to increase in losses and reduction of network equipment’s life. So, system operators have to find and improve some solutions to control the harmonic level. In this way, investigation in harmonic contribution of major nonlinear loads and utilities is a criticl task, specially when a harmonic problem occures.... 

Distribution networks are typically designed in a loop configuration but operate radially. In conventional structure, open tie switches are used to create alternative paths for power supply during faults. A Soft Open Point (SOP) is a multifunctional power electronic device installed at these points in distribution networks, which can enhance network performance under normal operating conditions. Although SOPs can have various structural designs, they are generally implemented as back-to-back voltage source converters. In literature, SOPs are utilized under normal operating conditions to inject active and reactive power between adjacent feeders, improving voltage profiles and reducing losses....