Due to the growth of renewable resources in electrical power systems, it is essential study and analyze possible events that impact safety system. One these abnormal islanding distributed generators. The consists an isolated operation generators their respective loads, hence, part system disconnected from utility, but still operation. This can bring numerous negative consequences: both for elec...

As the process of deregulation of the electric utility industry proceeds, the importance of power quality is increasing. A fundamental aspect of power quality is the continuity of power supply that is the absence of momentary, temporary and sustained power interruptions. In this paper a network reconfiguration strategy is proposed which allows the distribution network to separate into a certain...

Renewable energy (RE) generation levels are increasing in modern power systems at a fast rate due to their advantages of clean and non-exhaustible nature energy. However, this type creates technical challenges terms operation control uncertain un-predictable generation. Islanding is an operational scenario where there loss grid RE generators continue feed the local load. This has harmful effect...

Contingency analysis (CA) plays a critical role to guarantee operation security in the modern power systems. With the high penetration of renewable energy, a real-time and comprehensive “N-1” CA is needed as a power system analysis tool to ensure system security. In this paper, a graph-based preconditioning conjugate gradient (GPCG) approach is proposed for the nodal parallel computing in “N-1”...

Distributed generation (DG) has reformed the meaning of traditional power from large-scale to small-scale generation. The main issue connecting DG utility grid is detection unintended islanding. This paper shows impact islanding phenomenon in case grid-connected photovoltaic arrays and how develop a convenient technique detect this phenomenon. A passive algorithm proposed for all types DGs by v...

This thesis presents a method of detecting electrical islands in low voltage distributed generator networks by measuring negative sequence impedance differences between islanded and utility connections. Extensive testing was conducted on a commercial building and 25 kV distributed generator fed network by measuring naturally occurring and artificially injected negative sequence components. Simi...

The restoration process of the bulk-power transmission system following a partial or a total blackout, have two main issues during a restoration, those are voltage control and frequency control. Special attention is therefore given to the behaviour of network parameters, control equipments as they affect the voltage and frequency regulation during the restoration process. During restoration due...

This paper presents a novel objective function for distribution system reconfiguration for reliability enhancement. When islanding operations of distributed generators is prohibited, faults in the feeder interrupt the operation of distributed generators. For this reason, we include the customer interruption cost as well as the distributed generator interruption cost in the objective function in...

The concept of traditional distribution networks with unidirectional power flow is weakening due to large penetration of Distributed Generation (DG). The penetration of DG may impact the operation of a distribution network in both beneficial and detrimental ways. Some of the positive impacts of DG are voltage support, power loss reduction, support of ancillary services and improved reliability,...