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 demonstrates the use of a slow coherency based generator grouping algorithm and a graph theoretic approach to form controlled islands as a last resort to prevent cascading outages following large disturbances. The proposed technique is applied to a 30,000-bus, 5000-generator, 2004 summer peak load, Eastern Interconnection data and demonstrated on the August 14, 2003 blackout scenario...

Due to the increasing need to distributed energy resources in power systems, their problems should be studied. One of the main problem of distributed energy resources is unplanned islanding. The unplanned islanding has some dangers to the power systems and the repairman which are works with the incorrect devices. In this paper, a passive local method is proposed. The proposed method is based on...

The phenomenon of feeding loads from any distributed generators (DGs) with a total disconnection utility grid at the point common coupling is called Islanding. DGs are usually independently controlled. Hence, when islanding problem occurs, electric loses control and supervision over that section power grid. Furthermore, prolonged can prevent reconnection to may cause damage due voltage frequenc...

E-mail address: [email protected]; [email protected] Abstract This article presents the development of an optimized droop controller of microgrid during islanding using artificial fish swarm algorithm (AFSA). This is necessary in order to minimize the frequency deviation that occurs when microgrid switches to stand-alone mode or when there are changes or variation in loads. The optimize...

This paper proposes an optimal allocation of phasor measurement unit (PMU) placement model under controlled islanding of power system such that the power network remains observable under controlled islanding condition in addition to normal operation condition. The optimization objective of proposed model is to reduce the number of installed PMUs by using hybrid optimization algorithm. The objec...

This report describes the various methods and circuits that have been developed to detect an islanding condition for photovoltaic applications and presents three methods that have been developed to test those methods and circuits. Passive methods for detecting an islanding condition basically monitor parameters such as voltage and frequency and/or their characteristics and cause the inverter to...

A novel, multistage approach to passive islanding detection is presented which uses a decision-tree-like classification algorithm. The novelty of the proposed method is centered on the way in which features are passed to subsequent stages of the decision tree (DT). A traditional DT uses a single feature set while in the modified algorithm, feature sets extracted using different sized time windo...

Recent developments in power electronics technology have emerged towards the generation of electrical power from the renewable energy sources. Among renewable energy sources, solar energy has garnered more importance because of less maintenance and environmental friendly. In grid connected mode, distributed power generation system (DPGS) requires reliable islanding detection technique to find t...