This paper presents a newly developed approach to find the optimal location of distributed generations (DGs) to improve power system voltage stability margin and reduce losses incorporating the constraints. The loadability limit index is used to assess the static voltage stability security margin, which is associated with the point of voltage collapse limit. Based on this, a toolbox is develope...

The increasing need for electrical energy, limited fossil fuel reserves, and the increasing concerns with environmental issues call for fast development in the area of distributed generations (DGs) and renewable energy sources (RESs). A Microgrid (MG) as one of the newest concepts in the power systems consists of several DGs and RESs that provides electrical and heat power for local loads. Incr...

This paper proposes a new reactive-power sharing scheme to reduce the circulating current when two inverter-based distributed generations (DGs) operate in parallel through unequal line impedances in an islanded microgrid. If the terminal voltages of the two DGs are not equal due to the unequal line impedances, a circulating current due to reactive-power unbalance occurs, which increases system ...

This paper presents a robust control scheme for distributed generations (DGs) in islanded mode operation of a microgrid (MG). In this strategy, assuming a dynamic slack bus with constant voltage magnitude and phase angle, nonlinear equations of the MG are solved in the slack-voltage-oriented synchronous reference frame, and the instantaneous active and reactive power reference for the slack bus...

Standalone microgrids, which are mainly constructed on island areas have low system inertia, may result large frequency deviations even for small load change. Moreover, increasing penetration level of renewable energy sources (RESs) into standalone microgrids makes the frequency stability problem even worse. To overcome this problem, this paper proposes an active power sharing method with zero ...

The present study presents the Phasor Discrete Particle Swarm Optimization (PDPSO) algorithm, an effective optimization technique, the multi-dimensional vectors of which consist of magnitudes and phase angles. PDPSO is employed in the configuration of micro-grids. Micro-grids are concepts of distribution system that directly unifies customers and distributed generations (DGs). Micro-grids could...

Reduced rotational inertia in power grids due to increasing penetration levels of distributed generations (DGs) may lead degraded performance the traditional frequency control scheme. In response this challenge, adequacy has recently emerged as a new research area modern systems. Accordingly, an attempt is made paper tackle generation expansion planning (GEP) problem. This turn helps realize su...

Voltage quality is a one of the major concerns in distribution systems. Distributed Generations (DGs) have potential to improve voltage quality, if optimally planned and operated. Considering problem DG siting sizing, this paper aims at integrating technical factors, particularly planning DGs. Hence, methodology proposed which optimizes presence DGs can be used as objectives multi-objective or ...

This paper presents a Cuckoo Search (CS) algorithm-based methodology for simultaneous optimal placement and sizing of Shunt Capacitors (SCs) Distributed Generations (DGs) together in radial distribution systems. The objectives the work are to minimize real power reactive losses while maximizing voltage stability index network subjected equality inequality constraints. Different operational test...

With the development of distributed renewable generations, a large number generations (DGs) are connected to microgrid. Therefore, cooperative algorithms more suitable for optimal dispatch microgrid than centralized algorithms. This paper proposes novel control method microgrids, considering line losses and time delay. First, optimization model is established, optimality conditions obtained. Se...