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Double-fed induction generators is introduced as the dominant generator in comparison with synchronous generators. With increased production capacity in wind farms their role in power system stability has become important. Inertia response is the first reaction of the generator to the frequency disturbance in power system. Synchronous generators have a high inertia response but DFIG has a very low...
This study presents a binary particle swarm optimization (BPSO) based methodology for the optimal placement of phasor measurement units (PMUs) when using a mixed measurement set. The optimal PMU placement problem is formulated to minimize the number of PMUs installation subject to full network observability and to maximize the measurement redundancy at the power system buses. In order to ensure full...
In this paper we introduce an approach for solving the state equations of a helical flux compression generators. These state equations are obtained from 2-dimensional filamentary model of helical flux compression generators. Firstly, we derivate the matrix representation of differential equations of the heliacal flux compression generator. Then with selection of the appropriate state vector, the state...
Series FACTS devices have been successfully used for many years in order to enhance the stability and loadability of high voltage transmission networks. The principle is to compensate the inductive voltage drop in the line by an inserted capacitive voltage or in other words to reduce the effective reactance of the transmission line to enhance available transfer capability (ATC) in the network. ATC...
This paper presents a method for optimal sitting and sizing of distributed generation (DG) in distribution systems. In this paper, our aim would be optimal distributed generation allocation and sizing for voltage profile improvement, loss reduction, and THD (total harmonic distortion) reduction in distribution networks. Particle swarm optimization (PSO) is used as the solving tool, which referring...
In this paper we present an approach to calculate the time varying equivalent inductance and resistance of the helical flux compression generators accurately. This approach is based on the 2-D filamentary method and using dynamic matrix concept. By using this method, we can consider both the effects of the armature presence and frequency on the inductance and resistance of the HFCGs. The latter effect...
However, direct torque control (DTC), over years, is known to provide high dynamic performance and also fast and robust response for induction motors (IM), classical DTC produces notable torque, flux ripples. In the present paper, fuzzy logic has been suggested to improve the system performance (i.e. gives faster torque and flux responses and also reducing the undesirable torque ripple that can occur...
In Iran, restructuring and privatization in electricity network are in progress. Government planned to double the generation and transmission capacities up to year 2015. It is assumed that distribution generations (DGs) will have a significant influence on network future topology. For approaching such aim a new organization in the Ministry of Energy called "Renewable Energies Organization"...
This paper presents a method for the optimal allocation of Distributed generation in distribution systems. In this paper, our aim would be optimal distributed generation allocation for voltage profile improvement and loss reduction in distribution network. Genetic Algorithm (GA) was used as the solving tool, which referring two determined aim; the problem is defined and objective function is introduced...
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