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This paper proposes a maximum power point tracking scheme using neural networks for a grid connected photovoltaic system. The system is composed of a photovoltaic array, a boost converter, a three phase inverter and grid. The neural network proposed can predict the required terminal voltage of the array in order to obtain maximum power. The duty cycle is calculated and the boost converter switches...
This paper proposes an efficient solution to the problem of power flow tracing in electrical transmission networks. In a competitive-market environment, deregulation of the electricity industry and thus transmission open access make it even more important to allocate the cost of transmission service fairly. Graph method and the proportional-sharing principle are employed to trace power flow; the results...
The advent of rising electrical energy consumption gave rise to a steady increase in the demand on power generation. So, in addition to conventional power generation units a number of renewable energy units are increasingly being integrated into the system. A wind electrical generation system is the most cost competitive of all the environmentally clean and safe renewable energy sources in world....
This paper proposes a control strategy of generating a rotor flux amplitude reference for Doubly Fed Induction Machine (DFIM) based wind turbines. In addition to that a Direct Torque Control (DTC) strategy that provides fast dynamic response accompanies the overall control of the wind turbine. It is specially designed to address perturbations, such as voltage dips, keeping controlled the torque of...
Dibenzyl Disulfide (DBDS) is one of several sulfur compounds known to cause copper corrosion in transformers. Breakdown of the DBDS to benzyl mercaptan or a DBDS-Copper complex can still cause corrosion of copper and the formation of copper sulfide. The primary effect of the presence of corrosive sulfur species in insulating oil is the formation of copper sulfide (Cu2S) on the surface of copper conductors...
An interval type-2 fuzzy logic controller (IT2FLC) is proposed in this paper for the design of power system stabilizer (PSS) applied for both single machine infinite bus (SMIB) and multi machine system incorporated with an AC1A exciter. For controller design, membership functions of system variables are represented using interval value fuzzy sets. Fuzzy logic based on interval value sets is capable...
This paper describes an approach for modelling of automatic voltage regulator using the forward/backward sweep-based algorithms for unbalanced radial distribution systems. Power loss indices are first found at each branch except source bus and the bus that has the highest power loss index are picked as the best location for the voltage regulators placement. To obtain the tap position of the voltage...
This paper focus on switching pattern selection scheme based cascaded multilevel inverter fed induction motor drive. It offer several advantages compared to the conventional 3-phase bridge inverter in terms of lower dv/dt stresses, lower electromagnetic compatibility, smaller rating and better output features. The proposed method has been designed an eleven-level cascaded multilevel inverter by using...
This paper reports a sensorless control technique for a Brushless DC (BLDC) motor based on an improved sliding mode observer, where a signum function is replaced by sigmoid function. Conventional sliding mode observer use signum function as the switching function which leads to chattering in the estimated back EMF. A low pass filter (LPF) is used to eliminate the chattering problem which indeed produces...
Distributed generation (DG) is an emerging concept in the electricity sector, which represents good alternatives for electricity supply instead of the traditional centralized power generation concept. Distributed generation (DG) has been utilized in some electric power networks. Power loss reduction, environmental friendliness, voltage improvement, postponement of system upgrading, and increasing...
This paper presents the use of multi-line flexible alternating current transmission systems (FACTS) device which is interline power flow controller(IPFC) for power system security enhancement by reducing number of overloaded lines and voltage violation buses. The security constrained optimal power flow (SCOPF) problem with IPFC is solved using proposed algorithm known as intelligent search evolution...
Almost every electrical equipment is provided with insulation. The quality of insulation is very important factor in deciding the life of the equipment. Different methods had been used for assessing the quality of insulation under various conditions. Partial discharge (PD) test is one among the most important tests for assessment of insulation quality. In the paper, analysis of partial discharge is...
Wind speed distribution analysis is essential for assessment of the wind energy potential and also performance of wind energy conversion system. Two-parameter Weibull is the commonly used Probability density function (PDF) to model wind speed distribution. Conventionally method of maximum likelihood (MLE) and method of moments (MOM) methods are used for parameter estimation. In this paper Artificial...
With increasing research on the field of alternative energy resources for sustainable development, more renewable energy sources are getting penetrated to the distributed network to form “microgrid”. This leads to more complexity in the distribution network in terms of energy management and realtime control. The objective of this paper is to design a system that forecasts the short (daily), medium...
In this paper, the unity power factor isolated three phase rectifier based on the Scott transformer is analyzed. This topology presents a Scott transformer for galvanic isolation and uses instantaneous current control. The various current control schemes like PI control, Hysteresis control and One cycle control are tested. The use of the Scott transformer makes a split dc-bus voltage possible and...
This These Mobile operators of Bangladesh are experiencing a fast growth of consumer market which has made it one of the highest growing areas of business. Power failure is a serious problem which the mobile operators are facing frequently and Diesel Generators (DG) are the common mean to tackle this problem. But constant increase of fuel price is a big concern for optimum operation of telecom Base...
This paper presents application of fuzzy set theory and interval arithmetic for computing the branch currents, node voltages. First load currents at every node are estimated based on hourly load pattern of different types of consumers using fuzzy set theory. Once the fuzzy load currents at each node are estimated, then by using forward path information matrix the branch currents are computed using...
Microgrid is defined as the cluster of multiple distributed generators (DGs) such as renewable energy sources that supply electrical energy. The connection of microgrid is in parallel with the main grid. When microgrid is isolated from remainder of the utility system, it is said to be in intentional islanding mode. In this mode, DG inverter system operates in voltage control mode to provide constant...
This paper investigates the application of a Dynamic Voltage Restorer (DVR) to assist a wind turbine driven doubly-fed induction generator (DFIG) for uninterrupted power supply to the connected grid even under unbalanced grid voltage conditions. The DVR control is based on symmetrical components and vector control. Rotor Side Converter (RSC) is controlled to maintain stator active power and reactive...
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