HGAPSO based Method for Solving Unit Commitment Problem

Authors: Mohammad Reza Salimian, Mohammad Taghi Ameli

Abstract

The production cost of generators could be minimized by optimizing the schedule of generation. Unit commitment problem is used for scheduling the generation. In this paper, Hybrid genetic Algorithm and PSO (HGAPSO) is used for solving unit commitment problem. In fitness function, all constraints of unit commitment problem are satisfied without using penalty function. The proposed method is tested on ten generator test system. At the end, the results obtained from HGAPSO are compared with the results of other methods.

Index Terms

Unit Commitment, Hybrid genetic Algorithm and PSO, Optimization, Production Cost

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HGAPSO based Method for Solving Unit Commitment Problem

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Global Solar Energy: A Review

Authors: Ashish Kumar Singhal , Neha Yadav,N.S. Beniwal


Abstract

As view of recent trend in Electricity, Our world is facing the problem in electricity due to lacking of fossil fuels. We need to reduce greenhouse gasses emission, have made renewable resources attractive in world energy based economies. The potential for renewable energy resources is enormous. In principle, exponentially exceed the world’s energy demand. Therefore, these types of resources will have a great development in the future global energy portfolio, much of which is now concentrating on advancing their pool of solar energy resources. This paper presents how solar energy is currently used in across the globe.

Index Terms

Solar energy, their type, demands of energy in the world and their availability

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Global Solar Energy: A Review

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A Novel Phase Shifted DC-DC Converter with Adaptive Soft Switching to Improve Efficiency under wide Load Range

Authors: Sudha Bansal,   Lalit Mohan Saini


Abstract

This paper presents a novel dc-dc converter with adaptive soft switching as a means to achieve ZVS operation for all the switches. It adopts phase shift modulation features for constant frequency operation and adaptive soft switching at low load. To accomplish this task two loops are employed; inner current control loop is to check the loading condition and turn on of auxiliary switch accordingly. Outer control loop is used to improve the dynamic performance of DC-DC converter by achieving a robust output voltage against load disturbances. This paper also presents the performance of various controllers. A 1kW/100KHz dc/dc converter is simulated and analyzed. Performance of the proposed topology is evaluated at different loads i.e. static and dynamic load (DC motor). An efficiency comparison of the converter with a reported topology has also been carried out.

Index Terms

DC-DC converter; phase-shifted; resonant tank; reverse recovery; resonant converter; Soft switching

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A Novel Phase Shifted DC-DC Converter with Adaptive Soft Switching to Improve Efficiency under wide Load Range 

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Reference Signal Limiter in the Control of Buck Power Converters with Improved Stability

Authors: Prasanth Sai, M. Narendra Kumar, S. Sunisith

Abstract

This paper presents the solution for controlling the dc-dc switched power of Buck type converter. This technique states that the control signal can take the values in the range (0, 1) only. Such a control limitation is generally not considered into account when designing the converter regulators. This is only dealt with in the control implementation stage, placing a limiter (controls the range of input signal) between the controller and the controlled system. In this, the control signal limitation is provided by using a non-linear regulator that consists of an internal limiter. The final closed-loop control system is nothing but the non-linear feedback involving a linear dynamics block in closed-loop with a non-linear static element. If these conditions are satisfied when choosing the control design parameters then the regulator improves closed-loop stability and output reference tracking.

Index Terms

Buck Converters, Reference Signal Limiter, Switched Power Converter.

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Reference Signal Limiter in the Control of Buck Power Converters with Improved Stability

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Performance of 30 Bus System with Thyristor Controlled Inter Phase Controller

Authors: V. Satyanarayana Rao R, S Rama Reddy

Abstract

Environmental, regulatory and economic constraints have restricted the growth of electric power transmission facilities, and the topologies to enlarge the levels of power transmission and enhance stability through existing transmission lines have become greatly needed. Many approaches have been proposed for solving the stability problems found in power system operations. Considering the diversity of both, the solutions and the problems, it is often difficult to identify the most suitable solution. The main purpose of this paper is to demonstrate the capability of Inter Phase Power Flow (IPC) Controller as a means for stability improvement in power systems. In this paper 30 bus system is used as a test bed and the results are shown with and without TC-IPC. The results indicate the power quality improvement of this Flexible AC Transmission System (FACTS) controller in thirty bus system.

Index Terms

Controlled Series Compensator (CSC), Eight Bus System, Flexible AC transmission system (FACTS), Interphase power controller, Static phase shifting transformer, TC-IPC, UPFC.

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Performance of 30 Bus System with Thyristor Controlled Inter Phase Controller

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Support Vector Machines and Artificial Neural Networks for Identification of Residence Time Distribution Signals

Authors : H. Kasban, H. Arafa , S. M. S. Elaraby  , O. Zahran, M. El-Kordy and F. E. Abd El-Samie


Abstract

This paper presents a practical comparison between the Support Vector Machines (SVMs) and the Artificial Neural Networks (ANNs) as identifiers for the Residence Time Distribution (RTD) signal identification. In these identifiers, the cepstral features are extracted from the signal or from its power density spectrum (PDS) estimated using eigenvector method, or from the Discrete Cosine Transform (DCT), then the extracted features feed the identifiers. Both identifiers have been tested using the same RTD signals. The performance of these identifiers is evaluated in the presence of different types of noise. The simulation results proved that, the ANNs based identifier is more reliable in RTD signal identification, but it takes more time with respect to the SVMs based identifier.

Index Terms

Support Vector Machines, Artificial Neural Networks, Residence Time Distribution

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Support Vector Machines and Artificial Neural Networks for Identification of Residence Time Distribution Signals

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Minimum Cost Analysis in Radial Distribution System Planning Using Genetic Algorithm

Authors: El-zein ,E. Safie El-din

Abstract

This paper introduces a new feeder branching technique using Genetic Algorithm (GA)  to obtain the best location of distribution substation and the optimal feeder routing. This technique aims at achieving minimum cost and voltage drop constraint. To confirm the ability of this technique to find the optimal solution of the general planning  problem, the proposed algorithm is applied on two cases: The first case is 25 load points dispersed in a region of 30×20 km2 have to be fed by a 20kv substation and the second case is 104 load points dispersed in a region of 18×15 km2 have to be fed by a 11kv substation. the location and the apparent power of each load point are pre-known.

 

Index Terms

Radial system, distribution planning, geographic information systems (GIS), feeder routing, substation location, Genetic Algorithm.

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Minimum Cost Analysis in Radial Distribution System Planning Using Genetic Algorithm 

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Control of Chaos in Positive Output Luo Converter by means of Time Delay Feedback

Authors:Nagulapati Kiran

Abstract

Faster development in Dc to Dc converter techniques are undergoing very drastic changes due to that major advancements like low voltage, high power density in electronic industry. Chaos is a kind of quasi-stochastic behaviors of determinate nonlinear system. It is a non-linear phenomenon specifically found in all non-linear systems. The dc-dc converters exhibit a wide range of bifurcation and chaotic behavior under certain operating conditions. This paper analyses the behavior of Luo converter under current control mode. As the reference current is increased, the system becomes unstable to chaos. This is shown by means of bifurcation diagram. This is stabilized by means of time delayed feedback control method. The simulation is done using PSIM.

Index Terms

Chaos, Bifurcation, Positive Output Luo Converter,Time Delayed Feedback Control

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Control of Chaos in Positive Output Luo Converter by means of  Time Delay Feedback 

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Optimal Reactive Power Planning for Loss Reduction and Improvement of Voltage Profile Using Cuckoo Search Algorithm

Authors: K.R.VADIVELU , G.V. MARUTHESWAR

Abstract

This paper proposes an application of Fast Voltage Stability Index (FVSI) to Reactive Power Planning (RPP) using Cuckoo Search Algorithm (CSA). FVSI is used to identify the weak buses for the Reactive Power Planning problem which involves process of experimental by voltage stability analysis based on the load variation. The point at which Fast Voltage Stability Index close to unity indicates the maximum possible connected load and the bus with minimum connected load is identified as the weakest bus at the point of bifurcation. The proposed approach has been used in the IEEE 30-bus system.  Results show considerable reduction in system losses and improvement of voltage stability with the use of Fast Voltage Stability Index for the Reactive Power Planning problem.

Index Terms

Power systems, Reactive Power Planning, Fast Voltage Stability Index, Differential Evolution

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Optimal Reactive Power Planning for Loss Reduction and Improvement of Voltage Profile Using Cuckoo Search Algorithm

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Simulation Design, Control and Analysis of Induction Motor based AC Chopper

Authors: Cholleti Sriram, Voraganti David, Janardhan Rao

Abstract

To use the induction motor for various applications, controlling of speed is necessary. By having different speed control techniques of induction motor, stator voltage control is the only speed control technique which it can vary the voltage keeping supply frequency as constant at the input side of the motor, it can be provided by AC Chopper. By varying the stator voltage using ON-OFF control PWM technique of AC chopper, the control of speed of an induction motor is achieved. This paper proposes a stator voltage speed control technique of induction motor based AC chopper. This paper also discusses the simulation design, control and analysis of induction motor by using electro dynamics equations with the help of Simulink/MATLAB.  

Index Terms

Stator Voltage Control, Induction Motor, AC Chopper, ON-OFF control, PID Control

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Simulation Design, Control and Analysis of Induction Motor based AC Chopper 

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