Informatics Publishing Limited

S. Baskar ¹, N. Kumarappan ¹, R. Gnanadass ²

Affiliations
1 Dept. of EEE, Annamalai University, Chidambaram, IN
2 Dept. of EEE, Pondicherry Engineering College, Puducherry, IN

Abstract

To investigate the capability of regulating power flow in Single Machine Infinite bus system using Unified Power Flow Controller (UPFC) is the main focus of this paper. This paper presents the dynamic operational characteristics of Unified Power Flow Controller using switching level model. The real & reactive power flow is controlled by varying the shunt converter firing angle and modulation index of the series converter. The simulation is carried out in Simulink based MATLAB environment. The simulation result proves that the UPFC makes the power factor of the system is unity and the total harmonic distortion of line voltage are effectively minimized. The proposed controller shows the good performance & effectiveness of controlling the real and reactive power and also damping the oscillation due to system faults.

Keywords

Linear Firing Angle Control, Single Machine Infinite Bus System, Switching Level Modeling, Unified Power Flow Controller.

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K. Suresh ¹, N. Kumarappan ²

Affiliations
1 Department of Electrical and Electronic Engineering, Sri Manakula Vinayagar Engineering College, IN
2 Department of Electrical Engineering, Annamalai University, IN

Abstract

This paper presents a methodology for maintenance scheduling (MS) of generators using binary particle swarm optimization (BPSO) based probabilistic approach. The objective of this paper is to reduce the loss of load probability (LOLP) for a power system. The capacity outage probability table (COPT) is the initial step in creating maintenance schedule using the probabilistic levelized risk method. This paper proposes BPSO method which is used to construct the COPT. In order to mitigate the effects of probabilistic levelized risk method, BPSO based probabilistic levelized risk method is embarked on a MS problem. In order to validate the effectiveness of the proposed algorithm, case study results for simple five unit system can accomplish a significant levelization in the reliability indices that make possible to evaluate system generation system adequacy in the MS horizon of the power system. The proposed method shows better performance compared with other optimization methods and conventional method with improved search performance.

Keywords

Maintenance Scheduling, Probabilistic Levelized Risk Method, Binary Particle Swarm Optimization, Capacity Outage Probability Table.

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R. Ashok Bakkiyaraj ¹, N. Kumarappan ¹

Affiliations
1 Department of Electrical Engineering, Annamalai University, IN

Abstract

This paper presents a new approach for state adequacy evaluation of sampled system state in composite power system reliability analysis. Generalized regression neural network (GRNN) is used in conjunction with non-sequential Monte Carlo simulation (MCS) to evaluate the loss of probability and the power indices. GRNN approach predicts the test functions for all the sampled states after sufficient training patterns are obtained in the initial MCS sampling with dc load flow based load curtailment minimization model. This model predicts the test functions for both success and failure states. The sampled system states are used to evaluate annualized system and load point indices. The indices evaluated are loss of load probability, loss of load expectation, expected demand not served and expected energy not supplied. The results obtained in this approach are compared with the conventional non-sequential MCS which uses load curtailment minimization model for state adequacy evaluation. An error analysis for different reliability levels is also carried out to check applicability of GRNN approach for calculating the test functions in reliability optimization, where several reliability levels are analyzed. The application of the proposed GRNN approach is illustrated through case studies carried out using RBTS and IEEE-RTS test systems and annualized indices are presented. It is found that the proposed approach estimates indices nearer to the conventional non-sequential MCS.

Keywords

Generalized Regression Neural Network, Composite Power System, State Adequacy Evaluation, Reliability Indices, DC Load Flow Based Load Curtailment Model.

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S. Anbazhagan ¹, N. Kumarappan ¹

Affiliations
1 Department of Electrical Engineering, Annamalai University, IN

Abstract

There is a general consensus that the movement of electricity price is crucial for electricity market. The binary electricity price classification method is as an alternative to numerical electricity price forecasting due to high forecasting errors in various approaches. This paper proposes a binary classification of day-ahead electricity prices that could be realized using discrete cosine transforms (DCT) based neural network (NN) approach (DCT-NN). These electricity price classifications are important because all market participants do not to know the exact value of future prices in their decision-making process. In this paper, classifications of electricity market prices with respect to pre-specified electricity price threshold are used. In this proposed approach, all time series (historical price series) are transformed from time domain to frequency domain using DCT. These discriminative spectral co-efficient forms the set of input features and are classified using NN. The binary classification NN and the proposed DCT-NN were developed and compared to check the performance. The simulation results show that the proposed method provides a better and efficient method for day-ahead deregulated electricity market of mainland Spain.

Keywords

Price Forecasting, Discrete Cosine Transforms, Neural Network, Binary Electricity Price Classification, Electricity Market.

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S. Arunkumar ¹, V. Vijay Anand ¹, N. Kumarappan ², V. Suveetha ², B. Toziba ², T. Vignesh ²

Affiliations
1 SOM, SASTRA University, Thanjavur - 613401, Tamil Nadu, IN
2 School of Civil Engineering, SASTRA University, Thanjavur - 613401, Tamil Nadu, IN

Abstract

Objectives: To study the demographic profile of the construction laborers working in rural and urban areas of Tanjore district, to find out the significant factors which influences the safety and health practices in the construction sites as per the perception of laborers (Construction site workers) and to provide suggestive strategies to raise the level of awareness of the significance of safety and health practices at the construction sites. Methods/Analysis: The population of study deals with the construction workers who work in selected construction sites located in the rural areas of Tanjore district.The study adopted the non-probability convenient sampling. The schedule was self- administered to 132 respondents with the help of the researcher.The data were subject to reliability analysis to check the internal consistency and validity test such as content validity & face validity were applied. The data were analyzed using percentage analysis to depict the demographic profile and specific statistical tools used for the analysis was multiple regression analysis for determining the overall satisfaction level of construction workers. SPSS version 16 was used for data anlaysis. Findings: The research study reveals that the significant factors responsible for the safety and health practices are lack of first aid training program, the firm pressurizes workers to complete the work beyond their limits, the workers feel nervous and mental phobia when working under high altitude, safety net not provided for scaffolding, lack of temporary railings for staircases, caution and reflector are not provided to denote the sign of danger. Applications/Improvement: The study provides some suggestive strategies to enhance the safety performance level and the study need to add more items related to safety measures and test the instrument with more samples both in rural and urban areas.

Keywords

Awareness, Construction Sites, Laborers, Rural Areas, Safety, Training.

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