Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156651
B. Saravanan, K. Swarup, D. Kothari
This paper gives a solution for the unit commitment problem (UCP) for an power system to minimize the total production cost over a period of time by considering the load as a random(Probabilistic) variable instead of a deterministic one. The UCP is a mixed integer large scale non linear program. If the number of unit is more and the time horizon is large, then the analysis become more complex. That is the reason still researches are active in finding the solution for unit commitment problem. In this paper the proposed methodology by considering the load as a probabilistic variable instead of regular deterministic one. By considering the load in this way we can solve the problem of UCP as a real time problem. In the proposed methodology LR method is used to separate the problem in to a primal and dual problem and each sub-problem is solved by using dynamic programming. The economic dispatch problem is solved by particle swarm optimization. By comparing the results with conventional method the proposed methodology gives the schedule of generator with minimum production cost.
{"title":"A solution to unit commitment problem by considering load to be a probabilistic one","authors":"B. Saravanan, K. Swarup, D. Kothari","doi":"10.1109/ICPES.2011.6156651","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156651","url":null,"abstract":"This paper gives a solution for the unit commitment problem (UCP) for an power system to minimize the total production cost over a period of time by considering the load as a random(Probabilistic) variable instead of a deterministic one. The UCP is a mixed integer large scale non linear program. If the number of unit is more and the time horizon is large, then the analysis become more complex. That is the reason still researches are active in finding the solution for unit commitment problem. In this paper the proposed methodology by considering the load as a probabilistic variable instead of regular deterministic one. By considering the load in this way we can solve the problem of UCP as a real time problem. In the proposed methodology LR method is used to separate the problem in to a primal and dual problem and each sub-problem is solved by using dynamic programming. The economic dispatch problem is solved by particle swarm optimization. By comparing the results with conventional method the proposed methodology gives the schedule of generator with minimum production cost.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121982014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156673
P. Karuppanan, K. Mahapatra, K. Jeyaraman, J. Viji
This paper presents a Fryze power theory based three-phase, three-wire Active Power Line Conditioner (APLC) for power quality enhancement. The shunt APLC system is used for harmonics and reactive power compensation due to non-linear loads. The compensation control strategy is proposed on active and non-active power in the time domain based generalized Fryze currents minimization theory. PWM-voltage source inverter based active power filter gate control switching signals are brought out from adaptive-Hysteresis Current Controller (HCC). This Fryze power theory method maintains the capacitance voltage of the inverter constant without any additional controller circuit. The shunt APLC system is investigated using extensive simulation studies and the performance parameters are obtained under different steady state and transient conditions. A comparative assessment of fixed-HCC and adaptive-HCC are carried out.
{"title":"Fryze power theory with adaptive-HCC based active power line conditioners","authors":"P. Karuppanan, K. Mahapatra, K. Jeyaraman, J. Viji","doi":"10.1109/ICPES.2011.6156673","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156673","url":null,"abstract":"This paper presents a Fryze power theory based three-phase, three-wire Active Power Line Conditioner (APLC) for power quality enhancement. The shunt APLC system is used for harmonics and reactive power compensation due to non-linear loads. The compensation control strategy is proposed on active and non-active power in the time domain based generalized Fryze currents minimization theory. PWM-voltage source inverter based active power filter gate control switching signals are brought out from adaptive-Hysteresis Current Controller (HCC). This Fryze power theory method maintains the capacitance voltage of the inverter constant without any additional controller circuit. The shunt APLC system is investigated using extensive simulation studies and the performance parameters are obtained under different steady state and transient conditions. A comparative assessment of fixed-HCC and adaptive-HCC are carried out.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127162419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156625
S. Subramanian, J. K. Chatterjee, V. Rajasekhar, Adapa Kondalarao
A technique has been presented for reducing the injection of harmonic current into the grid for matrix converter controlled induction generator, for application in wind energy conversion systems. A composite arrangement has been proposed where, multiple matrix converter controlled induction generators are kept in parallel and connected to the grid with appropriate phase shifting transformers that help in reducing the grid current harmonics. This technique of harmonic reduction with minimal use of the filter component will have an enormous impact in cases like wind farms having multiple generating units.
{"title":"Reduction of grid current harmonic injection in matrix converter controlled induction generator for wind applications","authors":"S. Subramanian, J. K. Chatterjee, V. Rajasekhar, Adapa Kondalarao","doi":"10.1109/ICPES.2011.6156625","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156625","url":null,"abstract":"A technique has been presented for reducing the injection of harmonic current into the grid for matrix converter controlled induction generator, for application in wind energy conversion systems. A composite arrangement has been proposed where, multiple matrix converter controlled induction generators are kept in parallel and connected to the grid with appropriate phase shifting transformers that help in reducing the grid current harmonics. This technique of harmonic reduction with minimal use of the filter component will have an enormous impact in cases like wind farms having multiple generating units.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129969575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156682
J. K. Chatterjee, S. Subramanian, D. Bharat, Sudeshna Das
Present work aims to improve the dynamic response and reliability of Shunt Hybrid Active Filter (SHAF) configuration using improved methods of harmonic detection. A method of introduction of only “positive inductance” through an active filter for mistuned conditions of the passive filter has been presented. “PLL free” scheme of harmonic detection for an uncontrolled rectifier type of non linear load has been studied. Intense simulation studies are carried out using MATLAB/Simulink to validate the functioning of the developed techniques under all conditions of operation. Experimental implementation of the proposed strategy using Digital Signal Processor TMS320F2812 processor is also presented.
{"title":"Performance improvement in selective harmonic compensation of Shunt Hybrid Active Filter","authors":"J. K. Chatterjee, S. Subramanian, D. Bharat, Sudeshna Das","doi":"10.1109/ICPES.2011.6156682","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156682","url":null,"abstract":"Present work aims to improve the dynamic response and reliability of Shunt Hybrid Active Filter (SHAF) configuration using improved methods of harmonic detection. A method of introduction of only “positive inductance” through an active filter for mistuned conditions of the passive filter has been presented. “PLL free” scheme of harmonic detection for an uncontrolled rectifier type of non linear load has been studied. Intense simulation studies are carried out using MATLAB/Simulink to validate the functioning of the developed techniques under all conditions of operation. Experimental implementation of the proposed strategy using Digital Signal Processor TMS320F2812 processor is also presented.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126027848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156691
K. Mitobe, Masafumi Suzuki, N. Yoshimura
Ion migration that causes short circuit to an insulated printed wiring board (PWB) occurs in highly humid environment under electrical field. In this paper, water drop test (WDT) method was used as an acceleration test of ion migration. We have investigated the dendrite using three different bands of electromagnetic wave, x-ray, visible light and THz wave. As the results, THz imaging system is superior to find the dendrite because the deposited metal has highly reflectance against the THz wave.
在电场作用下的高湿度环境中，离子迁移会导致绝缘印制板(PWB)短路。本文采用水滴试验(water drop test, WDT)法作为离子迁移的加速试验。我们用三个不同波段的电磁波，x射线，可见光和太赫兹波来研究树突。结果表明，由于沉积金属对太赫兹波的高反射率，太赫兹成像系统在寻找枝晶方面具有优势。
{"title":"Analysis of the dendrite on printed wiring board by soft X-ray microscope and THz imaging: Structure of the dendrite in Ion-migration","authors":"K. Mitobe, Masafumi Suzuki, N. Yoshimura","doi":"10.1109/ICPES.2011.6156691","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156691","url":null,"abstract":"Ion migration that causes short circuit to an insulated printed wiring board (PWB) occurs in highly humid environment under electrical field. In this paper, water drop test (WDT) method was used as an acceleration test of ion migration. We have investigated the dendrite using three different bands of electromagnetic wave, x-ray, visible light and THz wave. As the results, THz imaging system is superior to find the dendrite because the deposited metal has highly reflectance against the THz wave.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125099248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156649
U. Mujumdar, J. Joshi
For systems with non sinusoidal voltage and current, reactive power calculation using conventional power triangle method is the summation of displacement and distortion reactive power. Under such condition, attempt to make power factor unity, using shunt compensator, overcompensates the system and excess capacitor effectively increases the system current which is not desirable. In this paper, a new method for reactive power compensation using passive components is presented. The proposed approach is based on current minimization and does not need any reactive power definition for compensation. Reactive power demand of the load is calculated in terms of desired shunt capacitor current, using addition of test capacitor in the system. Capacitive current required to minimize the circuit current is calculated from the measured values of change in circuit current and test capacitor current. Mathematical equations are developed for the computation of compensation capacitor under sinusoidal as well as non sinusoidal conditions. The method has been validated by testing under various load conditions with an experimental prototype developed using 8 bit microcontroller ATMega32.
{"title":"Optimal reactive power compensation under non sinusoidal conditions using current minimization method","authors":"U. Mujumdar, J. Joshi","doi":"10.1109/ICPES.2011.6156649","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156649","url":null,"abstract":"For systems with non sinusoidal voltage and current, reactive power calculation using conventional power triangle method is the summation of displacement and distortion reactive power. Under such condition, attempt to make power factor unity, using shunt compensator, overcompensates the system and excess capacitor effectively increases the system current which is not desirable. In this paper, a new method for reactive power compensation using passive components is presented. The proposed approach is based on current minimization and does not need any reactive power definition for compensation. Reactive power demand of the load is calculated in terms of desired shunt capacitor current, using addition of test capacitor in the system. Capacitive current required to minimize the circuit current is calculated from the measured values of change in circuit current and test capacitor current. Mathematical equations are developed for the computation of compensation capacitor under sinusoidal as well as non sinusoidal conditions. The method has been validated by testing under various load conditions with an experimental prototype developed using 8 bit microcontroller ATMega32.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133038659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156640
K. Chandrasekaran, G. S. Punekar
Lightning generated horizontal electric field above the ground have been computed and reported for a typical height of 10 m (above the ground plane), at a radial distance of 750 m from the striking point. The results are presented for typical first and subsequent return strokes of lightning involving two cases, (i) perfectly conducting ground (ii) finitely conducting ground (σg=0.0001 S/m). The ground conductivity effects on the horizontal electric field components (static, induction and radiation) are studied. A comparison is made on the basis of computed results with typical first and subsequent strokes.
{"title":"Horizontal component of electric field due to lightning return strokes","authors":"K. Chandrasekaran, G. S. Punekar","doi":"10.1109/ICPES.2011.6156640","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156640","url":null,"abstract":"Lightning generated horizontal electric field above the ground have been computed and reported for a typical height of 10 m (above the ground plane), at a radial distance of 750 m from the striking point. The results are presented for typical first and subsequent return strokes of lightning involving two cases, (i) perfectly conducting ground (ii) finitely conducting ground (σg=0.0001 S/m). The ground conductivity effects on the horizontal electric field components (static, induction and radiation) are studied. A comparison is made on the basis of computed results with typical first and subsequent strokes.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130296217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156633
S. K. Gunda, D. Sarma
AC adjustable-speed drives (ASDs) have become the primary choice for most new and retrofit precision motor-control applications with increased system efficiency and reduced system losses. The significant increase in the use of ASDs brings the need for understanding compatibility issues between them and their electrical environment in order to design the electrical systems appropriately. A three-phase equivalent circuit model is developed to model adjustable speed drives (ASDs) for power system harmonic analysis by impedance model using Kalman filtering algorithm (KFA). The validity and accuracy of the model were validated by comparing Fast Fourier transform (FFT) from simulation results with equivalent impedance model using KFA. Theoretical derivations and simulation results are presented in this paper.
{"title":"Modelling of adjustable speed AC drives for harmonic studies using Kalman filtering algorithm","authors":"S. K. Gunda, D. Sarma","doi":"10.1109/ICPES.2011.6156633","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156633","url":null,"abstract":"AC adjustable-speed drives (ASDs) have become the primary choice for most new and retrofit precision motor-control applications with increased system efficiency and reduced system losses. The significant increase in the use of ASDs brings the need for understanding compatibility issues between them and their electrical environment in order to design the electrical systems appropriately. A three-phase equivalent circuit model is developed to model adjustable speed drives (ASDs) for power system harmonic analysis by impedance model using Kalman filtering algorithm (KFA). The validity and accuracy of the model were validated by comparing Fast Fourier transform (FFT) from simulation results with equivalent impedance model using KFA. Theoretical derivations and simulation results are presented in this paper.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116758696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156662
B. Rao, G. Kumar, R. Kumari, N. Raju
Power flow or load flow solution is essential for continuous evaluation of the performance of the power systems so that suitable control measures can be taken in case of necessity. Load flow studies are made to plan the best operation and control of the existing system as well as plan the future expansion to keep pace with the load growth. Generally in any power system operation, our main aim is to operate a power system optimally. Optimality can be achieved by minimizing the cost, losses and maintaining voltage profile. So in order to achieve the above conditions that is to operate a system in an optimal way we choose various optimization techniques namely, optimal power flow by Newton method (OPF) and Interior Point (IP) method. In this paper a 5-BUS test system is taken and analyzed using the above mentioned two methods. It is shown that how the system power losses are decreased and voltage profiles are increased after using Interior Point (IP) method in this model. The results are generated for 5-Bus system.
{"title":"Optimization of a power system with Interior Point method","authors":"B. Rao, G. Kumar, R. Kumari, N. Raju","doi":"10.1109/ICPES.2011.6156662","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156662","url":null,"abstract":"Power flow or load flow solution is essential for continuous evaluation of the performance of the power systems so that suitable control measures can be taken in case of necessity. Load flow studies are made to plan the best operation and control of the existing system as well as plan the future expansion to keep pace with the load growth. Generally in any power system operation, our main aim is to operate a power system optimally. Optimality can be achieved by minimizing the cost, losses and maintaining voltage profile. So in order to achieve the above conditions that is to operate a system in an optimal way we choose various optimization techniques namely, optimal power flow by Newton method (OPF) and Interior Point (IP) method. In this paper a 5-BUS test system is taken and analyzed using the above mentioned two methods. It is shown that how the system power losses are decreased and voltage profiles are increased after using Interior Point (IP) method in this model. The results are generated for 5-Bus system.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116958353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-01DOI: 10.1109/ICPES.2011.6156670
M. Manjula, S. Mishra, A. Sarma
This paper presents a novel method of detecting and classifying the power system faults of voltage sags based on Empirical Mode Decomposition (EMD). A technique employed for analyzing power system fault data in terms of voltage sags is required. Also, provides information about the underlying event i.e. the fault type. EMD is to method which decomposes a non stationary signal into mono component and symmetric component signals called Intrinsic Mode Functions (IMFs). Further the Hilbert Transform (HT) of IMF provides magnitude and phase angle information. The characteristic features of the first three IMFs of each phase are used as inputs to the classifier Probabilistic Neural Network (PNN) for identification of fault type. Four types of shunt faults are taken for classification. A comparison is also made with wavelet Transform (WT). Simulation results show that the classification accuracy is better for EMD, which proves that the method is efficient in classifying the faults.
{"title":"Empirical mode decomposition based probabilistic neural network for faults classification","authors":"M. Manjula, S. Mishra, A. Sarma","doi":"10.1109/ICPES.2011.6156670","DOIUrl":"https://doi.org/10.1109/ICPES.2011.6156670","url":null,"abstract":"This paper presents a novel method of detecting and classifying the power system faults of voltage sags based on Empirical Mode Decomposition (EMD). A technique employed for analyzing power system fault data in terms of voltage sags is required. Also, provides information about the underlying event i.e. the fault type. EMD is to method which decomposes a non stationary signal into mono component and symmetric component signals called Intrinsic Mode Functions (IMFs). Further the Hilbert Transform (HT) of IMF provides magnitude and phase angle information. The characteristic features of the first three IMFs of each phase are used as inputs to the classifier Probabilistic Neural Network (PNN) for identification of fault type. Four types of shunt faults are taken for classification. A comparison is also made with wavelet Transform (WT). Simulation results show that the classification accuracy is better for EMD, which proves that the method is efficient in classifying the faults.","PeriodicalId":158903,"journal":{"name":"2011 International Conference on Power and Energy Systems","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115386685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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