Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745322
M. Sindhu, M. Nair, T. Nambiar
Three-phase shunt active power filters are designed to effectively compensate for the current harmonics and reactive power requirements in a three-phase system with harmonic loads. An ANN (artificial neural network) based controller selects the amount of harmonic current injection based on the percentage of harmonic distortion present in the source current and also on the reactive power requirement of the load. The selection is done by the ANN with the help of a properly tuned knowledge base.
{"title":"An ANN based Digital Controller for a Three-phase Active Power Filter","authors":"M. Sindhu, M. Nair, T. Nambiar","doi":"10.1109/ICPST.2008.4745322","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745322","url":null,"abstract":"Three-phase shunt active power filters are designed to effectively compensate for the current harmonics and reactive power requirements in a three-phase system with harmonic loads. An ANN (artificial neural network) based controller selects the amount of harmonic current injection based on the percentage of harmonic distortion present in the source current and also on the reactive power requirement of the load. The selection is done by the ANN with the help of a properly tuned knowledge base.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125918916","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745157
M. Veerachary, M. Suresh
In this paper analysis and digital controller design for digital voltage-mode controlled higher order boost converter (HOBC) is presented. The state-space averaging method is applied to formulate the small-signal models; valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed. The results of controller design and closed-loop analysis are illustrated through computer simulations for 48 V applications. In this paper analysis and digital controller design for digital voltage-mode controlled HOBC is presented. The state-space averaging method is applied to formulate the small-signal models, valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed. The results of controller design and closed-loop analysis are illustrated through computer simulations for 48 V applications.
{"title":"Digital Voltage-mode Control Of Higher Order Boost Converter","authors":"M. Veerachary, M. Suresh","doi":"10.1109/ICPST.2008.4745157","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745157","url":null,"abstract":"In this paper analysis and digital controller design for digital voltage-mode controlled higher order boost converter (HOBC) is presented. The state-space averaging method is applied to formulate the small-signal models; valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed. The results of controller design and closed-loop analysis are illustrated through computer simulations for 48 V applications. In this paper analysis and digital controller design for digital voltage-mode controlled HOBC is presented. The state-space averaging method is applied to formulate the small-signal models, valid up-to half of the switching frequency, of the converter and a loop gain is adapted to design the voltage-mode discrete compensator. Closed-loop performance of the HOBC is analyzed. The results of controller design and closed-loop analysis are illustrated through computer simulations for 48 V applications.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125381947","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745300
M. K. Maharana, K. Swarup
Detection and identification of a power system emergency is necessary to fully utilize the capability of controls to mitigate emergencies. A new classification scheme of power system emergencies and its operating states is presented. Linear sensitivity and D-factor methods are used to identify the overloading of the power system components. Transient stability analysis is used to identify the emergency operating states of power system. Classification and detection of emergencies has been useful for developing emergency operating state controls. Test result shows the use of performance index and transient stability study as suitable for efficient identification of the emergency state of a power system.
{"title":"Identification of Operating States of Power System Using Transient Stability Analysis","authors":"M. K. Maharana, K. Swarup","doi":"10.1109/ICPST.2008.4745300","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745300","url":null,"abstract":"Detection and identification of a power system emergency is necessary to fully utilize the capability of controls to mitigate emergencies. A new classification scheme of power system emergencies and its operating states is presented. Linear sensitivity and D-factor methods are used to identify the overloading of the power system components. Transient stability analysis is used to identify the emergency operating states of power system. Classification and detection of emergencies has been useful for developing emergency operating state controls. Test result shows the use of performance index and transient stability study as suitable for efficient identification of the emergency state of a power system.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115019615","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745310
S. Murthy, G. Bhuvaneswari, Sarsing Gao, M. Sree Lalitha Gayathri
This paper presents the analysis of dynamic and steady state performance of a self excited induction generator (SEIG) with digitally controlled electronic load controller (ELC) feeding single phase loads. The excitation capacitors, electronic load controller, 1-phase load in conjunction with the d-q model of the 3-phase induction machine taking into account the saturation effect are used to predict the dynamic behavior of the SEIG. The digital control is realized by means of PIC18F252 microcontroller which provides a better performance with increased operational flexibility. Both simulation and hardware results have been presented for the digitally controlled ELC, which is more compact, reliable and cost effective for providing effective voltage regulation for field applications.
{"title":"Performance Analysis of a Self Excited Induction Generator with Digitally Controlled Electronic Load Controller for Micro Hydel Power Generation","authors":"S. Murthy, G. Bhuvaneswari, Sarsing Gao, M. Sree Lalitha Gayathri","doi":"10.1109/ICPST.2008.4745310","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745310","url":null,"abstract":"This paper presents the analysis of dynamic and steady state performance of a self excited induction generator (SEIG) with digitally controlled electronic load controller (ELC) feeding single phase loads. The excitation capacitors, electronic load controller, 1-phase load in conjunction with the d-q model of the 3-phase induction machine taking into account the saturation effect are used to predict the dynamic behavior of the SEIG. The digital control is realized by means of PIC18F252 microcontroller which provides a better performance with increased operational flexibility. Both simulation and hardware results have been presented for the digitally controlled ELC, which is more compact, reliable and cost effective for providing effective voltage regulation for field applications.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116084247","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745348
Vivek Shrivastava, R. B. Misra
The forecasting of electricity demand has become one of the major research fields in electrical engineering. The supply industry requires forecasts with lead times, which range from the short term (a few minutes, hours, or days ahead) to the long term (up to 20 years ahead). The major priority for an electrical power utility is to provide uninterrupted power supply to its customers. Long term peak load forecasting plays an important role in electrical power systems in terms of policy planning and budget allocation. This paper presents a peak load forecasting model using Artificial Neural Networks (ANN). The approach in the paper is based on multi-layered back-propagation feed forward neural network. A case study is performed using the proposed method of peak load data of the Grid Corporation of Orrissa (GRIDCO), India which maintain high quality, reliable, historical data.
{"title":"A Novel Approach of Input Variable Selection for ANN Based Load Forecasting","authors":"Vivek Shrivastava, R. B. Misra","doi":"10.1109/ICPST.2008.4745348","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745348","url":null,"abstract":"The forecasting of electricity demand has become one of the major research fields in electrical engineering. The supply industry requires forecasts with lead times, which range from the short term (a few minutes, hours, or days ahead) to the long term (up to 20 years ahead). The major priority for an electrical power utility is to provide uninterrupted power supply to its customers. Long term peak load forecasting plays an important role in electrical power systems in terms of policy planning and budget allocation. This paper presents a peak load forecasting model using Artificial Neural Networks (ANN). The approach in the paper is based on multi-layered back-propagation feed forward neural network. A case study is performed using the proposed method of peak load data of the Grid Corporation of Orrissa (GRIDCO), India which maintain high quality, reliable, historical data.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116098727","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745302
Guihong Feng, Yanxin Wang, Bingyi Zhang
The technology of extra-high voltage multi-circuit transmission lines on same tower is one novel transmitting technology, which can obviously decrease the route way resource, and the transmission capacity per area is increased prominently. But its electromagnetic environment problem is one of the keys which affect the feasibility of EHV transmission lines, so it's important to study the electromagnetic environment. This paper calculates the electric field intensity and magnetic field intensity generated by transmission lines in different phase line sequences of different tower modes. We can accurately obtain the electric field and magnetic field distribution under EHV transmission lines using finite element analysis. From these simulating results, we can get the most reasonable position of transmission lines on tower and the best phase line sequence which has the least electromagnetic field intensity in 500 kV/220 kV mixed voltage four-circuit transmission lines on same tower. This can provide theoretic reference for construction of transmission lines.
{"title":"Study on Electromagnetic Environment of Multi-circuit Transmission Lines on Same Tower","authors":"Guihong Feng, Yanxin Wang, Bingyi Zhang","doi":"10.1109/ICPST.2008.4745302","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745302","url":null,"abstract":"The technology of extra-high voltage multi-circuit transmission lines on same tower is one novel transmitting technology, which can obviously decrease the route way resource, and the transmission capacity per area is increased prominently. But its electromagnetic environment problem is one of the keys which affect the feasibility of EHV transmission lines, so it's important to study the electromagnetic environment. This paper calculates the electric field intensity and magnetic field intensity generated by transmission lines in different phase line sequences of different tower modes. We can accurately obtain the electric field and magnetic field distribution under EHV transmission lines using finite element analysis. From these simulating results, we can get the most reasonable position of transmission lines on tower and the best phase line sequence which has the least electromagnetic field intensity in 500 kV/220 kV mixed voltage four-circuit transmission lines on same tower. This can provide theoretic reference for construction of transmission lines.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122964533","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745327
V. S. Fating, S. Jadhav, R. Ugale, B. Chaudhari
Direct torque and flux control of ac machines is well established technique getting increasingly adapted in industry. This technique like other high performance control methods such as vector control is rarely applied to single phase machines. However, development of high performance low power drives is receiving some attention. This paper investigates the performance of single phase direct torque controlled induction motor drive. Unified modeling approach is used to adapt direct torque control (DTC) of both symmetrical as well as asymmetrical single phase induction motor. It is also demonstrated that it is possible to take winding and angle asymmetry into accounts. The drive is simulated using Simulink platform and the results are presented.
{"title":"Direct Torque Control of Symmetrical and Asymmetrical Single Phase Induction Motor","authors":"V. S. Fating, S. Jadhav, R. Ugale, B. Chaudhari","doi":"10.1109/ICPST.2008.4745327","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745327","url":null,"abstract":"Direct torque and flux control of ac machines is well established technique getting increasingly adapted in industry. This technique like other high performance control methods such as vector control is rarely applied to single phase machines. However, development of high performance low power drives is receiving some attention. This paper investigates the performance of single phase direct torque controlled induction motor drive. Unified modeling approach is used to adapt direct torque control (DTC) of both symmetrical as well as asymmetrical single phase induction motor. It is also demonstrated that it is possible to take winding and angle asymmetry into accounts. The drive is simulated using Simulink platform and the results are presented.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117010104","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745254
C. Xianming, Wang Wei, Lu Hongshui, L. Guohua, Zhu Xiaodong
De-excitation with varistor parallel connected to field winding for large generators has been widely used. However, field current and voltage become quite large for larger generators, such as 700 MW generator for Three-Gorge power plant, China. In order to put varistor into operation during de-excitation requirement for opening arc-voltage of dc field breaker is high and high. This causes big size, structure complexity, high cost and difficult maintenance of field breaker. That is why an alternating current de-excitation (ACDE) is adopted, which acts on ac side of thyristor rectifier-bridge for de-excitation. But up to now ACDE is not reliable enough, so ACDE in Three-Gorge power plant is used as an auxiliary for de-excitation. New ACDE proposed in the paper uses capacitor parallel connected to varistor, the former with inductance and resistance of field winding is able to cause serial resonance of RLC[1,2] and produce high voltage during de-excitation, which may force varistor to operate and fast de-excitation can be implemented. The field breaker on dc side of field may be omitted at all. Simulation proved that the new ACDE overcomes shortcoming of origin ACDE, and has high reliability.
{"title":"New Alternating current De-excitation for Large Hydraulic Generators","authors":"C. Xianming, Wang Wei, Lu Hongshui, L. Guohua, Zhu Xiaodong","doi":"10.1109/ICPST.2008.4745254","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745254","url":null,"abstract":"De-excitation with varistor parallel connected to field winding for large generators has been widely used. However, field current and voltage become quite large for larger generators, such as 700 MW generator for Three-Gorge power plant, China. In order to put varistor into operation during de-excitation requirement for opening arc-voltage of dc field breaker is high and high. This causes big size, structure complexity, high cost and difficult maintenance of field breaker. That is why an alternating current de-excitation (ACDE) is adopted, which acts on ac side of thyristor rectifier-bridge for de-excitation. But up to now ACDE is not reliable enough, so ACDE in Three-Gorge power plant is used as an auxiliary for de-excitation. New ACDE proposed in the paper uses capacitor parallel connected to varistor, the former with inductance and resistance of field winding is able to cause serial resonance of RLC[1,2] and produce high voltage during de-excitation, which may force varistor to operate and fast de-excitation can be implemented. The field breaker on dc side of field may be omitted at all. Simulation proved that the new ACDE overcomes shortcoming of origin ACDE, and has high reliability.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128793218","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745376
K. Vaisakh, L. Srinivas
An efficient evolutionary-based approach, termed as differential evolution (DE), is presented for the solution of optimal power flow (OPF) with the continuous variables. The continuous control variables are unit-active power outputs and generator-bus voltage magnitudes, transformer tap settings and switchable shunt devices. The differential evolution is illustrated for two case studies of IEEE-30 bus system. Both conventional and non-conventional cost characteristics are considered for the optimal power flow solution. The feasibility of the proposed method is compared with a simple evolutionary programming algorithm. The algorithm is computationally faster, in terms of the number of load flows executed, and provides better results than other heuristic techniques.
{"title":"Differential Evolution based OPF with Conventional and Non-Conventional Cost Characteristics","authors":"K. Vaisakh, L. Srinivas","doi":"10.1109/ICPST.2008.4745376","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745376","url":null,"abstract":"An efficient evolutionary-based approach, termed as differential evolution (DE), is presented for the solution of optimal power flow (OPF) with the continuous variables. The continuous control variables are unit-active power outputs and generator-bus voltage magnitudes, transformer tap settings and switchable shunt devices. The differential evolution is illustrated for two case studies of IEEE-30 bus system. Both conventional and non-conventional cost characteristics are considered for the optimal power flow solution. The feasibility of the proposed method is compared with a simple evolutionary programming algorithm. The algorithm is computationally faster, in terms of the number of load flows executed, and provides better results than other heuristic techniques.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123401711","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 : 2008-10-01DOI: 10.1109/ICPST.2008.4745232
Hailun Huang, Zheng Yan, Yunhe Hou
Based on the CVaR theory in financial risk field, a novel electricity-procurement portfolio optimization model for a local distribution company (LDC) is proposed, considering the risk and expected purchase cost synthetically. The conditional value at risk (CVaR) is used as the risk measurement index. The new model is applied to determine the electricity allocation ratio and efficient frontiers for the LDC in three markets. Simulation results demonstrate that the proposed model is correct, and it can guarantee the LDC to bear the minimum CVaR risk within a certain expected purchase cost. It provides an effective way for the LDC to make purchase decision and manage risks.
{"title":"A Novel CVaR Based Portfolio Optimization Model for LDC Electricity Procurement","authors":"Hailun Huang, Zheng Yan, Yunhe Hou","doi":"10.1109/ICPST.2008.4745232","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745232","url":null,"abstract":"Based on the CVaR theory in financial risk field, a novel electricity-procurement portfolio optimization model for a local distribution company (LDC) is proposed, considering the risk and expected purchase cost synthetically. The conditional value at risk (CVaR) is used as the risk measurement index. The new model is applied to determine the electricity allocation ratio and efficient frontiers for the LDC in three markets. Simulation results demonstrate that the proposed model is correct, and it can guarantee the LDC to bear the minimum CVaR risk within a certain expected purchase cost. It provides an effective way for the LDC to make purchase decision and manage risks.","PeriodicalId":107016,"journal":{"name":"2008 Joint International Conference on Power System Technology and IEEE Power India Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123491023","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：