Pub Date : 2011-12-01DOI: 10.1109/ISET-INDIA.2011.6145379
K. Mistry, R. Roy
The topology of distribution network can be modified time to time using sectionalizing and tie-switches for enhancement of voltage stability index to minimize system losses. This will also improve the voltage profile of each node. This paper proposes a novel method for hourly switching action for 16-node and 33-node radial distribution network for a single day by feeder reconfiguration considering static load model. At each node different load is considered. The active and reactive power of these loads are dependent on voltage magnitudes. The result shows that minimum voltage stability index is found at node where it has low voltage profile and higher losses.
{"title":"Enhancement of voltage stability index of distribution system by network reconfiguration including static load model and daily load curve","authors":"K. Mistry, R. Roy","doi":"10.1109/ISET-INDIA.2011.6145379","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145379","url":null,"abstract":"The topology of distribution network can be modified time to time using sectionalizing and tie-switches for enhancement of voltage stability index to minimize system losses. This will also improve the voltage profile of each node. This paper proposes a novel method for hourly switching action for 16-node and 33-node radial distribution network for a single day by feeder reconfiguration considering static load model. At each node different load is considered. The active and reactive power of these loads are dependent on voltage magnitudes. The result shows that minimum voltage stability index is found at node where it has low voltage profile and higher losses.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"27 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":"114928461","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/ISET-INDIA.2011.6145384
M. Thomas, S. Arora, V. Chandna
In the delivery of electricity from the generating station to the consumers, Power Distribution System (PDS) plays a major role. Electric power utilities worldwide are adopting the computer aided monitoring, control and management of PDS to provide better services to the consumers. Recent advances in Information Technology and data communication system are being utilized to automate the electric PDS. The next-generation electricity grid, which is the smart grid, is addressing the major shortcomings of the existing grid. In essence, the smart grid envisages providing utility companies with full visibility and control over their assets and services. This paper presents a review of automation of the Power systems with special emphasis on distribution automation, leading to a smarter grid. The distribution automation and distribution management system functions are discussed in detail and the emergence of a smart grid. The wide area monitoring and control implementation in the transmission sector is also touched upon. The paper also provides some insight into the expansion of laboratory facilities for smart grid implementation and research.
{"title":"Distribution automation leading to a smarter grid","authors":"M. Thomas, S. Arora, V. Chandna","doi":"10.1109/ISET-INDIA.2011.6145384","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145384","url":null,"abstract":"In the delivery of electricity from the generating station to the consumers, Power Distribution System (PDS) plays a major role. Electric power utilities worldwide are adopting the computer aided monitoring, control and management of PDS to provide better services to the consumers. Recent advances in Information Technology and data communication system are being utilized to automate the electric PDS. The next-generation electricity grid, which is the smart grid, is addressing the major shortcomings of the existing grid. In essence, the smart grid envisages providing utility companies with full visibility and control over their assets and services. This paper presents a review of automation of the Power systems with special emphasis on distribution automation, leading to a smarter grid. The distribution automation and distribution management system functions are discussed in detail and the emergence of a smart grid. The wide area monitoring and control implementation in the transmission sector is also touched upon. The paper also provides some insight into the expansion of laboratory facilities for smart grid implementation and research.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"60 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":"126009652","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/ISET-INDIA.2011.6145382
N. Venkateswarlu, M. Velmurugan, J. Suresh
Power electronics systems are non-linear systems, which consume more reactive power and also the loads they feed are mostly inductive loads which leads to a poor power factor. Various compensation techniques are available to bring the power factor nearer to unity. In this paper, a novel compensator is proposed, where in-phase and quadrature components of the supply current are vector-controlled. Implementation of this compensator in a power electronic system operating with a very poor power factor (and hence high THD), shows that the system then draws a leading current. A conventional power electronic system with one of the traditional static VAR compensators and the conventional power electronic system incorporated with the proposed compensator are simulated and the simulation results are obtained. It is shown that the proposed method offers only 0.7% THD, which also implies that the power factor is improved.
{"title":"Improvement of power factor in power electronic systems by using a method of compensation","authors":"N. Venkateswarlu, M. Velmurugan, J. Suresh","doi":"10.1109/ISET-INDIA.2011.6145382","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145382","url":null,"abstract":"Power electronics systems are non-linear systems, which consume more reactive power and also the loads they feed are mostly inductive loads which leads to a poor power factor. Various compensation techniques are available to bring the power factor nearer to unity. In this paper, a novel compensator is proposed, where in-phase and quadrature components of the supply current are vector-controlled. Implementation of this compensator in a power electronic system operating with a very poor power factor (and hence high THD), shows that the system then draws a leading current. A conventional power electronic system with one of the traditional static VAR compensators and the conventional power electronic system incorporated with the proposed compensator are simulated and the simulation results are obtained. It is shown that the proposed method offers only 0.7% THD, which also implies that the power factor is improved.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"16 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":"126561840","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/ISET-INDIA.2011.6145365
R. Samaga, K. Vittal, J. Vikas
Condition monitoring units are employed in industries to monitor the health of the machines continuously. Air gap eccentricity fault is one of the asymmetrical faults which can result in the machine failure. Motor Current Signature Analysis and Vibration Analysis are the two most popular methods used for eccentricity fault detection in the induction motor. In this paper, a study conducted on an induction motor to analyse the effect of supply voltage unbalance on the method of eccentricity fault detection by Motor Current Signature Analysis is presented. A dynamic model of the induction motor suffering from air gap eccentricity and has the capability to take unbalance supply voltage is developed and the results obtained by simulating this model are validated by the experiments conducted on an induction motor suffering from inclined mixed eccentricity and fed with unbalance voltage supply.
{"title":"Effect of unbalance in voltage supply on the detection of mixed air gap eccentricity in an induction motor by Motor Current Signature Analysis","authors":"R. Samaga, K. Vittal, J. Vikas","doi":"10.1109/ISET-INDIA.2011.6145365","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145365","url":null,"abstract":"Condition monitoring units are employed in industries to monitor the health of the machines continuously. Air gap eccentricity fault is one of the asymmetrical faults which can result in the machine failure. Motor Current Signature Analysis and Vibration Analysis are the two most popular methods used for eccentricity fault detection in the induction motor. In this paper, a study conducted on an induction motor to analyse the effect of supply voltage unbalance on the method of eccentricity fault detection by Motor Current Signature Analysis is presented. A dynamic model of the induction motor suffering from air gap eccentricity and has the capability to take unbalance supply voltage is developed and the results obtained by simulating this model are validated by the experiments conducted on an induction motor suffering from inclined mixed eccentricity and fed with unbalance voltage supply.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"84 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":"121206263","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/ISET-INDIA.2011.6145358
M. Mandala, C. P. Gupta
This paper proposes an optimal strategic bidding with transmission congestion using Particle Swarm Optimization with Time varying acceleration coefficients (PSO-TVAC). A bilevel programming (BLP) technique is formulated in which upper level problem represents an individual generating company (Genco) profit maximization and the lower level represents the independent system operator's (ISO) market clearing problem with and without transmission congestion. The values of Transmission Congestion Distribution factors (TCDFs) are used to select redispatch of generators for congestion management with and without generator reactive power procurement. Numerical result on test system IEEE 30 bus is presented for illustration purpose and the results are compared with Particle swarm optimization (PSO), Particle Swarm Optimization with Time Varying Inertia Weight (PSO-TVIW) and Particle Swarm Optimization with Time Varying acceleration coefficients (PSO-TVAC) in terms of solution quality. The comprehensive experimental results prove that the PSO-TVAC is one among the challenging optimization methods which is indeed capable of obtaining higher quality solutions for the proposed problem.
{"title":"Gencos optimal strategic bidding with transmission constraints using particle swarm optimization","authors":"M. Mandala, C. P. Gupta","doi":"10.1109/ISET-INDIA.2011.6145358","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145358","url":null,"abstract":"This paper proposes an optimal strategic bidding with transmission congestion using Particle Swarm Optimization with Time varying acceleration coefficients (PSO-TVAC). A bilevel programming (BLP) technique is formulated in which upper level problem represents an individual generating company (Genco) profit maximization and the lower level represents the independent system operator's (ISO) market clearing problem with and without transmission congestion. The values of Transmission Congestion Distribution factors (TCDFs) are used to select redispatch of generators for congestion management with and without generator reactive power procurement. Numerical result on test system IEEE 30 bus is presented for illustration purpose and the results are compared with Particle swarm optimization (PSO), Particle Swarm Optimization with Time Varying Inertia Weight (PSO-TVIW) and Particle Swarm Optimization with Time Varying acceleration coefficients (PSO-TVAC) in terms of solution quality. The comprehensive experimental results prove that the PSO-TVAC is one among the challenging optimization methods which is indeed capable of obtaining higher quality solutions for the proposed problem.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"6 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":"122611235","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/ISET-INDIA.2011.6145368
V. K. Jadoun, K. R. Niazi, A. Swarnkar, N. Gupta
This paper presents Variable Acceleration Coefficient-based Particle Swarm Optimization (VACPSO) method to solve the economic load dispatch for minimizing fuel cost while considering prohibited operating zones and valve point effect. The proposed VACPSO is a modified version of the conventional Particle Swarm Optimization (PSO). Three modifications are suggested in the proposed VACPSO. First, the cognitive behavior of particle is influenced by best and worst experience. Second, three acceleration coefficients, instead of two as in the conventional PSO, are suggested. Third, the acceleration coefficients are made variable rather than assigning them merely a fixed value. These suggested modifications facilitate better exploration of the search space with less computational burden. The proposed method is tested on two standard generating systems available in the literature. The application results and comparison with other recent approaches show that the proposed approach provides good quality solution with less computational time.
{"title":"Variable Acceleration Coefficient-based Particle Swarm Optimization for Non-Convex Economic load dispatch problem","authors":"V. K. Jadoun, K. R. Niazi, A. Swarnkar, N. Gupta","doi":"10.1109/ISET-INDIA.2011.6145368","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145368","url":null,"abstract":"This paper presents Variable Acceleration Coefficient-based Particle Swarm Optimization (VACPSO) method to solve the economic load dispatch for minimizing fuel cost while considering prohibited operating zones and valve point effect. The proposed VACPSO is a modified version of the conventional Particle Swarm Optimization (PSO). Three modifications are suggested in the proposed VACPSO. First, the cognitive behavior of particle is influenced by best and worst experience. Second, three acceleration coefficients, instead of two as in the conventional PSO, are suggested. Third, the acceleration coefficients are made variable rather than assigning them merely a fixed value. These suggested modifications facilitate better exploration of the search space with less computational burden. The proposed method is tested on two standard generating systems available in the literature. The application results and comparison with other recent approaches show that the proposed approach provides good quality solution with less computational time.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"65 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":"132740071","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/ISET-INDIA.2011.6145364
Babasaheb Kharbas, M. Fozdar, H. Tiwari
The transmission tariff function will facilitate competitive electricity market by impartially providing energy transportation services to all energy buyers and sellers, while fairly recovering the cost of providing those services. Transmission tariff is more fairly and transparently allocated in order to get full recovery of ARR of transmission facilities by using combination of MW-Mile and Postage stamp method. There are number of variants of MW-Mile method i.e. absolute, dominant and reverse are combined with postage stamp method to allocate the transmission tariff. In this paper a six bus network is used for simulation purpose with two cases of demand variation. It is assumed in this problem the load customer pays the 100% cost of transmission services to the transmission utility. Simulation and results are obtained by using Matlab. Transmission tariff for each load bus is evaluated in all three combinations of MW-mile with postage stamp for each case of demand variation.
{"title":"Transmission tariff allocation using combined MW-Mile & Postage stamp methods","authors":"Babasaheb Kharbas, M. Fozdar, H. Tiwari","doi":"10.1109/ISET-INDIA.2011.6145364","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145364","url":null,"abstract":"The transmission tariff function will facilitate competitive electricity market by impartially providing energy transportation services to all energy buyers and sellers, while fairly recovering the cost of providing those services. Transmission tariff is more fairly and transparently allocated in order to get full recovery of ARR of transmission facilities by using combination of MW-Mile and Postage stamp method. There are number of variants of MW-Mile method i.e. absolute, dominant and reverse are combined with postage stamp method to allocate the transmission tariff. In this paper a six bus network is used for simulation purpose with two cases of demand variation. It is assumed in this problem the load customer pays the 100% cost of transmission services to the transmission utility. Simulation and results are obtained by using Matlab. Transmission tariff for each load bus is evaluated in all three combinations of MW-mile with postage stamp for each case of demand variation.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"89 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":"133324136","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/ISET-INDIA.2011.6145357
S. Srinath, C. Kumar, M. Selvan
The impact of voltage quality on the operation of sensitive equipment is very critical. Dynamic Voltage Compensator (DVC) is the prime solution to mitigate the voltage quality problems. This paper investigates the compensation performance of a DVC connected to a distribution system, equipped with a simple control based on in-phase compensation and without using any transformations for reference generation. The efficacy of the controller under steady state operation to mitigate voltage sag, swell and unbalance is analyzed through intensive simulation in MATLAB / SIMULINK. The present investigation is confined to balanced sinusoidal systems with a fixed balanced load. The transformation less approach leads to simple control with reduced computation.
{"title":"Dynamic Voltage Compensator: Transformationless control perspective","authors":"S. Srinath, C. Kumar, M. Selvan","doi":"10.1109/ISET-INDIA.2011.6145357","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145357","url":null,"abstract":"The impact of voltage quality on the operation of sensitive equipment is very critical. Dynamic Voltage Compensator (DVC) is the prime solution to mitigate the voltage quality problems. This paper investigates the compensation performance of a DVC connected to a distribution system, equipped with a simple control based on in-phase compensation and without using any transformations for reference generation. The efficacy of the controller under steady state operation to mitigate voltage sag, swell and unbalance is analyzed through intensive simulation in MATLAB / SIMULINK. The present investigation is confined to balanced sinusoidal systems with a fixed balanced load. The transformation less approach leads to simple control with reduced computation.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"65 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":"134399369","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/ISET-INDIA.2011.6145340
M. Akbari, M. Golkar, S. Tafreshi
The stability of dc and ac bus voltage is of the most important issues in all microgrids including ac, dc or ac/dc hybrid microgrids. In this paper, a hybrid ac/dc microgrid is proposed to reduce processes of multiple reverse conversions in an ac or dc microgrid and to facilitate the connection of various renewable ac and dc sources and loads to power system. Also, all control schemes used among all converters will be developed in order to improve the voltage stability of hybrid microgrid. To give robustness to improved dynamic voltage stability of the microgrid, a voltage stabilizer is proposed and applied to the doubly fed induction generator (DFIG) installed in ac part. Furthermore, a particle swarm optimization (PSO) solution is proposed to optimize the various control gains among various converters in order to quickly restore and stabilize the voltage of both ac and dc parts under the different disturbances. The achieved results verify the controllers robustness and optimization algorithm efficiency.
{"title":"A PSO solution for improved voltage stability of a hybrid ac-dc microgrid","authors":"M. Akbari, M. Golkar, S. Tafreshi","doi":"10.1109/ISET-INDIA.2011.6145340","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145340","url":null,"abstract":"The stability of dc and ac bus voltage is of the most important issues in all microgrids including ac, dc or ac/dc hybrid microgrids. In this paper, a hybrid ac/dc microgrid is proposed to reduce processes of multiple reverse conversions in an ac or dc microgrid and to facilitate the connection of various renewable ac and dc sources and loads to power system. Also, all control schemes used among all converters will be developed in order to improve the voltage stability of hybrid microgrid. To give robustness to improved dynamic voltage stability of the microgrid, a voltage stabilizer is proposed and applied to the doubly fed induction generator (DFIG) installed in ac part. Furthermore, a particle swarm optimization (PSO) solution is proposed to optimize the various control gains among various converters in order to quickly restore and stabilize the voltage of both ac and dc parts under the different disturbances. The achieved results verify the controllers robustness and optimization algorithm efficiency.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"9 3 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":"116787714","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/ISET-INDIA.2011.6145350
S. Neelima, Dr. P. S. Subramanyam
A distribution system is an interface between the bulk power system and the consumers. Among these systems, radial distributions system is popular because of low cost and simple design. In distribution systems, the voltages at buses decrease proportionally, when moved away from the substation, also the losses increases quadraticaly. The reason for decrease in voltage and increase in losses is the insufficient amount of reactive power, which can be provided by the shunt capacitors. But the placement of the capacitor with appropriate size is always a challenge. Thus the optimal capacitor placement problem is to determine the location and size of capacitors to be placed in distribution networks in an efficient way to reduce the power losses and improve the voltage profile of the system. For this purpose, in this paper, two stage methodologies are used. In first stage, the load flow of pre-compensated distribution system is carried out using ‘dimension reducing distribution load flow algorithm (DRDLFA)’. On the basis of this load flow the potential locations of compensation are computed. In the second stage, Differential Evolution (DE) Algorithm is used to determine the optimal location and size of the capacitors such that the cost of the energy loss and capacitor cost to be a minimum. The above method is tested on IEEE 69 bus system and compared with other methods in the literature like Particle swarm optimization.
{"title":"Optimal capacitor placement in distribution networks using differential evolution incorporating dimension reducing power flow method","authors":"S. Neelima, Dr. P. S. Subramanyam","doi":"10.1109/ISET-INDIA.2011.6145350","DOIUrl":"https://doi.org/10.1109/ISET-INDIA.2011.6145350","url":null,"abstract":"A distribution system is an interface between the bulk power system and the consumers. Among these systems, radial distributions system is popular because of low cost and simple design. In distribution systems, the voltages at buses decrease proportionally, when moved away from the substation, also the losses increases quadraticaly. The reason for decrease in voltage and increase in losses is the insufficient amount of reactive power, which can be provided by the shunt capacitors. But the placement of the capacitor with appropriate size is always a challenge. Thus the optimal capacitor placement problem is to determine the location and size of capacitors to be placed in distribution networks in an efficient way to reduce the power losses and improve the voltage profile of the system. For this purpose, in this paper, two stage methodologies are used. In first stage, the load flow of pre-compensated distribution system is carried out using ‘dimension reducing distribution load flow algorithm (DRDLFA)’. On the basis of this load flow the potential locations of compensation are computed. In the second stage, Differential Evolution (DE) Algorithm is used to determine the optimal location and size of the capacitors such that the cost of the energy loss and capacitor cost to be a minimum. The above method is tested on IEEE 69 bus system and compared with other methods in the literature like Particle swarm optimization.","PeriodicalId":265646,"journal":{"name":"ISGT2011-India","volume":"69 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":"115581314","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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