Pub Date : 2008-10-01DOI: 10.1109/ICPST.2008.4745240
P.F. de Toledo, Jiuping Pan, K. Srivastava, Weiguo Wang, Chao Hong
There are serious concerns relating to a multi-infeed HVDC system when feeding a weak AC network. Typical issues concerning multi-infeed configurations are: need for coordination of the recovery control, need for different DC modulation strategies to stabilize the system, possibility of voltage instability of the area receiving large amount of power from multiple HVDC links and the risk of mutual commutation failures. In contrast, if the area receiving electrical power from multiple HVDC transmission links is relatively strong due to the presence of large amount of generation units nearby there are still some questions that need to be investigated such as the issues underlining the operation of such a multi-infeed system, the proper design of the controls of the HVDC systems and the system dynamic performance under extreme contingencies. This paper investigates into an example of such a multi-infeed HVDC system. The authors have performed small signal analysis of the system to assess instability associated with the control modes. Electromechanical and voltage stability analysis were performed for harmful contingencies. Dynamic performance analysis was also carried out to analyze the interaction amongst various HVDC inverters during disturbances.
{"title":"Case Study of a Multi-Infeed HVDC System","authors":"P.F. de Toledo, Jiuping Pan, K. Srivastava, Weiguo Wang, Chao Hong","doi":"10.1109/ICPST.2008.4745240","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745240","url":null,"abstract":"There are serious concerns relating to a multi-infeed HVDC system when feeding a weak AC network. Typical issues concerning multi-infeed configurations are: need for coordination of the recovery control, need for different DC modulation strategies to stabilize the system, possibility of voltage instability of the area receiving large amount of power from multiple HVDC links and the risk of mutual commutation failures. In contrast, if the area receiving electrical power from multiple HVDC transmission links is relatively strong due to the presence of large amount of generation units nearby there are still some questions that need to be investigated such as the issues underlining the operation of such a multi-infeed system, the proper design of the controls of the HVDC systems and the system dynamic performance under extreme contingencies. This paper investigates into an example of such a multi-infeed HVDC system. The authors have performed small signal analysis of the system to assess instability associated with the control modes. Electromechanical and voltage stability analysis were performed for harmful contingencies. Dynamic performance analysis was also carried out to analyze the interaction amongst various HVDC inverters during disturbances.","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":"115961107","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.2008.4745368
S. Dambhare, S. Soman, M. Chandorkar
This paper proposes a novel approach for sensitive current differential protection of transmission line. The improvement in sensitivity is a result of adaptive control of the restraining region in a current differential plane. The discriminant function used in differential protection corresponds to the ratio of series branch current in the pi- equivalent model of the transmission line. It requires time synchronous measurements which can be obtained from Global positioning system (GPS). Electromagnetic transient program (EMTP) simulations on a four machine ten bus system are used to substantiate the claims. The results brings out the superiority of the proposed approach.
{"title":"Novel Sensitive Current Differential Protection of Transmission Line","authors":"S. Dambhare, S. Soman, M. Chandorkar","doi":"10.1109/ICPST.2008.4745368","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745368","url":null,"abstract":"This paper proposes a novel approach for sensitive current differential protection of transmission line. The improvement in sensitivity is a result of adaptive control of the restraining region in a current differential plane. The discriminant function used in differential protection corresponds to the ratio of series branch current in the pi- equivalent model of the transmission line. It requires time synchronous measurements which can be obtained from Global positioning system (GPS). Electromagnetic transient program (EMTP) simulations on a four machine ten bus system are used to substantiate the claims. The results brings out the superiority of the proposed approach.","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":"121588560","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.2008.4745331
S. Ghoshal, R. Roy
This paper presents the comparative analysis of the optimal transient performance of automatic generation control (AGC) of an interconnected two-area power system, having multiple thermal-hydro-diesel mixed generating units. The significant improvement of optimal transient performance is observed with the addition of a thyristor-controlled phase shifter (TCPS) in the tie-line or small capacitive energy storage (CES) units fitted in both the areas. The optimal values of the gain settings are obtained by three different optimization algorithms. Craziness based particle swarm optimization (CRPSO) proves to be moderately fast algorithm and yields true optimal gains and minimum overshoot, minimum undershoot and minimum settling time of the transient response. Comparative study of TCPS and CES reveals that the CES units fitted in both the areas improve the transient performance to a greater extent following small load disturbance(s) in both the areas.
{"title":"Evolutionary Computation Based Comparative Study of TCPS and CES Control Applied to Automatic Generation Control","authors":"S. Ghoshal, R. Roy","doi":"10.1109/ICPST.2008.4745331","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745331","url":null,"abstract":"This paper presents the comparative analysis of the optimal transient performance of automatic generation control (AGC) of an interconnected two-area power system, having multiple thermal-hydro-diesel mixed generating units. The significant improvement of optimal transient performance is observed with the addition of a thyristor-controlled phase shifter (TCPS) in the tie-line or small capacitive energy storage (CES) units fitted in both the areas. The optimal values of the gain settings are obtained by three different optimization algorithms. Craziness based particle swarm optimization (CRPSO) proves to be moderately fast algorithm and yields true optimal gains and minimum overshoot, minimum undershoot and minimum settling time of the transient response. Comparative study of TCPS and CES reveals that the CES units fitted in both the areas improve the transient performance to a greater extent following small load disturbance(s) in both the areas.","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":"116602299","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.2008.4745325
P. Kumar, T. Isha
This paper describes a method to obtain the magnetic characteristics of an 8/6 switched reluctance machine (SRM). Finite element method (FEM) using ANSYS 10.0 software is used for the purpose. Machine model is created by Pro-Engineer software for the ANSYS environment. To model the machine using FEM, the geometry and mechanical parameters of the machine are established. Then the model is developed to obtain the flux linkage, current and rotor position relationship, and inductance is computed. Further, this inductance was verified experimentally and found in agreement with each other.
{"title":"Inductance Calculation of 8/6 Switched Reluctance Motor","authors":"P. Kumar, T. Isha","doi":"10.1109/ICPST.2008.4745325","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745325","url":null,"abstract":"This paper describes a method to obtain the magnetic characteristics of an 8/6 switched reluctance machine (SRM). Finite element method (FEM) using ANSYS 10.0 software is used for the purpose. Machine model is created by Pro-Engineer software for the ANSYS environment. To model the machine using FEM, the geometry and mechanical parameters of the machine are established. Then the model is developed to obtain the flux linkage, current and rotor position relationship, and inductance is computed. Further, this inductance was verified experimentally and found in agreement with each other.","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":"122743620","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.2008.4745189
Han Zhong-xu, Huang Huan-pao, Zhang Zhi, Sun Ying
Automatic generation control (AGC) is an essential requirement of modern power system automatic control. At present, slow response to AGC load demand is a serious problem existing in thermal power units taking part in AGC, which makes the control performance of power system AGC poor. The unit one and unit two of Yaomeng Power Co. Ltd., are all once-through boiler, its boiler-turbine coordinated control system (CCS) is based on incremental state observer combined with conventional PID control, and the connection logic of CCS with AGC adopted the scheme shown in this paper. Through adopting the connection logic of CCS with AGC, the pre-add coal function can be realized in AGC mode, which assured the rapid response to AGC load demand of the power unit, and this viewpoint has been fully proved by the trend curves of AGC adjusting test of the two units.
{"title":"Optimization Design on Boiler-turbine Coordinated Control System with Automatic Generation Control","authors":"Han Zhong-xu, Huang Huan-pao, Zhang Zhi, Sun Ying","doi":"10.1109/ICPST.2008.4745189","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745189","url":null,"abstract":"Automatic generation control (AGC) is an essential requirement of modern power system automatic control. At present, slow response to AGC load demand is a serious problem existing in thermal power units taking part in AGC, which makes the control performance of power system AGC poor. The unit one and unit two of Yaomeng Power Co. Ltd., are all once-through boiler, its boiler-turbine coordinated control system (CCS) is based on incremental state observer combined with conventional PID control, and the connection logic of CCS with AGC adopted the scheme shown in this paper. Through adopting the connection logic of CCS with AGC, the pre-add coal function can be realized in AGC mode, which assured the rapid response to AGC load demand of the power unit, and this viewpoint has been fully proved by the trend curves of AGC adjusting test of the two units.","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":"121276532","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.2008.4745278
B. Vahidi, Saeed Jazebi, H. Baghaee, Mohammad Tahan, M. Asadi
A robust control strategy is proposed to control UPFC in different operating conditions. PI regulators used for UPFC suffer from the inadequacies of providing suitable control for transient stability enhancement over a wide range of system operating conditions. In this paper an optimization method based on particle-swarm optimization (PSO) algorithm is presented to optimize the parameters of the PI controller of UPFC in order to enhance the power system transient stability. This scheme dispenses the gain dependency of the proportional or integral gains and generates independent control actions. The effectiveness of the proposed method is demonstrated using simulations of a multi-machine power system.
{"title":"Power System Stabilization Improvement by Using PSO-based UPFC","authors":"B. Vahidi, Saeed Jazebi, H. Baghaee, Mohammad Tahan, M. Asadi","doi":"10.1109/ICPST.2008.4745278","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745278","url":null,"abstract":"A robust control strategy is proposed to control UPFC in different operating conditions. PI regulators used for UPFC suffer from the inadequacies of providing suitable control for transient stability enhancement over a wide range of system operating conditions. In this paper an optimization method based on particle-swarm optimization (PSO) algorithm is presented to optimize the parameters of the PI controller of UPFC in order to enhance the power system transient stability. This scheme dispenses the gain dependency of the proportional or integral gains and generates independent control actions. The effectiveness of the proposed method is demonstrated using simulations of a multi-machine 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":"133327799","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.2008.4745202
H. K. Karegar, A. Mousavi
In this paper different grounding systems of wind turbines will be proposed. For each grounding system the step and touch voltage will be obtained and the entire grounding system will be analyzed by boundary element method. The paper introduces a new grounding system which decreases the step voltage, touch voltage and grounding resistance. The MATLAB is used for programming and simulation of the proposed grounding system. Finally, a case study in accordance with VESTAS wind turbine grounding system will be investigated.
{"title":"Wind Turbines Grounding System, Boundary Element Approach","authors":"H. K. Karegar, A. Mousavi","doi":"10.1109/ICPST.2008.4745202","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745202","url":null,"abstract":"In this paper different grounding systems of wind turbines will be proposed. For each grounding system the step and touch voltage will be obtained and the entire grounding system will be analyzed by boundary element method. The paper introduces a new grounding system which decreases the step voltage, touch voltage and grounding resistance. The MATLAB is used for programming and simulation of the proposed grounding system. Finally, a case study in accordance with VESTAS wind turbine grounding system will be investigated.","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":"133749534","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.2008.4745163
S. Kannan, A. Monica, S. Slochanal
Electric distribution systems are becoming large and complex leading to higher system losses and poor voltage regulation. This has stressed the need for an efficient and effective distribution network. The main objective of this paper work is to determine optimal location for capacitor placement in radial distribution feeders to improve the voltage profile and reduce the energy loss. This problem of capacitor placement is solved using fuzzy approximate reasoning and sizing is solved using particle swarm optimization technique. Firstly, an efficient load flow solution for the radial feeder is obtained by a suitable algorithm. Voltage and real power loss index of distribution system nodes are modeled by fuzzy membership function. Then, a fuzzy inference system containing a set of heuristic rules is designed to determine candidate nodes suitable for capacitor placement in the distribution system. Capacitors are placed on the nodes with highest sensitivity index. Three test radial feeders are solved using the proposed development to illustrate the technique and results simulated from MATLAB.
{"title":"Fuzzy Logic Based Optimal Capacitor Placement on Radial Distribution Feeders","authors":"S. Kannan, A. Monica, S. Slochanal","doi":"10.1109/ICPST.2008.4745163","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745163","url":null,"abstract":"Electric distribution systems are becoming large and complex leading to higher system losses and poor voltage regulation. This has stressed the need for an efficient and effective distribution network. The main objective of this paper work is to determine optimal location for capacitor placement in radial distribution feeders to improve the voltage profile and reduce the energy loss. This problem of capacitor placement is solved using fuzzy approximate reasoning and sizing is solved using particle swarm optimization technique. Firstly, an efficient load flow solution for the radial feeder is obtained by a suitable algorithm. Voltage and real power loss index of distribution system nodes are modeled by fuzzy membership function. Then, a fuzzy inference system containing a set of heuristic rules is designed to determine candidate nodes suitable for capacitor placement in the distribution system. Capacitors are placed on the nodes with highest sensitivity index. Three test radial feeders are solved using the proposed development to illustrate the technique and results simulated from MATLAB.","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":"134019059","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.2008.4745367
V. Jhanwar, A. Pradhan
This paper presents a new logic of operation for time overcurrent relays. With the application of the proposed technique, the sensitivity of time overcurrent relays is increased. In this paper, we have proposed a new relay algorithm using fundamental component where the trip time of relay is not set using only the initial current, rather it is updated using the current as the fault progresses. The functional structure is described and the logic of overcurrent relay is evaluated under a phase-ground fault condition. A significant decrement in the operating time is observed.
{"title":"Accurate Overcurrent Relay Algorithm using Fundamental Component","authors":"V. Jhanwar, A. Pradhan","doi":"10.1109/ICPST.2008.4745367","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745367","url":null,"abstract":"This paper presents a new logic of operation for time overcurrent relays. With the application of the proposed technique, the sensitivity of time overcurrent relays is increased. In this paper, we have proposed a new relay algorithm using fundamental component where the trip time of relay is not set using only the initial current, rather it is updated using the current as the fault progresses. The functional structure is described and the logic of overcurrent relay is evaluated under a phase-ground fault condition. A significant decrement in the operating time is observed.","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":"133084828","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.2008.4745384
N. Kumarappan, K. Suresh
Maintenance scheduling plays a very important and vital role in power system planning. Any equipment irrespective of its size and complexity will have to be serviced periodically to ensure that the equipment does not fail to operate during normal operation. However, the maintenance-scheduling problem is a constrained optimization problem. The objective function of this problem is to reduce the loss of load probability (LOLP) for a given power system while at the same time, all the generators in the given power system has been serviced completely. The method used in this paper is the levelized risk method, which is being used widely compared to the other methods. The challenge with this paper lies in creating a maintenance schedule which satisfies the constraints with an optimum LOLP for the given power system. Particle swarm optimization (PSO) technique has been used to solve this constrained optimization problem effectively. An IEEE reliability test system (RTS) is taken and a maintenance schedule is prepared for that system.
{"title":"Particle Swarm Optimization Based Approach to Maintenance Scheduling Using Levelized Risk Method","authors":"N. Kumarappan, K. Suresh","doi":"10.1109/ICPST.2008.4745384","DOIUrl":"https://doi.org/10.1109/ICPST.2008.4745384","url":null,"abstract":"Maintenance scheduling plays a very important and vital role in power system planning. Any equipment irrespective of its size and complexity will have to be serviced periodically to ensure that the equipment does not fail to operate during normal operation. However, the maintenance-scheduling problem is a constrained optimization problem. The objective function of this problem is to reduce the loss of load probability (LOLP) for a given power system while at the same time, all the generators in the given power system has been serviced completely. The method used in this paper is the levelized risk method, which is being used widely compared to the other methods. The challenge with this paper lies in creating a maintenance schedule which satisfies the constraints with an optimum LOLP for the given power system. Particle swarm optimization (PSO) technique has been used to solve this constrained optimization problem effectively. An IEEE reliability test system (RTS) is taken and a maintenance schedule is prepared for that 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":"133814897","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：