Pub Date : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069387
Abdolhamid Farshadi, H. Nafisi, Hossein Askarian‐Abyaneh
Due to the growing use of photovoltaic (PV) systems in distribution networks and sensitivity of these systems to high current caused by faults, it is crucial to quickly detect the occurrence of a fault in the network and protect the PV system. This paper proposes a method that uses the direct-axis current component (id) and its rate of change, which is one of the control parameters of the PV system, to detect faults in less than a half cycle. For this purpose, the PV system is precisely modeled in PSCAD/EMTDC software. To verify the performance of the proposed method, various simulations are performed by considering load variations, irradiation fluctuations and various types of faults. The results show the effectiveness of the method both in distinguishing load variations and irradiation fluctuations from faults as well as fault detection.
{"title":"Fault Detection Method for DG Disconnection in Inverter-Interfaced Microgrids with Photovoltaic System","authors":"Abdolhamid Farshadi, H. Nafisi, Hossein Askarian‐Abyaneh","doi":"10.1109/IPAPS49326.2019.9069387","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069387","url":null,"abstract":"Due to the growing use of photovoltaic (PV) systems in distribution networks and sensitivity of these systems to high current caused by faults, it is crucial to quickly detect the occurrence of a fault in the network and protect the PV system. This paper proposes a method that uses the direct-axis current component (id) and its rate of change, which is one of the control parameters of the PV system, to detect faults in less than a half cycle. For this purpose, the PV system is precisely modeled in PSCAD/EMTDC software. To verify the performance of the proposed method, various simulations are performed by considering load variations, irradiation fluctuations and various types of faults. The results show the effectiveness of the method both in distinguishing load variations and irradiation fluctuations from faults as well as fault detection.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116539786","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069378
Behrooz Taheri, S. A. Hosseini, Sirus Salehimehr, F. Razavi
The stability of power systems has always been an important issue of the electric power transmission industry. Protection systems are one of the significant factors guaranteeing the stability. A very big problem of such systems is that a system defect will be detected when there is a fault in the system. In this case, if the protection system does not operate correct, the power system may encounter instability. The instability of power systems can cause severe damage to power transmission companies and consumers. Protection systems require periodic tests in order to prevent such an incident. In this paper, a new method was introduced for the end-to-end test of the longitudinal differential protective relay. This method was implemented on the AMT-105 relay tester device made by Vebko Amirkabir Company. The proposed algorithm was tested both in a laboratory and in practical conditions (with real line relays). In the following, the test results are expressed in different fault types. The results obviously shows that the mentioned algorithm has the same performance against different faults and there are low changes in the results. This increases insure of the algorithm and its results that is very important in relay Testing.
{"title":"A New Method for the End-To-End Testing of Differential Relays","authors":"Behrooz Taheri, S. A. Hosseini, Sirus Salehimehr, F. Razavi","doi":"10.1109/IPAPS49326.2019.9069378","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069378","url":null,"abstract":"The stability of power systems has always been an important issue of the electric power transmission industry. Protection systems are one of the significant factors guaranteeing the stability. A very big problem of such systems is that a system defect will be detected when there is a fault in the system. In this case, if the protection system does not operate correct, the power system may encounter instability. The instability of power systems can cause severe damage to power transmission companies and consumers. Protection systems require periodic tests in order to prevent such an incident. In this paper, a new method was introduced for the end-to-end test of the longitudinal differential protective relay. This method was implemented on the AMT-105 relay tester device made by Vebko Amirkabir Company. The proposed algorithm was tested both in a laboratory and in practical conditions (with real line relays). In the following, the test results are expressed in different fault types. The results obviously shows that the mentioned algorithm has the same performance against different faults and there are low changes in the results. This increases insure of the algorithm and its results that is very important in relay Testing.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129840497","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069375
Seyed Sajad Hazaveh, N. Khodabakhshi-Javinani, Ali Bayandour, N. Jalali, Hossein Askarian‐Abyaneh
Calculating the time the message sent from the MCPU to the Integrated Radio Consulting Services (MCPU) relay needs to be calculated from the system topology change because of the need or desire for the services provided. The MCPU is best served by using the MCPU to give you the best option that has changed potential locations and is updating.
{"title":"Communication Delay Time Investigation of Over Current Adaptive Relays in a IEC 61850 based Micro-grid in the Presence of Error","authors":"Seyed Sajad Hazaveh, N. Khodabakhshi-Javinani, Ali Bayandour, N. Jalali, Hossein Askarian‐Abyaneh","doi":"10.1109/IPAPS49326.2019.9069375","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069375","url":null,"abstract":"Calculating the time the message sent from the MCPU to the Integrated Radio Consulting Services (MCPU) relay needs to be calculated from the system topology change because of the need or desire for the services provided. The MCPU is best served by using the MCPU to give you the best option that has changed potential locations and is updating.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131387738","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069379
Siamak Bahari, Tohid Hasani, Heresh Sevedi
As the power system expands, the need to provide reliable energy has also increased, consequently. One of the issues that makes this problem difficult is detecting of short circuit faults in the grid under saturated current transformers (CT) condition. In the case of CT saturation, protective relays encounter many problems. This paper presents two new and practical solutions to tackle this problem. Firstly, it is proposed to use a combination of two signal processing indices for detecting CT saturation in the network fault condition. Then, it is suggested to modify the differential protection characteristic to stabilize it against CT saturation. The simulation has been done on modeled real network in EMTDC/PSCAD and its outputs are analyzed using MATLAB. The results of the simulation confirm the efficiency and usefulness of the proposed method for stabilizing the differential protection against CT saturation.
{"title":"A New Stabilizing Method of Differential Protection Against Current Transformer Saturation Using Current Derivatives","authors":"Siamak Bahari, Tohid Hasani, Heresh Sevedi","doi":"10.1109/IPAPS49326.2019.9069379","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069379","url":null,"abstract":"As the power system expands, the need to provide reliable energy has also increased, consequently. One of the issues that makes this problem difficult is detecting of short circuit faults in the grid under saturated current transformers (CT) condition. In the case of CT saturation, protective relays encounter many problems. This paper presents two new and practical solutions to tackle this problem. Firstly, it is proposed to use a combination of two signal processing indices for detecting CT saturation in the network fault condition. Then, it is suggested to modify the differential protection characteristic to stabilize it against CT saturation. The simulation has been done on modeled real network in EMTDC/PSCAD and its outputs are analyzed using MATLAB. The results of the simulation confirm the efficiency and usefulness of the proposed method for stabilizing the differential protection against CT saturation.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128001584","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 : 2019-12-01DOI: 10.1109/ipaps49326.2019.9069372
{"title":"2020 15th International Conference on Protection and Automation of Power Systems (IPAPS)","authors":"","doi":"10.1109/ipaps49326.2019.9069372","DOIUrl":"https://doi.org/10.1109/ipaps49326.2019.9069372","url":null,"abstract":"","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130553227","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069377
A. Abbasi, H. Karegar, T. Aghdam
In this paper, an offline adaptive protection coordination based on Setting Groups (SGs) is proposed to consider the uncertainties in distribution networks. Distributed Generations (DGs) and line outages significantly change the patterns of fault current which results in miss-coordination and non-optimal tripping times. The SGs are systematically assigned based on the impedance matrix to cluster the different operating conditions of grid to a limited number of SGs, using kmeans method. Based on the assigned operating modes to each SG, an optimal coordination is solved to maximize protection system sensitivity, simultaneously preserving the selectivity in case of events like DGs disconnection and line outage. The proposed method is simulated on IEEE 30 Bus and optimum SGs are found using Genetic Algorithm (GA). The results indicate that relays present a robust protection while the selectivity is guaranteed.
{"title":"Optimal Adaptive Protection Using Setting Groups Allocation Based on Impedance Matrix","authors":"A. Abbasi, H. Karegar, T. Aghdam","doi":"10.1109/IPAPS49326.2019.9069377","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069377","url":null,"abstract":"In this paper, an offline adaptive protection coordination based on Setting Groups (SGs) is proposed to consider the uncertainties in distribution networks. Distributed Generations (DGs) and line outages significantly change the patterns of fault current which results in miss-coordination and non-optimal tripping times. The SGs are systematically assigned based on the impedance matrix to cluster the different operating conditions of grid to a limited number of SGs, using kmeans method. Based on the assigned operating modes to each SG, an optimal coordination is solved to maximize protection system sensitivity, simultaneously preserving the selectivity in case of events like DGs disconnection and line outage. The proposed method is simulated on IEEE 30 Bus and optimum SGs are found using Genetic Algorithm (GA). The results indicate that relays present a robust protection while the selectivity is guaranteed.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132759993","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069382
P. Jafarian, A. Agheli
The differential protection of power transformers is prone to incorrect operation in breaker-and-a-half substations if the transformer winding current is provided by paralleling the bay current transformers (CTs). In this paper, a real event of undesired tripping without the presence of CT saturation under fault current flowing through the bay CTs between the substation buses is analyzed and an approach is proposed to remedy the problem. Simulation studies conducted in PSCAD/EMTDC program show that the nominal accuracy errors of CTs under fault currents below the CTs accuracy limit factor (ALF) can cause false differential currents higher than the usual differential relay setting. Using the proposed approach, the restraint current would be able to desirably stabilize the relay during external faults.
{"title":"Improvement of Security of Transformer Differential Protection in Breaker-and-a-Half Substations","authors":"P. Jafarian, A. Agheli","doi":"10.1109/IPAPS49326.2019.9069382","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069382","url":null,"abstract":"The differential protection of power transformers is prone to incorrect operation in breaker-and-a-half substations if the transformer winding current is provided by paralleling the bay current transformers (CTs). In this paper, a real event of undesired tripping without the presence of CT saturation under fault current flowing through the bay CTs between the substation buses is analyzed and an approach is proposed to remedy the problem. Simulation studies conducted in PSCAD/EMTDC program show that the nominal accuracy errors of CTs under fault currents below the CTs accuracy limit factor (ALF) can cause false differential currents higher than the usual differential relay setting. Using the proposed approach, the restraint current would be able to desirably stabilize the relay during external faults.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121974971","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 : 2019-12-01DOI: 10.1109/IPAPS49326.2019.9069376
Behrooz Taheri, S. A. Hosseini, Sims Salehimehr
Inrush currents are over currents that occur during the switching of power transformers. Differential relays can misidentify these currents as a fault and needlessly disconnect a healthy transformer. The typical methods for detecting inrush currents and blocking the function of differential relays are the second harmonic and zero-crossing methods, which are widely used in differential relays. However, these methods have several weaknesses that limit their applicability. This paper presents a new inrush current detection method based on the rate of change in the signal energy. The proposed method has been tested on a 230/63kV network with Ynd11 current transformer and compared with conventional industrial methods for different inrush currents and transformer internal faults.
{"title":"An Energy Variation-Based Method for Discrimination Between the Internal Fault and Inrush Current in Power Transformers","authors":"Behrooz Taheri, S. A. Hosseini, Sims Salehimehr","doi":"10.1109/IPAPS49326.2019.9069376","DOIUrl":"https://doi.org/10.1109/IPAPS49326.2019.9069376","url":null,"abstract":"Inrush currents are over currents that occur during the switching of power transformers. Differential relays can misidentify these currents as a fault and needlessly disconnect a healthy transformer. The typical methods for detecting inrush currents and blocking the function of differential relays are the second harmonic and zero-crossing methods, which are widely used in differential relays. However, these methods have several weaknesses that limit their applicability. This paper presents a new inrush current detection method based on the rate of change in the signal energy. The proposed method has been tested on a 230/63kV network with Ynd11 current transformer and compared with conventional industrial methods for different inrush currents and transformer internal faults.","PeriodicalId":230294,"journal":{"name":"2020 14th International Conference on Protection and Automation of Power Systems (IPAPS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129855506","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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