Pub Date : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740388
R. Benato, A. Chiarelli, S. Sessa
The current scenario of continuous and increasing production of energy from renewable sources and the progressive increase of interties between different countries, gives the high voltage direct current transmission lines (HVDC) a role of present and future protagonist in the electrical power transmission. One of the main issues concerning the HVDC systems is the effect of the transient overvoltages (TOV) which occur during fault conditions on the DC side of a HVDC link. In fact, even if power cables are tested in order to withstand overvoltages with standardized characteristics, the real TOV phenomena do not have standard features. In this paper, the analysis of the TOVs of a HVDC symmetrical monopolar configuration is carried out, by studying the TOV propagation along the cable line and by defining step by step the overvoltage trend for different fault sections. Moreover, by means of a probability study, the most stressed points along the cable are identified by taking into account all the possible fault positions, so to highlight which are the more critical positions of the cable system irrespective of the fault section.
{"title":"Transient Overvoltage Analysis in HVDC MMC Power Cables: Assessment of the Critical Points","authors":"R. Benato, A. Chiarelli, S. Sessa","doi":"10.1109/AEIT-HVDC.2019.8740388","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740388","url":null,"abstract":"The current scenario of continuous and increasing production of energy from renewable sources and the progressive increase of interties between different countries, gives the high voltage direct current transmission lines (HVDC) a role of present and future protagonist in the electrical power transmission. One of the main issues concerning the HVDC systems is the effect of the transient overvoltages (TOV) which occur during fault conditions on the DC side of a HVDC link. In fact, even if power cables are tested in order to withstand overvoltages with standardized characteristics, the real TOV phenomena do not have standard features. In this paper, the analysis of the TOVs of a HVDC symmetrical monopolar configuration is carried out, by studying the TOV propagation along the cable line and by defining step by step the overvoltage trend for different fault sections. Moreover, by means of a probability study, the most stressed points along the cable are identified by taking into account all the possible fault positions, so to highlight which are the more critical positions of the cable system irrespective of the fault section.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129072701","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740466
L. Michi, E. Carlini, T. B. Scirocco, G. Bruno, R. Gnudi, C. Pisani, M. Salvetti, D. Macalli
This paper describes the studies performed by Italian TSO Terna, together with CESI, about feasibility of power system restoration strategies including HVDC links. The recent European Regulations ask for the design and implementation of proper restoration plans, considering all the generation, load capabilities and network characteristics. In the Italian power system, Sardinian network relies on several restoration paths. Indeed, the island is also connected to Italian peninsula through two HVDCs, SA.PE.I and SA.CO.I, the last of which is also a multi-terminal link connecting French island of Corsica. In light of this scenario, the paper firstly presents the outcomes of the preparatory investigations and later provides the results of five major restoration tests, performed between 2015 and 2017. Future trends in a context of continuous restoration plan update are also provided
{"title":"The restoration field tests in Sardinian network involving HVDC, synchronous condensers and hydraulic power plant","authors":"L. Michi, E. Carlini, T. B. Scirocco, G. Bruno, R. Gnudi, C. Pisani, M. Salvetti, D. Macalli","doi":"10.1109/AEIT-HVDC.2019.8740466","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740466","url":null,"abstract":"This paper describes the studies performed by Italian TSO Terna, together with CESI, about feasibility of power system restoration strategies including HVDC links. The recent European Regulations ask for the design and implementation of proper restoration plans, considering all the generation, load capabilities and network characteristics. In the Italian power system, Sardinian network relies on several restoration paths. Indeed, the island is also connected to Italian peninsula through two HVDCs, SA.PE.I and SA.CO.I, the last of which is also a multi-terminal link connecting French island of Corsica. In light of this scenario, the paper firstly presents the outcomes of the preparatory investigations and later provides the results of five major restoration tests, performed between 2015 and 2017. Future trends in a context of continuous restoration plan update are also provided","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122794287","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740649
F. Gatta, A. Geri, S. Lauria, M. Maccioni, L. Buono, M. Marzinotto, F. Palone, M. Rebolini
The existing Sardinia-Corsica-Italy (SaCoI) multiterminal HVDC link, commissioned in 1990, will be refurbished by Terna in the next years, due to ageing and technological obsolescence. The possible technical solutions were investigated by Terna and Sapienza University. The paper deals with the comparison of three alternative solutions for the SaCoI, using either direct current or alternating current: results evidence that both alternatives are theoretically feasible, although with different advantages and disadvantages.
{"title":"Possible technical solutions for the new Sardinia-Corsica-Italy link","authors":"F. Gatta, A. Geri, S. Lauria, M. Maccioni, L. Buono, M. Marzinotto, F. Palone, M. Rebolini","doi":"10.1109/AEIT-HVDC.2019.8740649","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740649","url":null,"abstract":"The existing Sardinia-Corsica-Italy (SaCoI) multiterminal HVDC link, commissioned in 1990, will be refurbished by Terna in the next years, due to ageing and technological obsolescence. The possible technical solutions were investigated by Terna and Sapienza University. The paper deals with the comparison of three alternative solutions for the SaCoI, using either direct current or alternating current: results evidence that both alternatives are theoretically feasible, although with different advantages and disadvantages.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115260361","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740652
L. Michi, E. Carlini, G. Donnini, G. Giannuzzi, M. Renieri, R. Zaottini, C. Pisani, B. Aluisio, A. Urbanelli, C. Vergine
System dynamic response and related phenomena drastically changed in last ten years; this is a consequence of different factors: the very fast development of inverter based generation, the increase of distributed resources, the gradual decarbonization of generation mix and, at last, the change of load behaviour both in amplitude and distribution. The paper explores the more pragmatic effects over the grid due to this fast evolution and the actions and challenges in charge of the System Operators with a detailed focus on Italian initiatives.
{"title":"System dynamic behaviour challenges: operating experience and future trends","authors":"L. Michi, E. Carlini, G. Donnini, G. Giannuzzi, M. Renieri, R. Zaottini, C. Pisani, B. Aluisio, A. Urbanelli, C. Vergine","doi":"10.1109/AEIT-HVDC.2019.8740652","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740652","url":null,"abstract":"System dynamic response and related phenomena drastically changed in last ten years; this is a consequence of different factors: the very fast development of inverter based generation, the increase of distributed resources, the gradual decarbonization of generation mix and, at last, the change of load behaviour both in amplitude and distribution. The paper explores the more pragmatic effects over the grid due to this fast evolution and the actions and challenges in charge of the System Operators with a detailed focus on Italian initiatives.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133546732","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740396
A. Iaria, R. Calisti, A. L'Abbate, M. Rapizza
The refurbishment of the three-terminal HVDC (High Voltage Direct Current) link SA.CO.I.2 is an interesting study case in terms of possible techno-economic benefits and improved Sardinian system flexibility for operational security that can be provided by the interconnector. The present paper firstly investigates the key techno-economic benefits, evaluated by the application of a OPF (Optimal Power Flow)-based market simulator for zonal analyses. Starting from the optimized power schedules and generation unit commitment, main focus is on the Sardinian system flexibility adequacy that is verified by means of the comparison between the power reserve margins availability and the operational security requirements. The results provide indexes of the effectiveness that the new infrastructure may have on the Sardinian system in a 2030 time horizon in line with the scenario assumptions of the Italian National Energy Strategy.
{"title":"Impact of SA.CO.I. refurbishment: flexibility analysis of the Sardinian system","authors":"A. Iaria, R. Calisti, A. L'Abbate, M. Rapizza","doi":"10.1109/AEIT-HVDC.2019.8740396","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740396","url":null,"abstract":"The refurbishment of the three-terminal HVDC (High Voltage Direct Current) link SA.CO.I.2 is an interesting study case in terms of possible techno-economic benefits and improved Sardinian system flexibility for operational security that can be provided by the interconnector. The present paper firstly investigates the key techno-economic benefits, evaluated by the application of a OPF (Optimal Power Flow)-based market simulator for zonal analyses. Starting from the optimized power schedules and generation unit commitment, main focus is on the Sardinian system flexibility adequacy that is verified by means of the comparison between the power reserve margins availability and the operational security requirements. The results provide indexes of the effectiveness that the new infrastructure may have on the Sardinian system in a 2030 time horizon in line with the scenario assumptions of the Italian National Energy Strategy.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115183927","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740550
S. Sessa, A. Chiarelli, A. L'Abbate, R. Benato
In this paper, an overview of the most effective availability assessment methods, applicable to HVDC (High Voltage Direct Current) transmission systems, is presented. The aim of this work is to give a guideline to orientate users in the choice of the best availability estimation approach on the basis of the influence variables which need to be considered. The theoretical fundamentals of each method have been described in order to highlight the limits and the potentiality of each approach for HVDC system applications.
{"title":"Availability Assessment Methods for HVDC Systems: a Review","authors":"S. Sessa, A. Chiarelli, A. L'Abbate, R. Benato","doi":"10.1109/AEIT-HVDC.2019.8740550","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740550","url":null,"abstract":"In this paper, an overview of the most effective availability assessment methods, applicable to HVDC (High Voltage Direct Current) transmission systems, is presented. The aim of this work is to give a guideline to orientate users in the choice of the best availability estimation approach on the basis of the influence variables which need to be considered. The theoretical fundamentals of each method have been described in order to highlight the limits and the potentiality of each approach for HVDC system applications.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128096143","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740647
M. Marchesoni, M. Passalacqua, L. Vaccaro, M. Carpita, S. Gavin, S. Kissling
In this paper an exhaustive study on the effects of the circulating currents in the modular multilevel converter in HVDC applications is presented. In the first part, an analytical study of the converter is reported, with emphasis on the capacitors voltage ripple in presence of different circulating currents. In particular, the effects of the second and fourth harmonic components in the circulating current are evaluated in a general working point and, in particular, in the more significant working points corresponding to the inverter, rectifier, inductive and capacitive operation modes. The second part is a simulated HVDC plant verification of the voltage capacitor ripple expression.
{"title":"Capacitor Voltage Ripple Minimization in Voltage Source Converter for HVDC Applications","authors":"M. Marchesoni, M. Passalacqua, L. Vaccaro, M. Carpita, S. Gavin, S. Kissling","doi":"10.1109/AEIT-HVDC.2019.8740647","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740647","url":null,"abstract":"In this paper an exhaustive study on the effects of the circulating currents in the modular multilevel converter in HVDC applications is presented. In the first part, an analytical study of the converter is reported, with emphasis on the capacitors voltage ripple in presence of different circulating currents. In particular, the effects of the second and fourth harmonic components in the circulating current are evaluated in a general working point and, in particular, in the more significant working points corresponding to the inverter, rectifier, inductive and capacitive operation modes. The second part is a simulated HVDC plant verification of the voltage capacitor ripple expression.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114482852","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740577
C. Mosca, E. Bompard, B. Aluisio, M. Migliori, C. Vergine, P. Cuccia
High Voltage Direct Current (HVDC) transmission has been increasingly deployed in modern power systems, over long distances in asynchronous interconnections and offshore wind integration, due to lower investment costs, lower losses and higher controllability. Nevertheless, they cannot provide inherently inertia and frequency support, without the adoption of appropriate control strategies. With the increase of renewable generation interfaced by power electronics and the gradual phaseout of conventional power plants, frequency stability management is becoming a great challenge, particularly in small size islanded and asynchronously interconnected power systems. In this paper, we investigate the possibility of controlling a HVDC to support frequency stability providing primary regulation in future scenarios. We present and discuss the opportunities provided by a HVDC, using an aggregate generation-load model, to the frequency regulation of the Sardinia island in Italy also in the light of the trilateral interconnection between Sardinia, Sicily and Italian Peninsula. Simulations show that the HVDC can assure the frequency stability of the Sardinian power system, if primary control strategies are deployed.
{"title":"HVDC for frequency stability under RES penetration: the Sardinia island case","authors":"C. Mosca, E. Bompard, B. Aluisio, M. Migliori, C. Vergine, P. Cuccia","doi":"10.1109/AEIT-HVDC.2019.8740577","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740577","url":null,"abstract":"High Voltage Direct Current (HVDC) transmission has been increasingly deployed in modern power systems, over long distances in asynchronous interconnections and offshore wind integration, due to lower investment costs, lower losses and higher controllability. Nevertheless, they cannot provide inherently inertia and frequency support, without the adoption of appropriate control strategies. With the increase of renewable generation interfaced by power electronics and the gradual phaseout of conventional power plants, frequency stability management is becoming a great challenge, particularly in small size islanded and asynchronously interconnected power systems. In this paper, we investigate the possibility of controlling a HVDC to support frequency stability providing primary regulation in future scenarios. We present and discuss the opportunities provided by a HVDC, using an aggregate generation-load model, to the frequency regulation of the Sardinia island in Italy also in the light of the trilateral interconnection between Sardinia, Sicily and Italian Peninsula. Simulations show that the HVDC can assure the frequency stability of the Sardinian power system, if primary control strategies are deployed.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130720270","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740556
M. Migliori, S. Lauria, L. Michi, G. Donnini, B. Aluisio, C. Vergine
Along the Adriatic coast, the Italian transmission system consists of a single 400 kV North-South Line. This limits the power transfer capacity between the Center North and Center South market zones and with the risk of overload in case of high renewable generation in Southern Italy. The year 2019 Network Development Plan foresaw the installation of a submarine High Voltage Direct Current (HVDC) line between the Fano (Center North) and Villanova (Center South) substations, in order to overcome environmental and social constrains and allow a full integration of Southern renewable sources. This paper presents an evaluation of the operating limits of a specific portion of the Adriatic 400 kV backbone, both in its current configuration and after the installation of the new HVDC link.
{"title":"Renewable sources integration using HVDC in parallel to AC traditional system: the Adriatic project","authors":"M. Migliori, S. Lauria, L. Michi, G. Donnini, B. Aluisio, C. Vergine","doi":"10.1109/AEIT-HVDC.2019.8740556","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740556","url":null,"abstract":"Along the Adriatic coast, the Italian transmission system consists of a single 400 kV North-South Line. This limits the power transfer capacity between the Center North and Center South market zones and with the risk of overload in case of high renewable generation in Southern Italy. The year 2019 Network Development Plan foresaw the installation of a submarine High Voltage Direct Current (HVDC) line between the Fano (Center North) and Villanova (Center South) substations, in order to overcome environmental and social constrains and allow a full integration of Southern renewable sources. This paper presents an evaluation of the operating limits of a specific portion of the Adriatic 400 kV backbone, both in its current configuration and after the installation of the new HVDC link.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126120182","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 : 2019-05-01DOI: 10.1109/AEIT-HVDC.2019.8740439
U. Vercellotti
The World energy consumption and the power generation to match it are set to continue to rise for the foreseeable future. Unfortunately, the bulk of the Energy resources needed to satisfy rising demands are not located near the load centers. For submarine and lengthy land cables, HVDC systems offer key advantages including higher capacity, reduced losses, no need for capacitive charging currents and better control over both load flow and reactive power transmission. A number of interconnections from mainland to islands and long undersea applications have been realized to allow different types of energy sources to connect together to boost security of supply. In EU, Projects of common interest (PCIs) were introduced as key infrastructure projects, especially cross-border projects, that link EU energy systems. Germany, with its central location in EU and increasing electricity demand, is expected to promote interconnections between neighboring countries, thereby supporting the growth of worldwide's HVDC cables market. In particular the German Transmission System Operators (GTSO), in the frame of the Energiewende, are now looking for the first set of cable manufacturers able to supply at least 3000km of 525 kVdc extruded cables systems CESI is deeply involved in this process with 4 cables lines under tests in the first third party worldwide laboratory in Mannheim, Germany. This paper highlights the experience gained during the first Long Duration Tests (PQT) performed in both lab and outdoor situations on 525kV DC cable systems.
{"title":"HVDC links at increased voltage, CESI experience on extruded cable systems up to 525kV","authors":"U. Vercellotti","doi":"10.1109/AEIT-HVDC.2019.8740439","DOIUrl":"https://doi.org/10.1109/AEIT-HVDC.2019.8740439","url":null,"abstract":"The World energy consumption and the power generation to match it are set to continue to rise for the foreseeable future. Unfortunately, the bulk of the Energy resources needed to satisfy rising demands are not located near the load centers. For submarine and lengthy land cables, HVDC systems offer key advantages including higher capacity, reduced losses, no need for capacitive charging currents and better control over both load flow and reactive power transmission. A number of interconnections from mainland to islands and long undersea applications have been realized to allow different types of energy sources to connect together to boost security of supply. In EU, Projects of common interest (PCIs) were introduced as key infrastructure projects, especially cross-border projects, that link EU energy systems. Germany, with its central location in EU and increasing electricity demand, is expected to promote interconnections between neighboring countries, thereby supporting the growth of worldwide's HVDC cables market. In particular the German Transmission System Operators (GTSO), in the frame of the Energiewende, are now looking for the first set of cable manufacturers able to supply at least 3000km of 525 kVdc extruded cables systems CESI is deeply involved in this process with 4 cables lines under tests in the first third party worldwide laboratory in Mannheim, Germany. This paper highlights the experience gained during the first Long Duration Tests (PQT) performed in both lab and outdoor situations on 525kV DC cable systems.","PeriodicalId":186931,"journal":{"name":"2019 AEIT HVDC International Conference (AEIT HVDC)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123543825","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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