Pub Date : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474590
Julian Lange, Rolf Neubert, Bastian Alt, V. Hussennether, Marcos Gimenes Christianini de Abreu
A highly experienced level of quality testing capabilities for HVDC converters is one of the key pre-requisites in guaranteeing operational reliability and availability of HVDC transmission schemes. In this paper we combine both aspects by introducing the testing capabilities of a newly installed Power Converter Test Center together with an overview of reliability and availability of HVDC projects in operation.
{"title":"Innovative Converter Testing Technology and Overall Reliability and Availability Performance of HVDC Solutions","authors":"Julian Lange, Rolf Neubert, Bastian Alt, V. Hussennether, Marcos Gimenes Christianini de Abreu","doi":"10.1109/AEITHVDC52364.2021.9474590","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474590","url":null,"abstract":"A highly experienced level of quality testing capabilities for HVDC converters is one of the key pre-requisites in guaranteeing operational reliability and availability of HVDC transmission schemes. In this paper we combine both aspects by introducing the testing capabilities of a newly installed Power Converter Test Center together with an overview of reliability and availability of HVDC projects in operation.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117112149","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474598
D. Lauria, F. Mottola, C. Pisani, Francesco Del Pizzo, E. Carlini, G. Giannuzzi
The forced switching converters are the kernel of the modern paradigm of VSC-HVDC system. It is widely recognized that appropriate control laws make these converters more advantageous than the traditional line commutated ones. They can play a versatile role by properly controlling active and reactive powers between electrical networks, improving the dynamic performances of the whole system. Besides this is more and more motivated by the wide spreading penetration of renewable resources. In this paper after a few references to basic concepts, a possible control strategy of VSC-HVDC transmission system is discussed. With respect to a two-area system with AC-DC link, a combined control law is investigated for improving inertial and primary frequency response. The control law is based upon the equivalent HVDC tie link synchronization coefficient which allows determining the reference value of the AC voltage reference angles of the converters. A damping action is further added for improving the power swings damping. The simulations performed with a simple but quite general case study permit to confirm the validity and the goodness of the proposed control strategy.
{"title":"HVDC tie links in smart power grids: a versatile control strategy of VSC converters","authors":"D. Lauria, F. Mottola, C. Pisani, Francesco Del Pizzo, E. Carlini, G. Giannuzzi","doi":"10.1109/AEITHVDC52364.2021.9474598","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474598","url":null,"abstract":"The forced switching converters are the kernel of the modern paradigm of VSC-HVDC system. It is widely recognized that appropriate control laws make these converters more advantageous than the traditional line commutated ones. They can play a versatile role by properly controlling active and reactive powers between electrical networks, improving the dynamic performances of the whole system. Besides this is more and more motivated by the wide spreading penetration of renewable resources. In this paper after a few references to basic concepts, a possible control strategy of VSC-HVDC transmission system is discussed. With respect to a two-area system with AC-DC link, a combined control law is investigated for improving inertial and primary frequency response. The control law is based upon the equivalent HVDC tie link synchronization coefficient which allows determining the reference value of the AC voltage reference angles of the converters. A damping action is further added for improving the power swings damping. The simulations performed with a simple but quite general case study permit to confirm the validity and the goodness of the proposed control strategy.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131117511","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474620
C. Buccella, M. G. Cimoroni, Carlo Cecati
This paper proposes the application of a mixed selective harmonic elimination mitigation modulation algorithm to three-phase HVDC modular multilevel converters. Defining 1 the number of levels, two cases have been considered: t=65 and t=257. While operating at the fundamental switching frequency, the algorithm returns those solutions, expressed in terms of switching angles to be applied to power devices, which allow complete elimination of a subset of low order harmonics and the mitigation of others. Simulation results show harmonic analysis graphs and total harmonic distortion at different modulation indexes and demonstrate the feasibility of the proposed system.
{"title":"Selective Harmonic Elimination Modulation for HVDC Modular Multilevel Converter","authors":"C. Buccella, M. G. Cimoroni, Carlo Cecati","doi":"10.1109/AEITHVDC52364.2021.9474620","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474620","url":null,"abstract":"This paper proposes the application of a mixed selective harmonic elimination mitigation modulation algorithm to three-phase HVDC modular multilevel converters. Defining 1 the number of levels, two cases have been considered: t=65 and t=257. While operating at the fundamental switching frequency, the algorithm returns those solutions, expressed in terms of switching angles to be applied to power devices, which allow complete elimination of a subset of low order harmonics and the mitigation of others. Simulation results show harmonic analysis graphs and total harmonic distortion at different modulation indexes and demonstrate the feasibility of the proposed system.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115089974","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474618
R. Benato, S. Sessa, G. Gardan, A. L'Abbate
Several contributions in technical literature highlight the potential offered by the conversion of an existing HVAC overhead line into a HVDC one. In the context of the world's energy transition from fossil fuel-based to higher and higher renewable energy sources power generation, the HVAC-to-HVDC overhead line conversion is an option that deserves to be considered. In fact, without withdrawing further land resources, it is possible to increase the transmitted power significantly by exploiting the existing corridors. In this paper, an overview of the main issues to be considered when converting a HVAC lines into a HVDC one is presented, by describing technical, economical and environmental features in order to achieve the maximum benefits from this conversion. Moreover, some investigations about ongoing projects and studies around the world are reported.
{"title":"Converting Overhead Lines from HVAC to HVDC: an Overview Analysis","authors":"R. Benato, S. Sessa, G. Gardan, A. L'Abbate","doi":"10.1109/AEITHVDC52364.2021.9474618","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474618","url":null,"abstract":"Several contributions in technical literature highlight the potential offered by the conversion of an existing HVAC overhead line into a HVDC one. In the context of the world's energy transition from fossil fuel-based to higher and higher renewable energy sources power generation, the HVAC-to-HVDC overhead line conversion is an option that deserves to be considered. In fact, without withdrawing further land resources, it is possible to increase the transmitted power significantly by exploiting the existing corridors. In this paper, an overview of the main issues to be considered when converting a HVAC lines into a HVDC one is presented, by describing technical, economical and environmental features in order to achieve the maximum benefits from this conversion. Moreover, some investigations about ongoing projects and studies around the world are reported.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115952951","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474605
G. Rizzo, P. Romano, A. Imburgia, M. Albertini, S. F. Bononi, S. Siripurapu, G. Ala
Rapid growth of HVDC cable line installations is expected in the coming years. Several research groups have investigated dielectric phenomena that occur in the insulation of HVDC cables and accessories that accelerate aging and reduce the reliability of this technology over time. Unlike in HVAC cables, under HVDC stress, the distribution of the electric field inside the insulation layer depends not only on the applied voltage but also on the temperature distribution and on other factors related to manufacturing such as the presence of impurities. Reaching local and transient electric field peaks can enhance the onset of Partial Discharges (PDs) which can lead to premature aging of the insulation. As demonstrated by several studies, the achievement of electric field peaks that can exceed the inception level for partial discharges is more likely in joints. This is due both to the greater probability that a defect is incorporated in two different dielectric layers, and to the greater thickness which determines a higher temperature drop. In this paper, the occurrence of PDs inception conditions in a void inside an HVDC joint during a Transient Over Voltage (TOV) event is investigated by means of FEM simulations. This type of event can be considered as one of the most severe from the point of view of the occurrence of partial discharges as the effect of the rapid variation of applied voltage is combined with the previously established electric field distribution due to the space charge accumulation.
{"title":"The effect of Transient Over Voltages on the Partial Discharges activity in HVDC joints","authors":"G. Rizzo, P. Romano, A. Imburgia, M. Albertini, S. F. Bononi, S. Siripurapu, G. Ala","doi":"10.1109/AEITHVDC52364.2021.9474605","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474605","url":null,"abstract":"Rapid growth of HVDC cable line installations is expected in the coming years. Several research groups have investigated dielectric phenomena that occur in the insulation of HVDC cables and accessories that accelerate aging and reduce the reliability of this technology over time. Unlike in HVAC cables, under HVDC stress, the distribution of the electric field inside the insulation layer depends not only on the applied voltage but also on the temperature distribution and on other factors related to manufacturing such as the presence of impurities. Reaching local and transient electric field peaks can enhance the onset of Partial Discharges (PDs) which can lead to premature aging of the insulation. As demonstrated by several studies, the achievement of electric field peaks that can exceed the inception level for partial discharges is more likely in joints. This is due both to the greater probability that a defect is incorporated in two different dielectric layers, and to the greater thickness which determines a higher temperature drop. In this paper, the occurrence of PDs inception conditions in a void inside an HVDC joint during a Transient Over Voltage (TOV) event is investigated by means of FEM simulations. This type of event can be considered as one of the most severe from the point of view of the occurrence of partial discharges as the effect of the rapid variation of applied voltage is combined with the previously established electric field distribution due to the space charge accumulation.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122522672","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474629
S. Barsali, M. Ceraolo, P. Pelacchi, L. Sani
This paper analyses the possibility to black-start a remote area using an existing Line Commutated Converter HVDC link.To do this, a relatively small size Voltage Sourced Converter must be installed at the link receiving-end. The black start takes place using the existing receiving end network and line commutated converters, and the DC line. The paper shows that the black start operation can take place fast and effectively.
{"title":"Black-start of remote areas through SCR-based HVDC Links","authors":"S. Barsali, M. Ceraolo, P. Pelacchi, L. Sani","doi":"10.1109/AEITHVDC52364.2021.9474629","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474629","url":null,"abstract":"This paper analyses the possibility to black-start a remote area using an existing Line Commutated Converter HVDC link.To do this, a relatively small size Voltage Sourced Converter must be installed at the link receiving-end. The black start takes place using the existing receiving end network and line commutated converters, and the DC line. The paper shows that the black start operation can take place fast and effectively.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133763750","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 : 2021-05-27DOI: 10.1109/AEITHVDC52364.2021.9474603
R. Benato, A. Chiarelli, S. Sessa, G. Giannuzzi, C. Pisani, R. Zaottini
The paper presents an electromagnetic-transient (EMT) analysis of a multi-infeed HVDC cable system in order to assess the transient overvoltages on the cables due to different fault conditions. It is well known that the HVDC-MMC configuration needs surge arresters to reduce the transient overvoltages on the DC cable system. This work highlights how the voltage perturbations on the HVDC-LCC link due to the faults on the HVDC-MMC link are not negligible and how a reduction of transient overvoltage is necessary for both the HVDC systems. The results of this study can be useful to improve the insulation coordination of the multi-infeed HVDC system and their reliable operation.
{"title":"A Multi-infeed HVDC System: Assessment of Transient Overvoltages","authors":"R. Benato, A. Chiarelli, S. Sessa, G. Giannuzzi, C. Pisani, R. Zaottini","doi":"10.1109/AEITHVDC52364.2021.9474603","DOIUrl":"https://doi.org/10.1109/AEITHVDC52364.2021.9474603","url":null,"abstract":"The paper presents an electromagnetic-transient (EMT) analysis of a multi-infeed HVDC cable system in order to assess the transient overvoltages on the cables due to different fault conditions. It is well known that the HVDC-MMC configuration needs surge arresters to reduce the transient overvoltages on the DC cable system. This work highlights how the voltage perturbations on the HVDC-LCC link due to the faults on the HVDC-MMC link are not negligible and how a reduction of transient overvoltage is necessary for both the HVDC systems. The results of this study can be useful to improve the insulation coordination of the multi-infeed HVDC system and their reliable operation.","PeriodicalId":403034,"journal":{"name":"2021 AEIT HVDC International Conference (AEIT HVDC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128667791","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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