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Effect of Short-Circuit Ratio and Current Limiting on the Stability of a Virtual Synchronous Machine Type Gridforming Converter 短路比和限流对虚拟同步机型网格变换器稳定性的影响
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2466
A. Darbandi, A. Sinkar, A. Gole
{"title":"Effect of Short-Circuit Ratio and Current Limiting on the Stability of a Virtual Synchronous Machine Type Gridforming Converter","authors":"A. Darbandi, A. Sinkar, A. Gole","doi":"10.1049/icp.2021.2466","DOIUrl":"https://doi.org/10.1049/icp.2021.2466","url":null,"abstract":"This paper analyzes the impact of ac system strength on the stability of a virtual synchronous machine (VSM) type grid-forming converter. A grid-forming VSM without additional control loops, such as overcurrent limiting, is first considered and used as a reference for comparison with a more realistic VSM with current limiting control loops. A small-signal model of the system is developed for both cases. The models are validated by comparing their transient responses with a detailed electromagnetic transient (EMT) simulation. Subsequent analysis using the developed small-signal model shows that a VSM type grid-forming converter with current limiting capability exhibits poorer damping when the connected ac network has a high short-circuit ratio (SCR). This poor damping arises from the addition of the current control loop. The paper will show that when the current controller is absent, the SCR of the ac network has minimal impact on the stability behavior of the VSM.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114456435","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}
引用次数: 3
PROTECTION OF LVDC NETWORKS INTEGRATING SMART TRANSFORMERS: THE CASE OF LV ENGINE FALKIRK TRIAL SITE 集成智能变压器的LVDC网络保护:以低压发动机福尔柯克试验场为例
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2470
V. Psaras, Rafael Peña-Alzola, I. Abdulhadi, Graeme Burt, Ali, Kazerooni, F. Shillitoe, Michael Eves, James Yu
{"title":"PROTECTION OF LVDC NETWORKS INTEGRATING SMART TRANSFORMERS: THE CASE OF LV ENGINE FALKIRK TRIAL SITE","authors":"V. Psaras, Rafael Peña-Alzola, I. Abdulhadi, Graeme Burt, Ali, Kazerooni, F. Shillitoe, Michael Eves, James Yu","doi":"10.1049/icp.2021.2470","DOIUrl":"https://doi.org/10.1049/icp.2021.2470","url":null,"abstract":"To enhance the adaptability of low voltage (LV) networks and release additional network capacity towards enabling the wider uptake of low carbon technologies, SP Energy Network’s (SPEN) LV Engine project aims to design and trial the first UK solid state transformer (SST) for deployment within secondary substations (11/0.4kV). The trial site at Falkirk Stadium that is aimed to be completed in the near future will form the first LVDC trial at a utility scale in the UK. The SST and the introduction of low voltage DC (LVDC) supplies will present fundamental changes in the operation of existing secondary substations and will introduce new LV fault profiles for the associated LVDC distribution networks. This paper presents the results of joint work between the University of Strathclyde, SPEN and WSP with the primary objectives to understand the impact of SST deployment on the fault behaviour of LVDC networks and develop adequate protection strategies for LV Engine LVDC trial sites.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132914242","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}
引用次数: 0
ESTIMATION OF SYMMETRICAL COMPONENTS WITH FAST DYNAMICS FOR VSC-HVDC
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2439
P. Briff
{"title":"ESTIMATION OF SYMMETRICAL COMPONENTS WITH FAST DYNAMICS FOR VSC-HVDC","authors":"P. Briff","doi":"10.1049/icp.2021.2439","DOIUrl":"https://doi.org/10.1049/icp.2021.2439","url":null,"abstract":"This work presents an innovative symmetrical components estimation algorithm for three-phase ac systems by transforming the time-domain voltages into the complex variable domain. The symmetrical components estimation is attained without the need of a phase-locked loop (PLL). Moreover, as opposed to the standard PLL approach, the estimation of ac frequency and phase is decoupled in this work. The proposed method outperforms a standard PLL in terms of its open-loop phase step response. Furthermore, the estimated phase angle generated by the proposed method has been used to successfully control a VSC-HVDC scheme during steady-state and transient operating conditions in a computer simulation environment. In summary, the proposed method presents an efficient mechanism to generate a reliable ac phase estimation under fast dynamics of the ac system voltage, with minimal computational effort, for VSC-HVDC converters connected to weak ac grids.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130112633","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}
引用次数: 0
Test Case: Modular SSSC and LCC-based HVDC Link Technical Synergies 测试案例:模块化SSSC和基于lcc的HVDC链路技术协同
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2471
S. Hincapié, C. A. Ordonez, M. Patiño, A. Duque
{"title":"Test Case: Modular SSSC and LCC-based HVDC Link Technical Synergies","authors":"S. Hincapié, C. A. Ordonez, M. Patiño, A. Duque","doi":"10.1049/icp.2021.2471","DOIUrl":"https://doi.org/10.1049/icp.2021.2471","url":null,"abstract":"This paper assesses the technical benefits that series FACTS (Flexible Alternating Current Transmission System) devices can provide to support the technical challenges when LCC-based HVDC links are connected to weak nodes. A state-of-the-art Modular Static Synchronous Series Compensators (M-SSSC) application is studied in detail. The analysis is supported with a set of simulations in DIgSILENT PowerFactory®, comparing HVDC-LCC link performance with and without M-SSSC.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131412901","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}
引用次数: 1
Providing Synchronous Grid Forming Capability through HVDC Transmission 通过高压直流输电提供同步电网形成能力
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2462
C. Barker, A. Adamczyk, J. Fradley, O. Jasim
{"title":"Providing Synchronous Grid Forming Capability through HVDC Transmission","authors":"C. Barker, A. Adamczyk, J. Fradley, O. Jasim","doi":"10.1049/icp.2021.2462","DOIUrl":"https://doi.org/10.1049/icp.2021.2462","url":null,"abstract":"A comparison of energy storage in a High Voltage Direct Current (HVDC) Voltage-Sourced Converter (VSC) to that of a synchronous machine is made to define the important differences in terms of ac system frequency dependence. The dependence of dynamic synchronising power availability from a VSC on the converter’s internal ac voltage magnitude and hence reactive power supply or consumption is reviewed and then a description of the transfer mechanism of synchronising power from one ac system to another via a HVDC link is explained. EMT simulation results show the expected response of the various components associated with HVDC VSC transmission and explore the variation in response to a small synchronising power demand.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122223094","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}
引用次数: 0
Dynamic studies on HVDC-OWF systems - Impact of WTG on HVDC performances HVDC- owf系统的动态研究——WTG对HVDC性能的影响
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2452
H. Saad, M. V. Dem Berge, B. Marshall, O. Adeuyi, R. Pabat-Stroe
{"title":"Dynamic studies on HVDC-OWF systems - Impact of WTG on HVDC performances","authors":"H. Saad, M. V. Dem Berge, B. Marshall, O. Adeuyi, R. Pabat-Stroe","doi":"10.1049/icp.2021.2452","DOIUrl":"https://doi.org/10.1049/icp.2021.2452","url":null,"abstract":"Transmission connections to offshore wind farm (OWF) typically consist of multiple technologies supplied by different manufacturers each tested separately at the factory, but there is no composite modelling and testing capability currently available in Great Britain, for complex designs and combined solutions. This paper provides an overview on control sensitivity of the dynamic performance of an HVDC-OWF system. A generic but realistic HVDC-OWF test case is used. In order to study the impact of OWF on HVDC dynamic performance, four WTG models (generic and manufacturer black-boxed models) are simulated in the EMT-type tool. In addition, frequency response of the HVDC-OWF system after load rejection is studied to show the importance of control coordination between HVDC and OWF control tuning and the need of combined solution to ensure good performance and stable system. This discussion in turn highlights to both manufactures and vendors the critical areas of compliance demonstration needed across devices and their considerations. It illustrates the need for “sandbox” design and test environments to be established where a projects' designs are respectively defined and combined across devices at various points within the detailed design, individual factory test and commissioning phases of a projects' life-cycle.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126852560","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}
引用次数: 0
Passivity-Based Sensitivity Analysis regarding Control Structures in Grid-Following MMC-HVdc Applications 基于无源性的电网跟随MMC-HVdc控制结构灵敏度分析
The 17th International Conference on AC and DC Power Transmission (ACDC 2021) Pub Date : 1900-01-01 DOI: 10.1049/icp.2021.2441
C. Hirsching, A. Bisseling, S. Wenig, M. Goertz, M. Suriyah, T. Leibfried
{"title":"Passivity-Based Sensitivity Analysis regarding Control Structures in Grid-Following MMC-HVdc Applications","authors":"C. Hirsching, A. Bisseling, S. Wenig, M. Goertz, M. Suriyah, T. Leibfried","doi":"10.1049/icp.2021.2441","DOIUrl":"https://doi.org/10.1049/icp.2021.2441","url":null,"abstract":"This contribution focuses on high voltage dc current transmission systems comprising modular multilevel converters and conducts a passivity-based stability assessment with respect to the overall impact of inner control structures. The investigation is motivated by previous research, where it was found that the implementation of inner control structures plays an important role in terms of damping and passivity properties over a broad frequency range.Within this contribution, the inner control's impact is investigated under consideration of outer loop dynamics. Here, a thorough analysis of the converter input-admittance is carried out in order to determine challenges related to control design. The analysis especially focuses on operation point sensitivity as well as on the impact of inner control design and structure at low harmonic orders.","PeriodicalId":347664,"journal":{"name":"The 17th International Conference on AC and DC Power Transmission (ACDC 2021)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114961175","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}
引用次数: 1
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