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Hohn, Fabian
Publications (8 of 8) Show all publications
Jahn, I., Bessegato, L., Björk, J., Hohn, F., Norrga, S., Svensson, N., . . . Despouys, O. (2019). A Proposal for Open-Source HVDC Control. In: : . Paper presented at 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe).
Open this publication in new window or tab >>A Proposal for Open-Source HVDC Control
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2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Future multiterminal high-voltage direct-current (HVDC) grids are considered an enabling technology to efficiently integrate large amounts of renewable energy into the existing grid. However, already in today’s existing point-to-point HVDC links, harmonic interaction issues and instabilities related to the controland protection system of the converters have been reported. The converter control software is usually black-boxed and problems are therefore solved in close cooperation with the HVDC vendor. This paper aims to provide a starting point for a discussion onan open-source HVDC control system. In particular, it covers the control design including technical and non-technical aspects. The open-source approach can be useful to solve current as wellas future control-related problems, both in point-to-point links as well as in multiterminal and multivendor HVDC grids.

Keywords
HVDC transmission, Open source software
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-257736 (URN)
Conference
2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe)
Note

QC 20190917

Available from: 2019-09-03 Created: 2019-09-03 Last updated: 2019-10-14Bibliographically approved
Yiming, W., Xiao, Y., Hohn, F., Nordström, L., Wang, J. & Zhao, W. (2018). Bad Data Detection Using Linear WLS and Sampled Values in Digital Substations. IEEE Transactions on Power Delivery, 33(1), 150-157, Article ID 7867789.
Open this publication in new window or tab >>Bad Data Detection Using Linear WLS and Sampled Values in Digital Substations
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2018 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 1937-4208, Vol. 33, no 1, p. 150-157, article id 7867789Article in journal (Refereed) Published
Abstract [en]

Smart Grids employ intelligent control applications that require high quality data: fast, secure, and error free. Several researchers have focused on providing techniques for low latency and secured data links for these applications. Bad data detection is however generally provided only at the central level due to limitations in legacy technologies employed in many substations. With the introduction of IEC61850 data sharing within the substation becomes more flexible and transparent allowing more sophisticated management of data quality. Hence, this paper proposes a substation level bad data detection algorithm to facilitate also these types of requirements from applications. The algorithm is based on automatically detecting the substation topology by parsing standard substation description files and online state of circuit breakers and disconnectors. By applying linear weighted least square based state estimation algorithm, bad data from failing current transformers (CT) can be detected. By conducting the verification of different types of bad data, the results show the output of bad data detection algorithm provides higher accuracy than output from both measurement and protective CT in both static and faulty situations.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
bad data detection, digital substation, Linear WLS, process bus, sampled values
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-222247 (URN)10.1109/TPWRD.2017.2669110 (DOI)000423091100016 ()2-s2.0-85041035552 (Scopus ID)
Note

QC 20180205

Available from: 2018-02-05 Created: 2018-02-05 Last updated: 2019-09-18Bibliographically approved
Hohn, F. & Nordström, L. (2018). Data Models and Protocol Mapping for Reduced Communication Load in Substation Automation with High Sampling Rate Protection Applications. In: 2018 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm): . Paper presented at IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, Aalborg, October 29-31, 2018. Institute of Electrical and Electronics Engineers (IEEE), Article ID 8587426.
Open this publication in new window or tab >>Data Models and Protocol Mapping for Reduced Communication Load in Substation Automation with High Sampling Rate Protection Applications
2018 (English)In: 2018 IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids (SmartGridComm), Institute of Electrical and Electronics Engineers (IEEE), 2018, article id 8587426Conference paper, Published paper (Refereed)
Abstract [en]

In digital substations measurements between instrument transformers and protection systems are exchanged via an Ethernet-based process-level network using the Sampled Value (SV) protocol. At the same time, new protection applications, based on time-domain or travelling-wave signal information, require very high sampling rates, which increases the communication load on the network significantly. The increase of the communication load can be reduced through the concept of Distributed Signal Processing Units (DSPU). This paper proposes data models and suitable protocol mappings for such DSPUs and analyses their impact on the process-level network. The results are compared with the SV approach specified in IEC 61869–9 for digital interfaces of instrument transformers. It is shown that the DSPU concept can reduce the required network bandwidth in the case of high sampling rate protection applications.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
Data models, IEC Standards, Power system protection, Protocols, Substations, Transmission line measurements
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-240852 (URN)10.1109/SmartGridComm.2018.8587426 (DOI)000458801500008 ()2-s2.0-85061057774 (Scopus ID)978-1-5386-7954-8 (ISBN)
Conference
IEEE International Conference on Communications, Control, and Computing Technologies for Smart Grids, Aalborg, October 29-31, 2018
Note

QC 20190107

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-03-13Bibliographically approved
Hohn, F., Wang, J. & Nordström, L. (2018). Design of a Distributed Signal Processing Unit for Transmission Line Protection in a Centralized Substation Protection Architecture. In: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society: . Paper presented at IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, Washington, 21-23 October, 2018 (pp. 138-144). Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Design of a Distributed Signal Processing Unit for Transmission Line Protection in a Centralized Substation Protection Architecture
2018 (English)In: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 138-144Conference paper, Published paper (Refereed)
Abstract [en]

Travelling-wave and time-domain-based protection functions provide significant response time improvements over conventional phasor-based protection functions in power systems. These types of protection functions require very high sampling rates in the order of several hundreds of kHz. This paper proposes a novel centralized substation protection architecture (CPC) based on distributed signal processing units (DSPU) that enables the deployment of these high sampling rate applications in digital substations utilizing an Ethernet-based process-level network. The design of the DSPU is elaborated, and its signal processing algorithms are discussed. Moreover, the performance of the DSPU is analysed through dynamic tests and verified through a numerical electromaanetic transient simulation.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
Keywords
Finite impulse response filters, Substations, Signal processing algorithms, Harmonic analysis, Power system protection
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-240842 (URN)10.1109/IECON.2018.8591767 (DOI)2-s2.0-85061523664 (Scopus ID)978-1-5090-6684-1 (ISBN)
Conference
IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society, Washington, 21-23 October, 2018
Note

QC 20190107

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-03-18Bibliographically approved
Hohn, F., Rabuzin, T., Wang, J. & Nordström, L. (2018). Distributed signal processing units for centralised substation protection and control. The Journal of Engineering, 2018(15), 1223-1228
Open this publication in new window or tab >>Distributed signal processing units for centralised substation protection and control
2018 (English)In: The Journal of Engineering, ISSN 1872-3284, E-ISSN 2051-3305, Vol. 2018, no 15, p. 1223-1228Article in journal (Refereed) Published
Abstract [en]

Substation automation systems are characterised by a high degree of functional integration, which can lead to a centralised substation protection and control (CPC) architecture. Most CPC architectures utilise merging units to interface with current and voltage transformers, which causes a high-communication load on the process bus in case of large substations. This study proposes a CPC architecture based on distributed signal processing units (DSPUs) to overcome those drawbacks by publishing the results of the signal processing algorithms directly. The reduction of the communication load through the usage of DSPUs has been shown in a case study, which uses a 16-bay transmission substation topology as a reference.

Keywords
Data models, IEC standards, Signal processing, Substation protection, Substation automation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-241116 (URN)10.1049/joe.2018.0206 (DOI)
Note

QC 20190118

Available from: 2019-01-11 Created: 2019-01-11 Last updated: 2019-05-10Bibliographically approved
Jahn, I., Hohn, F. & Norrga, S. (2018). Impact of measurement and communication aspects on protection of multi-terminal DC grids. Paper presented at The 14th International Conference on Developments in Power System Protection (DPSP 2018). IET - The Journal of Engineering
Open this publication in new window or tab >>Impact of measurement and communication aspects on protection of multi-terminal DC grids
2018 (English)In: IET - The Journal of Engineering, E-ISSN 2051-3305Article in journal (Refereed) Published
Abstract [en]

The increased demand for renewable energy generation requires the higher flexibility of transmission systems. This requirement together with technical progress in high-voltage DC technology has resulted in the ambition to build large-scale multi-terminal DC grids. To achieve this goal, vendor interoperability is considered a key element. Standards exist for AC systems, but not for DC systems. This work discusses and evaluates the suitability of AC standards for DC systems. As a result, a different view on substation architecture is developed and two communication protocols are suggested for further investigation in this context.

Place, publisher, year, edition, pages
Institution of Engineering and Technology, 2018
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-239179 (URN)10.1049/joe.2018.0166 (DOI)000447973200071 ()
Conference
The 14th International Conference on Developments in Power System Protection (DPSP 2018)
Projects
PROMOTioN
Note

This paper is the journal version of the corresponding conference paper (DPSP 2018). QC 20181130

Available from: 2018-11-19 Created: 2018-11-19 Last updated: 2019-05-10Bibliographically approved
Jahn, I., Hohn, F. & Norrga, S. (2018). Impact of Measurement and Communication on Protection of MTDC Grids. In: : . Paper presented at 14th IET International Conference on Developments in Power System Protection (DPSP) 2018.
Open this publication in new window or tab >>Impact of Measurement and Communication on Protection of MTDC Grids
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The increased demand for renewable energy generation requires higher flexibility of transmission systems. This requirement together with technical progress in high-voltage direct-current (HVDC) technology have resulted in the ambition to build large-scale multi-terminal DC (MTDC) grids. To achieve this goal, vendor interoperability is considered a key element. Standards exist for AC systems,but not for DC systems. This work discusses and evaluates the suitability of AC standards for DC systems. As a result, a different view on substation architecture is developed and two communication protocols are suggested for further investigation in this context.

Keywords
HVDC, protection, communication, delays
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-224212 (URN)
Conference
14th IET International Conference on Developments in Power System Protection (DPSP) 2018
Note

QCR 20180314

Available from: 2018-03-13 Created: 2018-03-13 Last updated: 2019-10-18Bibliographically approved
Babazadeh, D., Hohn, F., Wu, Y. & Nordström, L. (2017). Distributed Two-stage Network Topology Processor for HVDC Grid Operation. In: 2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING: . Paper presented at 2017 IEEE Power & Energy Society General Meeting, JUL 16-20, 2017, Chicago, IL. IEEE
Open this publication in new window or tab >>Distributed Two-stage Network Topology Processor for HVDC Grid Operation
2017 (English)In: 2017 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents the results of an analysis of distributed two-stage coordination of network topology processor for HVDC grids. In the first stage of the two-stage processor, the substation topology is analyzed locally using an automated graph based algorithm. Thereafter, a distributed algorithm is proposed to used the neighboring information to realize the grid connectivity. For distributed islanding detection, the connectivity problem is formulated as a set of linear equations and solved iteratively using successive-over-relaxation method. The performance of the proposed methods versus conventional one-stage method has been tested in an islandinv, scenario for a 5-terminal HVDC grid.

Place, publisher, year, edition, pages
IEEE, 2017
Series
IEEE Power and Energy Society General Meeting PESGM, ISSN 1944-9925
Keywords
distributed coordination, HVDC grid, topology processor
National Category
Computational Mathematics
Identifiers
urn:nbn:se:kth:diva-228181 (URN)10.1109/PESGM.2017.8274088 (DOI)000426921801072 ()2-s2.0-85046345247 (Scopus ID)978-1-5386-2212-4 (ISBN)
Conference
2017 IEEE Power & Energy Society General Meeting, JUL 16-20, 2017, Chicago, IL
Note

QC 20180521

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-11-19Bibliographically approved
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