Development of the electricity network

With the constantly increasing density of the urban structure in Helsinki, the electricity system also needs compact network and technology solutions. A high-voltage distribution network is built as a cable network. We are clarifying system-technical issues as a basis for implementation planning. The level of our excellent security of supply must be retained in the development.

Security of supply

The key figures of the security of supply in Helsinki are outstanding in a global context. The average duration of interruptions in electricity distribution (SAIDI) per year in Helsinki has settled at a few minutes. On average, a customer has a power cut lasting 30 minutes every ten years.  

Achieving this kind of a security of supply is a result of decades of research and development work and systematic investment and development solutions built on that work.  

Studies related to the security of electricity supply

2019: Helen Electricity Network takes action to improve the Reliability of the Medium Voltage Distribution Network
Siirto, Vepsäläinen, Hämäläinen, Loukkalahti. Transmission and Distribution World Magazine, March 2019.

2018: Cired working group: Resilience of distribution grids.
Final Report 31.5.2018
http://www.cired.net/files/download/204

2017:
Helen Electricity Network Ltd’s Process Towards High Level of Supply Reliability
Loukkalahti, Heine, Hyvärinen, Siirto. CIRED 2017 / IET Journals. 
http://digital-library.theiet.org/content/journals/10.1049/oap-cired.2017.1037

Improving reliability by focusing on the quality and condition of medium-voltage cables and cable accessories
Siirto, Vepsäläinen, Hämäläinen, Loukkalahti. CIRED 2017 / IET Journals. 
http://digital-library.theiet.org/content/journals/10.1049/oap-cired.2017.1104

2016:
Distribution Automation and Self-Healing Urban Medium Voltage Networks. Doctoral dissertation
Siirto, Osmo. Aalto University. 
https://aaltodoc.aalto.fi/handle/123456789/23027

Improving reliability in an urban network
Siirto, Hyvärinen, Loukkalahti, Hämäläinen, Lehtonen. Electric Power Systems Research, vol. 120.

Optimal Distribution Network Automation Considering Earth Fault Events
Siirto, Safdarian, Lehtonen, Fotuhi-Firuzabad. IEEE Transactions on Smart Grid, vol. 6, no. 2.

Simple fault path indication techniques for earth faults
Lehtonen, Siirto, Abdel-Fattah. IEEE Proc. of 9th International Conference on Electric Power Quality and Supply Reliability. Estonia.

Fault location, isolation and restoration in a city distribution network
Siirto, Kuru, Lehtonen. IEEE Proc. of 9th International Conference on Electric Power Quality and Supply Reliability. Estonia.

2013:
Optimization of distribution automation in urban networks
Siirto, Hakala, Hyvärinen, Heine, Lehtonen. International Review of Electrical Engineering, vol. 8, no. 4.

2012:
Neutral current compensation and earth fault suppression
Siirto, Loukkalahti, Hyvärinen, Heine, Lehtonen. IEEE Proc. of 8th International Conference on Electric Power Quality and Supply Reliability. Estonia.

2011:
Customer damage evaluation and network automation strategies for different urban zones
Siirto, Hyvärinen, Hakala, Jääskeläinen, Lehtonen. CIRED 2011. Germany.

Planning of system engineering

The high-voltage distribution network in Helsinki is subject to a significant need for change. This is partly due to the closer urban structure, the significant changes taking place in the heat and electricity production in the area and a change in the way customers are using electricity.  

This trend requires system-level planning of the electricity network concerning the techno-economic management of both active and reactive power.  

Studies related to planning of system engineering

Analysis of Changing Consumer Reactive Power Patterns in Distribution Grids
Pihkala, Takala, Heine. The 11th International Conference on Power Quality and System Reliability 2019.  

Control of Reactive Power in Electricity Distribution Companies
Takala, Pihkala, Heine. CIRED 2019. Paper 1448.

Loistehon kaupallinen hallinta jakeluverkkoyhtiössä
Takala, Suvi. Diplomityö. Aalto - yliopisto.
http://urn.fi/URN:NBN:fi:aalto-201812146473

The Importance of Realistic Load Modeling in Power System Harmonic Resonance Analysis
Pihkala, Heine (Helen Electricity Network Ltd.); Sousa, (ABB Finland). PSCC 2018.

Jännitteensäädön ja loistehon hallinnan kokonaiskuva
Hautere, Tuominen, Repo (Tampereen teknillinen yliopisto).
https://energia.fi/files/2373/Jannitteensaadon_ja_loistehon_hallinnan_kokonaiskuva_-raportti_2018.pdf

Block-Layer Reliability Method for Distribution Systems under Various Operating Scenarios
Sousa, Humayun, Pihkala, Millar, Lehtonen. IEEE Transactions on Power Systems, vol. 32, no. 2.

Reliability aspects of network planning for meshed subtransmission networks
Sousa, Bruno. Doctoral thesis. Aalto University. 
https://aaltodoc.aalto.fi/handle/123456789/18504

Impact of primary substation and HV faults on suburban MV network topology and total costs
Millar, Sousa, Pihkala, Lehtonen, Saarijärvi. POWERENG 2015. Latvia.

Sensitivity and viability analyses of overhead and underground meshed subtransmission networks
Sousa, Pihkala, Lehtonen. International Review of Electrical Engineering, volume 10, issue 2.

Layered reliability assessment of a typical Finnish medium voltage network under multiple weather and load scenarios
Sousa, Millar, Pihkala, Lehtonen. CIRED 2015. France.

2014:
Comparison of voltage sag and outage costs in urban meshed 110-kV subtransmission network planning
Sousa, Pihkala, Lehtonen. ISGT 2014. Turkey.

Three-layer seasonal reliability analysis in meshed overhead and underground subtransmission networks in the presence of co-generation
Sousa, Humayun, Pihkala, Lehtonen. International Journal of Electrical Power and Energy Systems, volume 63.

Optimal allocation and assessment of superconducting fault current limiter in an urban meshed 110-kV subtransmission network
Sousa, Pihkala, Lehtonen. CIGRE Session 2014, Pariisi.

2013:
Evaluation of Fault Current Limitation Techniques in Urban Meshed 110-kV Subtransmission Networks
Sousa, Pihkala, Lehtonen. ISGT Europe. Denmark.

Development of the planning and use of the distribution network

Studies related to the development of the planning and use of the distribution network

Regularly optimized medium voltage network as a target for planners: A case of Helsinki city.
Lepistö. CIRED 2019. Paper 1010.  

Varayhteyksien ylläpitomaksujen hinnoittelu.
Tauriainen, Jukka: Metropolia Ammattikorkeakoulu. Sähkötekniikka.
http://urn.fi/URN:NBN:fi:amk-2019053013407  

Keski- ja pienjänniteverkon suunnitteluohjeen laatiminen.
Hyvönen, Eemeli: Metropolia Ammattikorkeakoulu. Sähkötekniikka.
http://urn.fi/URN:NBN:fi:amk-2019052511895  

Sähköasemien ja suurjännitteisen jakeluverkon vikojen hallinta.
Hämäläinen, Niki: Kaakkois-Suomen ammattikorkeakoulu. Sähkö- ja automaatiotekniikka.

2018:
Työmaahallinnan kehittäminen mobiilisovelluksen avulla
Kivisoja, Tommi. YAMK. Metropolia
http://urn.fi/URN:NBN:fi:amk-201802092262

2017:
Kaupunkikeskijänniteverkon optimointi
Lepistö, Juhani. Diplomityö. Aalto - yliopisto.
https://aaltodoc.aalto.fi/handle/123456789/26150

Sähköliittymien hinnoittelu
Nätynki, Antti. Insinöörityö. Metropolia. 
http://urn.fi/URN:NBN:fi:amk-201602011803

Sähköverkkosuunnittelun teknis-taloudelliset vertailumahdollisuudet tietojärjestelmien avulla
Järvinen, Samuel. Insinöörityö. Metropolia. 
http://urn.fi/URN:NBN:fi:amk-201601111207

Kaupunkiverkon keskijännitekaapeleiden kuormitettavuus
Holopainen, Pekka. Insinöörityö. Metropolia. 
http://urn.fi/URN:NBN:fi:amk-201602041904

Smart grid technology

Development of new technologies for the management of fault situations in the electricity network and distributed production is important in a production environment change where distributed production and underground cabling are increasing.

Studies related to the smart grid technology

2017-2019:
VINPOWER – Vaasan innovaatioalusta sähköverkkojen tutkimukseen
http://www.hanketuloskortti.fi/hanketuloskortti/vinpower-vaasan-innovaatioalusta-sahkoverkkojen-tutkimukseen/

2018:
Digitalization in Power Distribution Systems; the Kalasatama Smart Grid Project.
Loukkalahti (Helen Electricity Network Ltd.), Sousa, (ABB, Finland), Celko, (ABB, Chech Republic), Majer, (ABB, Chech Republic). CIGRE 2018, B5-204.

2017:
Protect-DG Loppuraportti
Kauhaniemi, Kumpulainen, Farughian, Mekkanen, Memon, Palizban, Voima (Vaasan yliopisto), Pinomaa, Poluektov, Romanenko, Kosonen, Ahola (Lappeenrannan teknillinen yliopisto).
https://www.univaasa.fi/fi/research/groups/ses/projects/protectdg_loppuraportti/protect-dg_loppuraportti.pdf

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