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Field Test Platform for LVDC DistributionField Test Platform for LVDC DistributionT2.4 LVDC Research Platforms and Field Tests
Pasi Nuutinen, Tero Kaipia, Pasi Peltoniemi,Pasi Salonen, Andrey Lana, Antti Pinomaa
T2.4 LVDC Research Platforms and Field TestsJuha Lohjala
Suur-Savon Sähkö Ltd.Pasi Salonen, Andrey Lana, Antti Pinomaaand Jarmo Partanen
Lappeenranta University of Technology
Suur-Savon Sähkö Ltd.
Lappeenranta University of Technology
IntroductionIntroductionLVDC distribution network field test setup is located inSuomenniemi, Finland. The setup consists of rectifier,Suomenniemi, Finland. The setup consists of rectifier,DC cable, and three individual three-phase Customer-End Inverters (CEI) which supply four customers.End Inverters (CEI) which supply four customers.Nominal power of the CEIs is 16 kVA and aremanufactured by LUT. The main objective is to providemanufactured by LUT. The main objective is to providefield test environment with real customers forverification of the LVDC technology and related smartverification of the LVDC technology and related smartgrid functionalities (e.g. microgrids).
CEI #3CEI #3Connected to +DC
CEI #2
±750 VDC
Fig. 5Connected to +DC
±750 VDC
200 m
CEI #1Connected to –DC
Fig. 1 The LVDC field test setup at Suomenniemi.
200 m
CEIs Filtering and isolation BackhaulNW
VPNBackhaulNW
VPNWeb-browser Web-browser
Two-tier transformer Rectifier
D YL1L2L3PEN
CEIs Filtering and isolation
ADSLmodem
NW
Ethernet switch
Fiber/EthernetFiber/Ethernet
Inverter 1
Server Client 1
Rectifier
access with 3Gmodem
Backup remote
Web-browsercontrollable
Web-browsercontrollable
Two-tier transformer Rectifier
DD
D YL1L2L3PEN
EmbeddedPC
Fiber/Ethernetconverter
Fiber/EthernetSwitch
VS 1 2 3
Server Client 1
Inverter 2
Single mode Fiber
Inverter 3
Controlboard
Embedded PC
Controlboard
DY
D YL1L2L3PEN
Client 2Client 3
Fiber/Ethernetconverter
Fiber/Ethernetconverter
EmbeddedPC
Controlboard
Embedded PC
Controlboard
Fig. 2 Basic structure and converter setupof the field test platform.
DC cable
Fig. 3 field test platform communicationssetup.
Fig. 4 Rectifier (left) and CEI (right) cabinets.
SGEM unconference 5.-6.9.2012, NORDAC 10.
Field Test Platform for LVDC DistributionField Test Platform for LVDC DistributionT2.4 LVDC Research Platforms and Field TestsT2.4 LVDC Research Platforms and Field Tests
Juha LohjalaSavon Sähkö Ltd.
Mika Matikainen, Arto Nieminenand Mika KarhinenSavon Sähkö Ltd. and Mika Karhinen
Järvi-Suomen Energia Ltd.
Fig. 5 Web portal for monitoring and control. Examples of measurements and fault codes(July thunderstorm).
Results(July thunderstorm).
Results– Verification and development of system design, control– Verification and development of system design, control
algorithms and management systems– Experiences from electricity end-users and from– Experiences from electricity end-users and from
installations and operations personnel– Durability and reliability of electronic components in– Durability and reliability of electronic components in
demanding distribution network environment– Practical experiences to support LVDC system
Experiences so far
– Practical experiences to support LVDC systemstandardisation
Experiences so far– Over 1500 hrs 24/7 operation, no customer complaints– Several HSARs exceeded without customer-end– Several HSARs exceeded without customer-end
interruption– Thunderstorm in July caused DC network overvoltages– Thunderstorm in July caused DC network overvoltages
but no other failures than commercial ADSL modem– Current sensor failures have caused three short-time
Next steps
– Current sensor failures have caused three short-timeinterruptions at one customer, problem solved
Next steps– Continuous collection of user experiences– Continuous collection of user experiences– Improvement of measurement data logging– Implementation of disturbance recording system– Implementation of disturbance recording system– Updates to converter hardware and system controls– Connection of energy storages and local generation– Connection of energy storages and local generation– Integration of microgrid controls
6.9.2012, NORDAC 10.-11.9.2012
