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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



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