Case study 5

Demonstration of medium scale battery
Suha, Slovenia
Kranj, Slovenia
Start: 2018

We build a medium scale storage unit (170kW, 330 kWh) for the demonstration of its flexible and robust use in diverse applications. This battery energy storage system BESS will first operate connected to 1x 400 kVA OLTC MV/LV transformer station of Elektro Gorenjska supplying Suha village residential grid. In the second demo case, storage unit will be connected to LV industrial grid in Elektro Gorenjska headquarters in Kranj.

Demonstration medium scale battery

The Battery Energy Storage System BESS consists of 1 metal enclosure containers that embodies the Power Conversion Unit PCU and the Battery Bank Unit BBU. The system operates for functional validation and for peak shaving in the factory electrical grid in the ABB factory (Belgium). It will then move to Slovenia for two demonstrations in the power grid of Elektro Gorenjska (DSO, Slovenia).

First demonstration will take place in rural residential area of Suha village, where we are recently completing the erection of the transformer station.

Second demonstration will take place in Elektro Gorenjska headquarters, where no special construction activities are foreseen.

The only construction activities at both demo sites will be the simple placement of the container near existent transformer stations and the connection to network grid.

Medium scale unit connected to low voltage substation in residential grid 

Demonstration of flexible and robust use of medium scale storage unit connected to low voltage substation in TS Suha residential grid and EG headquarter industrial grid is the main purpose of this EG demo cases. TS Suha LVN with 7 PV power plants and energy flow in both directions (LVN acting as a regular consumer and as energy source for MV network due to PV production) and as well as industrial demonstration case offers demonstration of variety of project goals as follows:

  • Ease of integration in existing infrastructure (including interoperability)
  • Control and battery management system and its cooperation with the devices in the system (in this case the transformer station and PV units)
  • A high degree of transformer station self sufficiency
  • Ensuring maximum efficiency in decentralised energy production
  • Potential in supporting the regime of the PV production
  • Impact on efficiency (and thus return of investment) of complete system
  • High degree of self-sufficiency of battery combination and PV production could deliver
  • Reliability in the event of blackouts
  • Peak demand control within the daily load diagram
  • Reduction of line congestion
  • Voltage control

Medium scale storage unit connected to low voltage substation in industrial grid. 

In residential demonstration case, battery storage with power conversion unit will be situated near the transformer station. It will have two major connections with the adjacent transformer station:

  •  0.4 kV power connection will connect the battery (0.4 kV output power) to the transformer low voltage busbars, providing battery charge and discharge based on appropriate control algorithm
  •  UTP network cable connection will connect Battery Power Conversion PLC Unit to transformer station communication switch, which will be connected to the Sipronika network control server in EG headquarters via Wimax broad band radio.
  • EG power network analysers will collect and provide all network parameters (measurements) for the following LVN points:
  • All 7 PV power plants
  • Two residential load only locations (Suha 56 and Suha 21)
  • Transformer station

All measurements will be collected on 1 minute period at EG Power Quality server and for the purpose of the Story project accessible on Sipronika network control server (SNCS).

RTU controller will acquire all network measurements either via on line communication with Sipronika network control server or directly measure through the battery management system or the energy management system. Based on online real time measurements (1 minute time slot), the appropriate control algorithm integrated within RTU will enable the provision of aforementioned goals. Access to SNCS will also be available for BASN data collection purposes.

Responsible partners: Elektro Gorenjska  and  ABB 

"Storage as an important near future smart grid device needs to be thoroughly tested to prove technical acceptance and as well as for exploring the acceptable business model."
Marjan Jerele, Elektro Gorenjska

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December 14, 2016
Container BBU is ready for the transport.

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November 15, 2016
Installation of the MV transformer and switching cabinet next to the BHKW in the factory Hagen.

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November 3, 2016
Visit at the manufactorer of the Power Converter Unit PCU: Assembly of the power stacks AC/DC and DC/DC.

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September 9, 2016
Installation of the 6 Battery Strings into the Container of the Battery Bank Unit BBU.

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August 8, 2016
The supplier of the Power Converting Unit PCU faces a delivery delay for the heat sinks. This important items blocks the timely manufacturing of the BESS.

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July 22, 2016
Manufacturing and despatch of 12V Monoblocs for STORY Battery Bank Unit BBU.

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LV network SUHA single line diagram.

A number of power network analysers are already installed within the network for the on line monitoring and control purposes ( data is registered per one minute time period ). LVN single line diagram also shows the installed network power analyser locations. Recently there are 8 fully monitored and data registered locations:

  • Transformer station
  •  5 PV locations
  •  2 households

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EG headquarters demonstration site topology

EG headquarters with the variety of installed electrical devices will serve as a test bed for connection of medium scale storage unit in the industrial grid. The following apparatus are comprised within the EG premises:

  • Photovoltaic power plant
  • Cold storage (Ice bank) within the heating / cooling facility
  • 27 kW combined heat and power unit
  • 2x 630 kVA transformer station
  • 80 kW diesel generator

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EG headquarters demo block diagram

The following technologies are installed:

  • 2 x 630 kVA transformer station
  • 35 kW photovoltaic power plant
  • 27 kW combined heat and power unit
  • 80 kW diesel generator with network synchronization capabilities and the possibility of adjusting the amount of emitted power
  • Ice bank within the heating / cooling facility

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TS Suha LVN with 7 PV power plants

Demonstration of flexible and robust use of medium scale storage unit connected to low voltage substation in TS Suha residential grid and EG headquarter industrial grid is the main purpose of this EG demonstration cases. TS Suha LVN with 7 PV power plants and energy flow in both directions ( LVN acting as a regular consumer and as energy source for MV network due to PV production ) and as well as industrial demo case offers demonstration of variety of project goals as follows:

  • Ease of integration in existing infrastructure (including interoperability)
  • Control and battery management system and its cooperation with the devices in the system (in this case the transformer station and PV units)
  • A high degree of transformer station self sufficiency
  • Ensuring maximum efficiency in decentralised energy production
  • Potential in supporting the regime of the PV production
  • Impact on efficiency (and thus return of investment) of complete system
  • High degree of self-sufficiency of battery combination and PV production could deliver
  • Reliability in the event of blackouts
  • Peak demand control within the daily load diagram
  • Reduction of line congestion
  • Voltage control

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LVN SUHA topology, PV and transformer locations

For second demonstration case, storage unit will be connected into EG headquarters industrial LV network. Suha village LVN is an example of a 0,4 kV rural cable network ( no overhead lines ) with high penetration of PV generation. The cable network topology and positions of PV and 20/0,4 kV MV/LV transformer station.

 

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