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WG C6.30 Battery electric storage systems

Complementing and updating earlier work carried out by the WG C6.15 (Electric Energy Storage Systems), the specific objectives of this WG will be:

 1. Review international practices and classify BESS technologies, structures (layouts) and applications for the grid and for the market with emphasis on the distribution networks (peak shaving, frequency regulation, voltage support, capacity firming, ramping support, power quality, demand response, etc.)

2. Provide insight on experiences in pilot installations at the distribution level.

3. Elaborate guidelines on the integration of BESSs into distribution networks of up to 132 kV.

4. Use cases

5. Relate and coordinate the report with existing (and under development by IEC/CIGRE/IEEE) guidelines and standards for BESSs.

Scope

Complementing and updating earlier work carried out by the WG C6.15 (Electric Energy Storage Systems), the specific objectives of this WG will be:

 1. Review international practices and classify BESS technologies, structures (layouts) and applications for the grid and for the market with emphasis on the distribution networks (peak shaving, frequency regulation, voltage support, capacity firming, ramping support, power quality, demand response, etc.)

2. Provide insight on experiences in pilot installations at the distribution level. The idea is to understand the impact of BESSs on the distribution network operation as regards:

  • Power quality
  • Safety
  • Simultaneous use of different BESS technologies in the same network
  • Renewable energy interactions with BESSs
  • Expected impact (e.g. in terms of power quality and safety) of a large number of BESSs (mostly together with renewable energies) in a distribution network
  • Operation of aggregated distributed BESSs
  • Varying control system strategies, for instance time or voltage dependent
  • Fault ride through capability of existing BESS inverters & control systems

3. Elaborate guidelines on the integration of BESSs into distribution networks of up to 132 kV. In principle the topics to include are battery services for grid operation and service to the energy market as follows:

  • Planning and design:
    • Energy system planning (location/placement of BESSs, e.g. distributed at household levels, feeder levels, and/or transformer/substation levels)
    • BESS models and equivalents for power network applications
    • BESS design and optimal sizing including  power conversion equipment for delivery of both active and reactive power  
    • BESS life-cycle assessment for power network applications
  • Distribution system operation:
    • Integrating energy storage control in network management systems
    • Operating modes (microgrids, island mode, backup, frequency fluctuation smoothing, PV energy storage, etc.)
    • BESS operation in faulted networks: Technical characteristics and operation modes for BESS/Inverter combinations to contribute to network fault current for fault clearing purposes
  • Optimum technical characteristics and control settings for enhanced fault ride-through, possibly by opening up frequency & voltage windows on inverters, or other
  • Environmental aspects (of the batteries over the environment and vice versa)
  • Services to the market:
    • Aggregation and coordinated control of BESS units for services to the energy market
    • Other ancillary and back-up services around energy storage
  • Standardization aspects:
    • Interoperability and communication (with focus on the way the expected interfaces should look like)
    • BESS testing and performance measurement (for most common applications, e.g. peak shaving and voltage support, or others)
    • BESS safety

 4. Use cases

  • Technical and electricity market models in selected countries
  • International examples for use cases including new business models
  • International experiences on cost effectiveness according to BESS delivered services

 5. Relate and coordinate the report with existing (and under development by IEC/CIGRE/IEEE) guidelines and standards for BESSs.

Convenor: Nikos Hatziargyriou (Greece)