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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
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This standard was proposed by the China Electricity Council (CEC).
This standard is under the jurisdiction of National Technical Committee 550 on Electric Energy Storage of Standardization Administration of China (SAC/TC 550).
Technical rule for electrochemical energy storage system connected to power grid
Technical rule for electrochemical energy storage system connected to power grid
1 Scope
This standard specifies the technical requirements of the electrochemical energy storage system for connecting to the power grid, such as power quality, power control, power grid adaptability, protection and automatic safety devices, communication and automation, power metering, grounding and safety signs, and connecting test to power grid.
This standard is applicable to electrochemical energy storage systems with rated power of 100 kW and above and energy storage time of not less than 15 min, and it may also apply to electrochemical energy storage systems with other power levels and energy storage time.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 2894 Safety signs and guideline for the use
GB/T 12325 Power quality - Deviation of supply voltage
GB/T 12326 Power quality - Voltage fluctuation and flicker
GB 14050 Types and safety technical requirements of system earthing
GB/T 14285 Technical code for relaying protection and security automatic equipment
GB/ T 14549 Quality of electric energy supply - Harmonics in public supply network
GB/T 15543 Power quality - Three-phase voltage unbalance
GB/T 19862 Power quality - General requirements for monitoring equipment of power quality
GB/T 24337 Power quality - Interharmonics in public supply network
GB/T 31464 The grid operation code
GB 50057 Design code for protection of structures against lightning
GB/T 50065 Code for design of AC electrical installations earthing
GB/T 36548 Test specification for electrochemical energy storage system connected to power grid
DL/T 448 Technical administrative code of electric energy metering
DL/T 584 Setting guide for 3 kV ~ 110 kV power system protection equipment
DL/T 645 Multi-function watt-hour meter communication protocol
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrochemical energy storage system
a system in which electrochemical cells are used as energy storage carriers and recyclable electric energy is stored and released through a power conversion system
Note: It generally includes battery system, power conversion system and related auxiliary facilities. For electrochemical energy storage systems connected to a voltage class of 10(6) kV and above, they usually include collecting lines, step-up transformers, etc.
3.2
power conversion system
a device that connects the battery system with the power grid (and/or load) to realize bidirectional conversion of power
3.3
point of interconnection
for an energy storage system with a step-up transformer, point of interconnection refers to the bus or node on the high voltage side of the step-up transformer. For an energy storage system without step-up transformer, point of interconnection refers to the output summary point of the energy storage system
Note: See Annex A for the illustration of point of common coupling.
3.4
point of common coupling
A point where energy storage system connects to the public power grid
Note: See Annex A for the illustration of point of common coupling.
3.5
hot standby state
a state when energy storage system is in condition to run, the equipment protection and automatic devices are in normal running state, and the energy exchange with the power grid can be realized by issuing control instructions to the energy storage system
3.6
response time for charging
the time for the energy storage system to change from the hot standby state to charging after it receives the control signal until the charging power reaches 90% of the rated power PN for the first time
See Figure 1.
Figure 1 Response time for charging
3.7
regulation time for charging
the time for the energy storage system to change from the hot standby state to charging after it receives the control signal until the charging power reaches the rated power PN and the power deviation starts to be controlled within ±2% of the rated power PN
See Figure 2.
Figure 2 Regulation time for charging
3.8
response time for discharging
the time for the energy storage system to change from the hot standby state to discharging after it receives the control signal until the discharging power reaches 90% of the rated power PN for the first time
See Figure 3.
Figure 3 Response time for discharging
3.9
regulation time for discharging
the time for the energy storage system to change from the hot standby state to discharging after it receives the control signal until the discharging power reaches the rated power PN and the power deviation starts to be controlled within ±2% of the rated power PN
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Basic requirements
5 Power quality
6 Power control
7 Power grid adaptability
8 Protection and automatic safety device
9 Communication and automation
10 Electric energy metering
11 Grounding and safety signs
12 The power grid connecting test
Annex A (Informative) Illustration of point of interconnection and point of common coupling
Annex B (Informative) Recommended class of voltage for electrochemical energy storage system connected to power grid
