1 Scope
This standard specifies the operation and control specification for interconnecting the energy storage system, in which the electric energy is stored in electrochemical form, with the distribution network.
This standard is applicable to the electrochemical energy storage system interconnecting with the distribution network whose voltage class is 10(20)kV or below; as for other types of energy storage systems interconnecting with the distribution network as well as those in the microgrid, the provisions of this standard may also be referred to.
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 14050 Types and Safety Technical Requirements of System Earthing
GB 50057 Design Code for Protection of Structures Against Lightning
GB/T 50065 Code for Design of AC Electrical Installations Eathing
DL/T 448 Technical Administrative Code of Electric Energy Metering Unit
DL/T 584 Code for Setting of 3kV~110kV Relaying Protection Equipment
NB/T 32015 Technical Rule for Distributed Resources Connected to Distribution Network
NB/T 33015 Technical Guideline for Electrochemical Energy Storage System Interconnecting with Distribution Network
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1
point of interconnection
for energy storage systems equipped with booster station, the point of interconnection is the bus or node on the high-voltage side of the booster station; for energy storage systems without booster station, it is the aggregation point of electric energy output
(3.3, terms and definitions, NB/T 33015)
3.2
interconnection interface
an integration of individual equipment or several equipment, including the interconnected parts between converter and distribution network as well as system access and control, relay protection and automatic safety device, automated communication device, measuring device, etc. The schematic diagram for the interconnection interface of electrochemical energy storage system and distribution network is as shown in Figure 1
(3.4, terms and definitions, NB/T 33015)
3.3
emergency power support (EPS)
electrochemical energy storage system quickly providing active and reactive power support according to distribution network demands when distribution network is in fault so as to strengthen the stability of the local power grid
3.4
islanding
state of partial power grid including load and power supply continuing operating in an isolated way after disconnecting from main grid; islanding may be classified into unplanned islanding and planned islanding.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Basic Requirements
5 Power Control and Voltage Regulation
6 Switchover of Interconnection/ Disconnection and Charge/ Discharge
7 Automatic Protection and Safety Devices
8 Abnormal Response of Power Grid
9 Power Quality
10 Electric Energy Measurement
11 Communication and Automatization
