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GB/T 33589-2017 (GB/T33589-2017)

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GB/T 33589-2017: PDF in English (GBT 33589-2017)
GB/T 33589-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.020
F 12
Technical Requirements for
Connecting Microgrid to Power System
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3 
1 Application Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 5 
4 General Requirements ... 6 
5 Grid-connected Operation Mode ... 6 
6 Independent Operation Mode ... 11 
7 Switching of Operation Mode ... 12 
8 Grid-connected Testing... 12 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Attention is drawn to the possibility that some of the elements of this document may
be the subject of patent rights. The issuer of this document shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by and shall be under the jurisdiction of China Electricity
Council.
The drafting organization of this Standard. China Electric Power Research Institute.
The main drafters of this Standard. Liu Chun, He Guoqing, Li Guanghui, Chi Yongning,
Wang Weisheng, Feng Kaihui, Zhao Weiran, Hao Mukai, Wang Haijiao, Sun Yanxia,
Sun Wenwen.
Technical Requirements for
Connecting Microgrid to Power System
1 Application Scope
This Standard specifies the general principles and technical requirements for
connecting microgrid to power system.
This Standard applies to newly-built, rebuilt and extended grid-connected microgrid
which is connected to the grid through the voltage level of 35 kV and below.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
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/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
GB/T 15945, Power Quality – Frequency Deviation for Power System
GB/T 17215.322, Electricity Metering Equipment (A.C.) – Particular Requirements
– Part 22. Static Meters for Active Energy (Classes 0.2 S and 0.5 S)
GB/T 19862, General Requirements for Monitoring Equipment of Power Quality
GB/T 24337, Power Quality – Interharmonics in Public Supply Network
DL/T 448, Technical Administrative Code of Electric Energy Metering
DL/T 584, Code for Setting of 3 kV~110 kV Relaying Protection Equipment
DL/T 614, Multifunction Electricity Metering Equipment (A.C.)
DL/T 634.5101, Telecontrol Equipment and Systems – Part 5-101. Transmission
Protocols – Section 101. Companion Standard for Basic Telecontrol Tasks
DL/T 634.5104, Telecontrol Equipment and Systems – Part 5-104. Transmission
Protocols – Network Access for IEC 60870-5-101 Using Standard Transport Profiles
DL/T 645, Multi-function Watt-hour Meter Communication Protocol
NB/T 32015, Technical Specification for Distributed Resources Connected to
Distribution Network
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
distributed resources
A power supply which is connected through the voltage class of 35 kV and below,
located near users and mainly for local consumption, including distributed electricity
generation and energy storage.
3.2
microgrid
A small power supply and consumption system which consists of distributed electric
power generation, power consumption load, monitoring, protection and automation
equipment and others (including energy storage equipment if necessary) and is
capable of achieving internal balance of electric power and energy. Microgrids are
classified into grid-connected microgrids and independent microgrids.
3.3
grid-connected microgrid
The microgrid which is capable of operating in connection with external power grids or
operating independently and is mainly for grid-connected operation.
3.4
point of interconnection
For the microgrid having a booster station, it refers to bus bar or node on the high-
voltage side of the booster station. For the microgrid without a booster station, it refers
110%UN ≤ U < 135%UN Not exceeding 2.0 s
135%UN ≤ U Not exceeding 0.2 s
NOTE UN is the grid rated voltage of the point of common coupling of the microgrid.
5.6.4 The microgrid connected through the voltage class of 380 kV shall be capable
of switching to the independent mode within 0.2 s when the frequency of the point of
common coupling exceeds the operation range of 49.5 Hz ~ 50.2 Hz; for the microgrid
connected through the voltage class of 10(6) kV ~ 35 kV, the frequency protection shall
be as specified in 5.4.2 of this Standard.
5.6.5 For the microgrid connected through the voltage class of 10(6) kV ~ 35 kV, the
interconnection line may be provided with two-section current protection. When the
requirements for reliability, selectivity, sensitivity and quickness cannot be met, it is
preferably to use distance protection or optical fibre current differential protection.
5.6.6 The microgrid shall be capable of detecting islands rapidly and switching to the
independent operation mode immediately. The mode switching shall not malfunction
and lower the load power supply reliability.
5.7 Communication and information
5.7.1 The microgrid connected through the voltage class of 10(6) kV ~ 35 kV shall be
capable of data communication with the grid dispatcher, acquiring the electrical
operation conditions of the microgrid, uploading to the grid dispatcher and receiving
the control and adjustment instructions of the grid dispatcher. The microgrid connected
through the voltage class of 380 V shall be capable of monitoring and recording the
operation conditions.
5.7.2 The communication mode and information between the microgrid connected
through the voltage class of 10(6) kV ~ 35 kV and the grid dispatcher shall be as
specified in relevant standards, including remote measurement, remote signaling,
remote control and remote adjustment signals and the method for providing signals
and real-time requirements; the communication protocols based on DL/T 634.5101 and
DL/T 634.5104. For the microgrid connected through the voltage class of 380 V, the
wireless or optical fibre public network communication method may be used, but the
information security protection measures shall be taken.
5.7.3 The microgrid connected through the voltage class of 380 V shall be capable
of uploading energy.
5.7.4 For the microgrid connected through the voltage class of 10(6) kV ~ 35 kV,
under normal operation circumstances, the signals provided by the microgrid to the
grid dispatcher shall at least include.
a) the voltage and current of the point of common coupling of the microgrid;
b) the active power, reactive power, energy and others exchanged between the
7 Switching of Operation Mode
7.1 Switching of independent to grid-connected operation mode
7.1.1 When the frequency and voltage on the grid side at the point of common
coupling are as specified in GB/T 15945 and GB/T 12325, then the microgrid may start
the switching to grid-connected mode.
7.1.2 Before the microgrid is switched from the independent to the grid-connected
mode, synchronization control shall be carried out; when the voltage, frequency and
phase angle of the microgrid and point of interconnection meet the synchronization
conditions, then the switching to the grid-connected mode may be carried out.
7.1.3 For the microgrid connected through the voltage class of 10(6) kV ~ 35 Kv, the
switching to the grid-connected mode shall be carried out in accordance with the
instructions from the grid dispatcher during the interconnection.
7.1.4 When the microgrid is switched from the independent operation to the grid-
connected operation, it shall not cause that the power quality at the point of common
coupling exceeds the range specified.
7.1.5 When the microgrid is switched from the independent to the grid-connected
mode, it is preferably to use the switching method without power outage and the
switching transient process time is preferably not greater than 20 ms.
7.2 Switching of grid-connected to independent operation mode
7.2.1 The switching of the grid-connected operation to the independent operation of
the microgrid includes planned switching and unplanned switching caused by external
disturbances...
......
 
(Above excerpt was released on 2017-09-15, modified on 2022-02-20, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT33589-2017