Specification for test of microgrid connected to distribution network
1 Scope
This standard specifies the test conditions, test items and test methods for grid-connection test of microgrids.
This standard is applicable to the grid-connection test of newly built, expanded and reconstructed grid-connected microgrids connected to distribution networks through voltage classes of 35 kV and below.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated reference, 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/ T 14549 Quality of electric energy supply - Harmonics in public supply network
GB/T 15153.1-1998 Telecontrol equipment and systems - Part 2: Operating conditions - Section 1: Power supply and electromagnetic compatibility
GB/T 15543 Power quality - Three-phase voltage unbalance
GB/T 15945 Power quality - Frequency deviation for power system
GB/T 17626.30 Electromagnetic compatibility - Testing and measurement techniques - Power quality measurement methods
GB/T 33589 Technical requirements for connecting microgrid to power system
GB 50150 Standard for hand-over test of electric equipment electric equipment installation engineering
DL/T 634.56 Telecontrol equipment and system - Part 5-6: Guidelines for conformance testing for the IEC 60870-5 companion standards
DL/T 860.10 Communication networks and systems in substations - Part 10 Conformance testing
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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
point of microgrid interconnection
electrical-connected point between microgrid and distribution network
3.2
interchange power between microgrid and distribution network
power exchange between microgrid and distribution network, which includes active interchange power and reactive interchange power.
3.3
anti-islanding protection of microgrid
protection that acts on the grid connected switch of the microgrid to trip when a power outage occurs due to faults, maintenance, or other reasons in the public grid connected to the microgrid
4 Basic provisions
4.1 General requirements
4.1.1 Newly built, expanded and reconstructed microgrids connected to distribution networks with voltage classes of 35kV and below shall be tested for grid connection in accordance with the requirements of this standard.
4.1.2 After the microgrid is installed and debugged, the grid-connection test shall be carried out in accordance with the requirements of this standard.
4.1.3 The grid-connection test shall be undertaken by testing organizations with corresponding qualifications or approved by China National Accreditation Service for Conformity Assessment (CNAS).
4.1.4 The grid-connection test shall be carried out in accordance with relevant safety regulations and test procedures, and corresponding safety precautions shall be taken.
4.1.5 Instruments and equipment for grid-connection test should not be connected with test power supply from the tested object.
4.1.6 During the grid-connection test, operations unrelated to the test should not be carried out on the line where the point of microgrid interconnection is located or the substation it is connected to.
4.1.7 During the grid-connection test, the test shall be stopped in case of weather deterioration (such as wind above force 5, rainstorm, lightning, etc.).
4.1.8 During the grid-connection test, the test shall be stopped in case of any abnormal situation in the distribution network or an emergency that directly endangers the safety of people, equipment and power grid.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Basic provisions
4.1 General requirements
4.2 Basis for preparation of grid-connection test scheme
4.3 Contents of grid-connection test scheme
4.4 Grid-connection test items
5 Grid-connection test conditions
5.1 Environmental conditions
5.2 Technical requirements of instruments and meters for grid-connection test
5.3 Necessary conditions of tested microgrid
5.4 Preparation before grid-connection test
6 Test of grid connected equipment
6.1 Appearance inspection
6.2 Operating mechanism test of grid-connected interrupting equipment
6.3 Grid-related protection verification
6.4 Local function test of monitoring and communication system
7 Function test of grid connection
7.1 Function test of off-gird to on-grid
7.2 Function test of on-grid to off-grid
7.3 Function test of interchange power control
7.4 Abnormal response test of grid
7.5 Low voltage ride through test
7.6 Anti-islanding protection function test
7.7 Power quality test
7.8 Telecontrol function test of monitoring and communication system
8 Test report
9 Requirements for periodic test
Annex A (Normative) Test method for measuring accuracy of local functions in monitoring and communication systems
A.1 Basic error test of current and voltage
A.2 Basic error test of active power and reactive power
A.3 Basic error test of frequency
A.4 Basic error test of power factor
A.5 Test indexes for AC sampling signal
Annex B (Normative) Test methods for the correctness and performance of remote-control function data in monitoring and communication systems
B.1 Telemetering function test
B.2 Remote signaling function test
Annex C (Normative) Test indexes for the correctness and performance of remote-control function data in monitoring and communication systems
Annex D (Normative) Test methods for the linkage of remote-control function in monitoring and communication systems
D.1 Remote-control function test
D.2 Remote regulating function test
Annex E (Informative) Original result record
E.1 Synchronous grid-connection test record
E.2 Test record of restoring grid connection after fault
E.3 On-grid to off-grid test record
E.4 Function test record of interchange power control
E.5 Voltage abnormal response test record
E.6 Low voltage ride through test record
E.7 Frequency abnormal response test record
E.8 Function test record of anti-islanding protection
