GB/T 33592-2017Specification of operation and controlling for distributed resources connected to power grid (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

1 Scope

This standard specifies the operation and controlling requirements for the distributed resources connected to power grid in such aspects as on-grid/off-grid control, active power control, reactive voltage regulation, power grid abnormal response, power quality monitoring, communication and automation, relay protection and safety automatic device, and lightning protection and grounding.

This standard is suitable for the operation and controlling of the newly built, reconstructed, and extended distributed resources which are connected to the 35 kV and below voltage level power grid.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this Standard.

GB/T 12325 Power quality - Deviation of supply voltage

GB/T 12326 Power quality - Power fluctuation and flicker

GB 14050 Types and safety technical requirements of system earthing

GB/T 14549 Quality of electric energy supply - Harmonics in public supply network

GB/T 15945 Power quality - Frequency deviation for power system

GB 26859 Safety code of electric power industry - Part of electric lines

GB 26860 Safety code of electric power industry - Electric part of power plants and transformers

GB 50057 Design code for protection of structures against lightning

GB/T 50064 Code for design of overvoltage protection and insulation coordination for AC electrical installations

GB 50065 Code for grounding design of AC electrical installations

GB/T 33593-2017 Technical requirements for grid connection of distributed resources

NB/T 33011 Technical specification for distributed resources connected to power grid

NB/T 33015 Technical guideline for electrochemical energy storage system interconnecting with distribution network

3 Terms and definitions

The following terms and definitions apply to this document.

4 Basic requirements

4.1 The distributed resources connected to the power grid shall have the testing report which is issued by the unit or department having corresponding qualifications, the testing items and testing methods shall comply with the provisions of NB/T 33011, AND the test results shall comply with the requirements of GB/T 33593-2017.

7 Reactive power regulation

7.6 As for the distributed resources connected to the 10 (6) kV ~ 35 kV user internal power grid AND transmitted electricity to the public power grid, it is preferable for it to have the reactive voltage control function. Under the conditions that the distributed resource satisfies the reactive output range and the public connection point power factor limits, the power factor and voltage at its power grid connection point are controlled; meanwhile, it is preferable to accept the reactive order from the power grid scheduling institute, AND its regulation method, reference voltage, voltage difference regulation rate, and power factor, etc., shall follow the requirements of the scheduling agreement.

7.7 As for the distributed resources connected to the 10 (6) kV ~ 35 kV public power grid, it shall participate in the power grid reactive voltage regulation within its reactive output range, AND it shall have the function of accepting the reactive voltage control order from the power grid scheduling institute. Under the conditions of satisfying with the distributed resource reactive output range AND that the voltage at the power grid connection point is qualified, the power grid scheduling unit shall perform the reactive voltage control against the distributed resources in accordance with the scheduling agreement.

8 Power grid abnormal response

8.1 As for the distributed resource directly connected to the public power grid through the 10 (6) kV voltage level AND the distributed resource connected to the power grid through the 35 kV voltage level, it shall have the low voltage ride through capability, AND the low voltage ride through amplitude and time shall comply with the requirements of GB/T 33593 -2017.

8.2 As for the distributed resource directly connected to the public power grid through the 10 (6) kV voltage level AND the distributed resource connected to power grid through the 35 kV voltage level, when the power grid connection point voltage U is above 110% of the rated voltage, it shall operate in the following methods.

a) 110% UN < U < 135% UN, the distributed resource shall be disconnected from the power grid within 2 s;

b) 135% UN <= U, the distributed resource shall be disconnected from the power grid within 0.2 s.

8.3 As for the distributed resource connected to the 220/380 V power grid AND the distributed resource connected to the user side through the 10 (6) kV voltage level, when the power grid connection point voltage U is abnormal, it shall operate in accordance with the methods as listed in Table 1; AND in case of abnormality of any phase of voltage in the three-phase system, it shall also operate in accordance with this method.

Voltage at power grid connection point Requirements U < 50% UN The distributed resource shall be disconnected from the power upload it regularly; as for the distributed resources connected to the 220/380V power grid, it shall record the power quality indicator statistical value every 10 min, AND it shall store at least 1 month of power quality data.

9 Power quality monitoring

9.2 After the distributed resource connected to the power grid, when the power quality at the public connection point does not comply with the requirements of GB/T 33593-2017, it shall produce alarm information; […]