GB/T 33593-2017Technical requirements for grid connection of distributed resources (English PDF)

3.1 Distributed resources

It refers to the resources which are connected to the power grid of 35 kV and below voltage level, located close to the user, AND mainly consumed locally at 35 kV and below voltage level, which includes synchronous generators, asynchronous generators, converters, and other types of resources.

Note: It includes solar energy, natural gas, biomass energy, wind energy, water energy, hydrogen energy, geothermal energy, ocean energy, comprehensive utilization of resources (including coal mine gas power generation), and energy storage and other types.

3.2 Converter

It refers to an electrical device for converting electrical power into one or more types of electrical powers that is suitable for use by the power grid or user.

Note: The converter includes rectifiers, inverters, AC converters, and DC converters.

3.3 Converter-type power supply

It refers to the power supply which is connected to the power grid totally or partially through the converter.

3.4 Synchronous-machine-type power supply

8.1 General requirements

8.1.1 The grounding mode of the distributed resource shall be compatible with the grounding mode at the power distribution network side, AND it shall comply with the requirements of personal & equipment safety, protection, and coordination.

8.1.2 As for the distributed resources connected to the power grid through the 380 V voltage level, it shall install a switch at the power grid connection point which is easy to operate, have obvious on/off indication, AND have the fault current on/off capability.

8.1.3 As for the distributed resources connected to the power grid through the 10 (6) kV ~ 35 kV voltage level, it shall install a switching equipment at the power grid connection point which is easy to operate, can be locked, have apparent on/off point, have grounding function, AND have the fault current on/off capability.

8.2 Safety signs

8.2.1 As for the distributed resources connected to the power grid through the 380 V voltage level, the dedicated low voltage switchgear which is connected to the power supply and power grid shall have eye-catching signs. The signs shall be indicated of such suggestive text and symbol as "warning", "dual power supply", etc. The shape, color, size, and height of the sign shall follow the requirements of GB 2894.

8.2.2 As for the distributed resources connected to the power grid through the 10 (6) kV ~ 35 kV voltage level, it shall follow the requirements of GB 2894, to indicate such suggestive text and symbol as "be careful of electric shock", etc., nearby the electric equipment and circuit.

8.3 Lightning protection and grounding

The lightning protection and grounding of the distributed resource shall comply with the relevant requirements of GB 14050 and DL/T 621.

9.1 General requirements

The protection of distributed resource shall comply with the requirements of reliability, selectivity, sensitivity and speed, AND its technical conditions shall comply with the requirements of GB/T 14285 and DL/T 584.

9.2 Voltage protection

shall be matched with the power distribution line side re-closure and safety automatic device action time.

10.1 General requirements

10.1.1 As for the distributed resources connected to the power grid through the 380 V voltage level AND the distributed resources connected to the user side through the 10 (6) kV voltage level, it may use such communication methods as wireless, optical fiber, and carrier wave, etc. When using the wireless communication method, it shall take the information communication safety protection measures.

10.1.2 As for the distributed resources directly connected to the public power grid through the 10 (6) kV voltage level AND the distributed resources connected to the power grid through the 35 kV voltage level, it shall use the dedicated network communication method, have the capability of data communication with the power grid scheduling institute, be able to collect the electrical operation status of the power supply, upload it to the power grid scheduling institute, AND meanwhile have the capability of accepting the controlling and regulation order from the power grid scheduling institute.

10.1.3 As for the distributed resources directly connected to the public power grid through the 10 (6) kV voltage level AND the distributed resources connected to the power grid through the 35 kV voltage level, the communication method and information transmission between the power grid scheduling institute shall comply with the secondary safety protection requirements of the power system. The telemetry, remote signaling, remote control, remote regulation signals of the transmission may be based on the communication protocols of DL/T 634.5104 and DL/T 634.5101. […]

10.2 Normal operation