GB/T 38946-2020 in English

The GB/T38946-2020 standard builds an operation and maintenance system that includes centralized monitoring, intelligent diagnosis, and hierarchical response for distributed photovoltaic power generation systems of 35kV and below. Its technical framework includes three modules: the master station system (data processing center), the substation system (field station data collection), and the communication network.

Rooftop photovoltaic cluster operation and maintenance

After centralized operation and maintenance of 12 rooftop photovoltaic projects (total capacity of 25MW) in an industrial park:

• Using the centralized operation and maintenance master station to achieve unified monitoring, the fault location time is shortened by 82%
• Using the infrared thermal imager to discover 13 hidden cracked components 3 months in advance
• Annual operation and maintenance costs are reduced by 370,000 yuan

System construction phase

1. The master station should be configured with dual-machine hot standby, and the server MTBF ≥ 4000 hours
2. The data storage period of the substation is not less than 7 days, and the sampling interval is ≤ 5 minutes
3. The communication channel needs to be independently configured with a video dedicated network, with a bandwidth ≥ 10Mbps

Daily operation and maintenance stage

• Establish a three-level defect management system (critical/serious/general)
• Component cleaning evaluation needs to combine irradiance sensor data and dust loss model
• Safety tool inspection strictly implements the DL/T1476 cycle requirements

The development direction of intelligent operation and maintenance pointed out in Clause 6.9 of the standard: