GB/T 38953-2020 in English
VALIDTechnical requirements for relay protection of microgrid
- Issued on:2020-06-02
- Implemented on:2020-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$117.00
《GB/T 38953-2020微电网继电保护技术规定》由TC564（全国微电网与分布式电源并网标准化技术委员会）归口，主管部门为中国电力企业联合会。
Introduction
Analysis of the core content of the standard
GB/T38953-2020 is my country's first technical standard specifically for microgrid relay protection. It systematically stipulates the protection configuration requirements for microgrids with voltage levels of 35kV and below. The standard highlights the following technical features:
| Protection type | Key technical requirements | Innovation points |
|---|---|---|
| Distributed power supply protection | Directional overcurrent protection and overload protection must be configured | For the first time, it is clarified that converter type power supplies must be configured with bidirectional protection |
| Electrochemical energy storage protection | Need to be linked with the energy storage converter operation mode | Emphasis on protection-control coordination mechanism |
| Grid connection point protection | Mandatory configuration of differential protection + anti-islanding protection | Establish a multi-level protection coordination system |
Detailed explanation of key technical requirements
1. Distributed power protection
Chapter 5 of the standard specifically stipulates: Converter type distributed power must be equipped with positive and negative overcurrent protection, where positive protection is used to remove internal faults (action time ≤ 0.1s), and negative protection is used to isolate external faults. This is fundamentally different from traditional distribution network protection:
Typical case: Actual measurements of a photovoltaic microgrid show that when the bidirectional protection scheme recommended by the standard is adopted, the fault removal success rate is increased from 82% to 99.6%.
2. Innovation of grid connection point protection
Chapter 8 of the standard proposes a three-level defense system:
- Differential protection as the main protection (action time ≤30ms)
- Directional overcurrent protection as the backup protection
- Frequency and voltage decoupling device as the final guarantee
Implementation suggestions
1. Protection setting principle
According to Article 4.2 of the standard, setting needs to consider:
- Microgrid operating conditions (grid connection/island)
- Distributed power penetration
- Fault ride-through capability requirements
2. Communication system construction
Article 4.5 of the standard clearly requires the use of DL/T667-103 protocol. In actual deployment, please note:
- GOOSE message transmission delay ≤4ms
- Time synchronization accuracy ≤1μs
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