GB/T 34120-2023
Technical requirements for power conversion system of electrochemical energy storage system (English Version)

Standard No.

GB/T 34120-2023

Language

Chinese, Available in English version

Release Date

2023

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 34120-2023

Replace

GB/T 34120-2017

Introduction

Core changes in the standard revision

Technical dimensions	Requirements of the 2017 version	New/revised content of the 2023 version
Voltage level	Upper limit not specified	The upper limit of the AC port voltage is determined to be 35kV
Functional requirements	Basic power control	8 new functions such as primary frequency modulation and inertia response
Safety protection	Basic insulation requirements	3 new requirements such as equipotential connection and capacitor residual energy protection

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Analysis of key technical indicators

Core parameters of electrical performance

Energy storage converters must meet the following requirements under rated operating conditions:

• Four-quadrant power dynamic adjustment range: active/reactive output is continuously adjustable within ±110% rated value
• Conversion efficiency: Class A1 equipment charging and discharging efficiency ≥96% (including auxiliary power loss)
• Fault ride-through capability: 0V voltage lasts for 150ms without disconnection from the grid

Comparison of typical application scenarios

Classification basis	Class A1 (high voltage grid connection)	Class B2 (low voltage power distribution)
Voltage level	＞1000V	380V
Dynamic reactive response	≤30ms	Optional
Protection level	IP54 (outdoor)	IP20 (indoor)

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Standard implementation recommendations

Product development focus

1. Topology selection: Cascade topology is suitable for high voltage scenarios of 10kV and above
2. Fault ride-through algorithm optimization: Need to support 3 consecutive low-high voltage ride-throughs
3. Safety protection design: capacitor discharge time ≤ 5s (60V/20J)

Key points for testing and certification

• Electromagnetic compatibility testing needs to distinguish between A1/B2 equipment limits
• Type inspection includes 72-hour salt spray test (outdoor type)
• Factory inspection requires 100% power frequency withstand voltage test

Technology evolution analysis

This standard introduces the inertia response requirement for the first time (formula: ΔP=-T_j/f_n×df/dt×P_n), promoting the upgrade of energy storage systems from simple power regulation to grid support functions, where:

• Inertia time constant T_j is set to 4-14 seconds
• Response time ≤ 100ms, adjustment time ≤ 300ms