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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Electricity Council (CEC).
This standard is under the jurisdiction of the National Technical Committee on Power Energy Storage of Standardization Administration of China (SAC/TC 550).
Technical Specification for Power Conversion System of Electrochemical Energy Storage System
1 Scope
This standard specifies the relevant contents such as terms and definitions, product classification, technical requirements, inspection rules, marking, packaging, transportation and storage of AC-DC transfer type three-phase power conversion system used in electrochemical energy storage system.
This standard is applicable to low-voltage three-phase power conversion system with electrochemical battery as energy storage carrier, whose highest voltage at DC side shall not be greater than 1 000V.
Note: Power conversion system adopted by supercapacitor and other types of energy storage system may refer to this standard.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 191 Packaging - Pictorial Marking for Handling of Goods
GB/T 2423.3 Environmental Testing for Electric and Electronic Products - Part 2: Testing Method Test Cab: Damp Heat, Steady State
GB/T 2423.4 Environmental Testing for Electric and Electronic Products - Part 2: Test Method - Test Db: Damp Heat, Cyclic (12h+12h Cycle)
GB/T 3859.2 Semiconductor Converters - General Requirements and Line Commutated Converters - Part 1-2: Application Guide
GB/T 4208 Degrees of Protection Provided by Enclosure (IP Code)
GB/T 7251.1 Low-voltage Switchgear and Controlgear Assemblies Part 1: Type-tested and Partially Type-tested Assemblies
GB/T 12326 Power Quality - Voltage Fluctuation and Flicker
GB/T 13384 General Specifications for Packagings of Mechanical and Electrical Products
GB/T 14549 Quality of Electric Energy Supply - Harmonics Inpublic Supply Network
GB/T 15543 Power Quality - Three-phase Voltage Unbalance
GB/T 15945 Quality of Electric Energy Supply - Permissible Deviation of Frequency for Power System
GB/T 17626.2-2006 Electromagnetic Compatibility (EMC) - Testing and Measurement Techniques - Electrostatic Discharge Immunity Test
GB/T 17626.3-2006 Electromagnetic Compatibility - Testing and Measurement Techniques - Radiated Radio-frequency Electromagnetic Field Immunity Test
GB/T 17626.4-2008 Electromagnetic Compatibility - Testing and Measurement Techniques - Electrical Fast Transient/Burst Immunity Test
GB/T 17626.5-2008 Electromagnetic Compatibility - Testing and Measurement Techniques - Surge Immunity Test
GB/T 17626.6-2008 Electromagnetic Compatibility - Testing and Measurement Techniques - Immunity to Conducted Disturbances Induced by Radio-frequency Fields
GB 17799.4 Electromagnetic Compatibility(EMC) - Generic Standards - Emission Standard for Industrial Environments
DL/T 860 Power Plants Automatic Communication Network and System
3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
3.1
electrochemical energy storage system
equipment system using electrochemical battery as energy storage carrier to carry out recyclable power energy storage and release via converter
3.2
battery module
combination of multiple single batteries managed by the minimum monitoring control unit in battery management system and assembling with necessary devices for application (e.g. enclosure , terminal, interface, sign as well as protection device)
3.3
power conversion system; PCS
converter to realize power bilateral transfer, which is connected between battery system and power grid (and/or load) in electrochemical energy storage system
3.4
converter efficiency
the ratio of power storage converter output active power to input active power, in %, where, the ratio of output active power at DC side to input active power at AC side is rectification efficiency when power grid stores power to battery module and the ratio of output active power at AC side to input active power at DC side is inversion efficiency when battery module releases power to power grid
3.5
grid mode
the operation mode of storing power of power grid into battery module or feedbacking battery module energy to power grid with power conversion system synchronously interconnected to AC power grid and operating in the characteristic of current supply
3.6
islanded mode
the operation mode in which power conversion system operates in the characteristic of voltage source to provide power for power grid connected at AC side of energy storage system
3.7
transfer time between charge and discharge
the time required for transfer between charge state and discharge state of energy storage system, which generally refers to the average of required time from charge state of 90% rated power transferring to discharge state of 90% rated power and from discharge state of 90% rated power transferring to charge state of 90% rated power
3.8
stabilized current precision
the stability of output current corresponding to any value which is stable within the range of rated value of output current at DC side of power conversion system when electrochemical energy storage system is in operating status of constant current
3.9
stabilized voltage precision
the stability of output voltage corresponding to any value which is stable within the adjustable range of output voltage at DC side of power conversion system when electrochemical energy storage system is in operating status of constant current
4 Product Classification
4.1 Operation mode and corresponding requirements
According to different operation modes, power conversion systems are classified into grid mode, islanded mode and grid-islanded mode and refer to Table 1 for their corresponding performance indexes and requirements.
Table 1 Requirements for Power Conversion System in Different Operation Modes
No. Functional and performance requirements Operation mode
Grid mode Islanded mode Grid-islanded mode
1 Efficiency √ √ √
2 Loss √ √ √
3 Overload capacity √ √ √
4 Current total harmonic distortion √ √
5 DC component √ √
6 Voltage fluctuation and flicker √ √
7 Power control precision √ √
8 Power factor √ √
9 Stabilized current precision and current ripple √ √
10 Stabilized voltage precision and voltage ripple √ √
11 Power grid adaptability √ √
12 Low voltage ride through √ √
13 Switching time of charge and discharge √ √
14 Voltage deviation √ √
15 Voltage total harmonic distortion √ √
16 Voltage unbalance factor √ √
17 Dynamic voltage transient range √ √
18 Temperature rise √ √ √
19 Noise √ √ √
20 Environment √ √ √
Note: Refer to Annex A for technical parameter of power conversion system.
4.2 Main parameters
4.2.1 Voltage grade at AC side of power conversion system
The following series are adopted in priority for voltage grade (kV) at AC side of power conversion system:
0.38 (0.4), 0.66 (0.69) and 1 (1.05).
4.2.2 Rated power grade of power conversion system
The following series are adopted in priority for rated power grade (kW) of power conversion system:
30, 50, 100, 200, 250, 500, 630, 750, 1 000, 1 500 and 2 000.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 Product Classification
5 Technical Requirements
6 Inspection
7 Marking, Packaging, Transportation and Storage
Annex A (Informative) Technical Parameter Table for Power Conversion System
Annex B (Informative) Selection of Anti-islanding Protection Scheme
