As the key support point of the energy revolution, energy storage has an important strategic position in the process of building a modern energy supply system in China. Energy storage is the key technology to promote the development of energy oil, fossil to wind, photovoltaic and other renewable energy, and is also the focus of solving the energy crisis. The rapid development of lithium-ion battery energy storage system is an important part of China's renewable energy transformation and 2030 carbon peak strategy, and it is also one of the most feasible ways to meet the soaring energy demand and solve environmental problems.
Ankejie summarized the requirements for energy storage systems in the "Design Standards for Electrochemical Energy Storage Power Stations (for Comments)" recently published on the website of the Ministry of Housing and Urban-Rural Development of the People's Republic of China, including batteries (potassium ions), battery management systems, and converters. Technical requirements for reference.
Scope
power for new construction, expansion or alteration fixed electrochemical energy storage of 500kW and capacity of 500kWh and above station.
General provisions for energy storage systems:
1. The energy storage system shall be designed according to application requirements, access voltage level, rated power of energy storage power station, rated capacity of energy storage power station, performance of energy storage converter, type, characteristics and requirements of electrochemical energy storage and short-circuit current tolerance of equipment;
2. The selection of energy storage system should be determined by comprehensive application requirements, battery characteristics and construction conditions, technical economy and other factors, and hybrid type can be adopted;
3. The capacity of the energy storage unit shall be determined by combining the voltage level of the DC side, the breaking capacity of the DC side circuit breaker and the selection of the energy storage converter after technical and economic comparison;
4. Energy storage system equipment should choose energy saving environmentally friendly, intrinsically safe, efficient, reliable and less maintenance equipment;
5. The electrical equipment arranged in the battery room shall comply with the provisions of GB 50058, the current national standard "Code for Design of Electrical Devices in Explosive Hazardous Environments.
Lithium-ion battery requirements
1. The technical requirements of lithium-ion batteries shall comply with the relevant provisions of the current national standard "Lithium-ion Batteries for Power Energy Storage" GBT36276 the current industry standard "Technical Specification for Lithium-ion Batteries for Electrochemical Energy Storage Power Stations" NBT 42091-2016;
2. The battery should have safety protection design. In the process of charging and discharging, when the external encounters various unexpected factors such as open fire, impact, lightning, short circuit, overcharge and overdischarge, there should be no explosion; 3. The battery should adopt modular design. The rated voltage of lithium ion battery module should be 38.4V, 48V, 51.2V, 64V, 128V, 153.6V, 166.4V and other series. 4. The grouping mode and connection topology of the battery system should match the topology of the energy storage converter, and the number of parallel batteries should be reduced; 5. The battery system should be equipped with DC circuit breakers, isolating switches and other breaking and protection equipment;
6. The redundancy of battery configuration should be configured according to the attenuation characteristics, charge and discharge characteristics, economy and application scenarios of the battery; 7. The DC side voltage should be determined according to the battery characteristics, withstand voltage level and insulation performance, and should not be higher than 2kV;
8. The DC side grounding type shall comply with the provisions of GB/T16895.1, the current national standard "low voltage electrical installations part 1: basic principles, general characteristics evaluation and definitions.
Battery Management System Requirements
1. The power supply can be AC or DC power supply, of which the rated voltage of AC power supply is 220/380V and the rated voltage of DC power supply is 110V or 220V;2. The insulation resistance value between the live parts connected to the battery and the shell of the battery management system shall not be less than 2MQ;
3. The battery management system should be subjected to insulation and withstand voltage performance test, and there should be no breakdown or flashover and other destructive discharge phenomena during the test;
4. The measurement error of the detected state parameters shall not be greater than the following provisions: total voltage value: 1% full-scale current value: 0.2 full-scale temperature value 2 ℃ single-section voltage value: 10mV
5.SOC estimation accuracy should not be greater than 8%, should have self-calibration function, and the calculation update period should not be greater than 3S;
6. It shall be able to run continuously for 1.00h at the upper and lower limits of the power supply voltage, and the measurement accuracy of state parameters shall meet the requirements;
7. The operating status of the battery should be fully monitored, including the voltage, current, temperature and battery charge of the monomer/module and battery system;
8. Should have over charge/over discharge protection, short circuit protection, over current protection, temperature protection, leakage protection and other functions;
9. It is appropriate to configure the soft and hard wiring outlet, when the protection action, send an alarm or trip signal to inform the energy storage converter and computer monitoring system;
10. The equalization function of the battery management system should be reasonably configured according to the battery characteristics;
11. Should support IEC61850, CAN2.0B, Modbus TCP-IP or DL/T 860 communication, cooperate with the energy storage converter and the station monitoring system to complete the monitoring and protection of the energy storage unit; 12. The technical requirements of the lithium-ion battery management system should comply with the current national standard "Technical Specification for Lithium-ion Battery Management System for Electrochemical Energy Storage Power Station" GB/T34131.
13. The energy storage unit should have the function of insulation monitoring. The insulation monitoring can be realized by the battery management system or the energy storage converter. When the insulation of the energy storage unit is low, it should be able to send an alarm and or trip signal to inform the energy storage converter and the computer monitoring system.
3. The energy storage converter shall conform to the provisions of the current national standard "Technical Specification for Energy Storage Converter of Electrochemical Energy Storage System" GB/T34120. The energy storage converter shall have protection functions, including short circuit protection, polarity reverse connection protection, DC over-voltage protection, over-current protection, over-temperature protection, AC incoming line phase sequence error protection, communication fault protection, cooling system fault protection and anti-islanding protection.
4. The communication protocol between the energy storage converter and the computer monitoring system should be determined according to the response time requirements of the power system to the energy storage station.
Above is ancojet testing and certification of energy storage systems, lithium-ion batteries. The introduction is for reference only. Some of the materials come from the Internet and do not represent the views of Ankorset's detection technology and are responsible for its authenticity. If you are involved in the content of the work, copyright and other issues, please contact us within 30 days, we will delete the content in the first time!
