It is foreseeable that battery energy storage systems will play an important role in power frequency regulation.

　　In recent years, new energy sources such as wind power and photovoltaics, which rely on the weather, have begun to be connected to the grid on a large scale. Due to the intermittent nature of these power sources, the pulse of the power grid will inevitably become a little chaotic. As for the right medicine, traditional thermal power and hydropower unit frequency modulation is still insufficient, and another good medicine is needed, that is, battery energy storage.

　　Since 2018, thermal power and energy storage joint frequency regulation projects have developed from a spark to a prairie fire, with the number of projects increasing to more than 20. The regional market has also spread from North China Power Grid to West Inner Mongolia Power Grid and China Southern Power Grid, and investment entities and profit sharing models have become increasingly diversified.

　　With the advent of the energy storage era, the state and local governments have issued a series of detailed support policies. It is foreseeable that battery energy storage systems will play an important role in power frequency regulation.

　　establish legal status

　　At present, my country's frequency-regulated power sources are mainly thermal power units. By adjusting the active power output of the units, the frequency changes of the system are tracked. However, the response time lag of thermal power units is long, the unit ramp rate is low, and the frequency regulation instructions of power grid dispatching cannot be accurately tracked. There are phenomena such as adjustment delay, adjustment deviation, and adjustment reversal. Moreover, the frequent power changes of thermal power units will increase the fatigue and wear of the unit equipment and affect the operating life of the unit. In comparison, hydropower units respond quickly and can reach full power output within a few seconds. However, the construction of hydropower units is restricted by geographical conditions, and the overall frequency regulation capacity that can be provided is relatively limited. New frequency regulation methods are urgently needed to meet the frequency regulation requirements of the power grid.

　　As a battery energy storage system, it has fast response speed, strong short-term power throughput capability, and flexible adjustment. It can achieve full power output within milliseconds to seconds and achieve precise control at any power point within the rated power. Research shows that the frequency regulation efficiency of an energy storage system with a continuous charge/discharge time of 15 minutes is approximately 1.4 times that of hydropower units, 2.2 times that of gas-fired units, and 24 times that of coal-fired units.

　　Although battery energy storage has obvious advantages in frequency regulation, it has only been in the past year or two that its independent legal status has been established. In June 2016, the National Energy Administration issued the "Notice on Promoting Electric Energy Storage's Participation in the Pilot Work of the Compensation (Market) Mechanism for Electric Power Auxiliary Services in the "Three North" Regions", which for the first time gave electric energy storage facilities the independent legal status to participate in auxiliary services. .

　　In October 2017, the National Development and Reform Commission, jointly with the Ministry of Finance, the Ministry of Industry and Information Technology, the Ministry of Science and Technology, and the Energy Administration issued the "Guiding Opinions on Promoting the Development of Energy Storage Technology and Industry", stating that "energy storage systems and units are allowed to participate in auxiliary service transactions jointly or as independent entities. "The market mechanism for energy storage to participate in power frequency regulation ancillary services has been initially established. That year, many provinces such as Shandong and Xinjiang successively issued and updated operating rules for the electric power auxiliary services market. Compensation fees for power frequency regulation ancillary services continue to grow. Energy storage has appeared many times in the new policies of various provinces, and its important position in power frequency regulation auxiliary services has gradually become prominent.

　　Attack the disease directly

　　With the large-scale grid connection of high-penetration wind power and photovoltaics, the problem of insufficient existing frequency regulation capacity has become increasingly prominent, and new frequency regulation methods are urgently needed. To improve the frequency stability of the power grid, it is necessary to improve the regional AGC control performance, that is, to improve the response ability of the unit to the AGC signal, including response time, adjustment rate, adjustment accuracy and other indicators. With the massive access to new energy sources and the development limitations of traditional power units, battery energy storage technology has become a focus of attention for new frequency modulation auxiliary means due to its fast and accurate power response capabilities.

　　Research shows that the Battery Energy Storage System (BESS) can complete AGC dispatch instructions within 1 second, which is almost 60 times the response speed of thermal power units; at the same time, a small amount of energy storage can effectively increase the power mainly based on thermal power The overall frequency modulation capability of the system. Large-scale battery energy storage systems have fast response times, strong short-term power throughput capabilities, and are easy to change the adjustment direction. When combined with conventional frequency modulation power supplies, they can be used as an effective means to assist traditional frequency modulation units. The rapid response and accurate tracking capabilities of the battery energy storage system make it more efficient than conventional frequency regulation methods, which can significantly reduce the spinning reserve capacity required by the power grid; the spinning reserve capacity saved by the battery energy storage system's participation in frequency regulation can be used for grid peak shaving and emergency backup etc., which can further improve the safety and reliability of power grid operation.

　　In addition to its technical advantages, the battery energy storage system can not only save the investment and operating costs of the power system, reduce coal consumption, and improve static benefits when participating in power grid frequency regulation, but also can meet the needs of system operation due to its fast response and flexible operation. to produce dynamic benefits based on frequency modulation requirements.

　　A stone from another mountain?

　　Abroad, all aspects of battery energy storage technology have gradually matured, especially in the United States, Chile, Brazil and Finland, where theoretical research and demonstration verification have been carried out for large-scale battery energy storage systems to participate in power frequency regulation.

　　In my country, the research and demonstration of battery energy storage technology participating in power grid frequency regulation is still in its infancy and reference stage. Judging from the energy storage demonstration projects currently constructed in China, the participation of battery energy storage systems in power frequency regulation has gradually been recognized and valued by the industry. Although more in-depth research and demonstration application work has not yet been carried out, the participation of energy storage technology in power frequency regulation It will be an important scientific issue that must be paid attention to in future smart grids.

　　my country has carried out relatively little theoretical analysis and research on the application of large-capacity energy storage technology to power system frequency regulation, and application demonstrations are still in their infancy. However, although foreign energy storage technology has become mature, its grid structure and energy structure are far different from those in our country. Therefore, it is urgent to explore energy storage participation in power frequency regulation technology that meets the characteristics of our country's power grid, and increase the use of energy storage in power frequency regulation. Necessity and value analysis, basic theoretical research and demonstration research in the field of frequency regulation auxiliary in my country, the use of energy storage to better serve power frequency regulation and serve the new generation of "strong" and "smart" power grids.

Read recommendations:

7/AAA USB 1.5V 600mWh

Is it necessary for model Xiaobai to go to an ultra -high multiplier battery?energy storage battery

The requirements of the rechargeable battery.9.6kwh energy storage lithium solar battery

18650 battery pack wholesale

CR2477 battery