Energy storage technology is applied in multiple scenarios, safety and
economy are important considerations
The energy storage industry has become a strategic emerging industry, with
a huge market and accommodating diverse cooperation. At present, various
technical routes have their own merits, and various application models emerge in
endlessly. Industry experts believe that the key to energy storage technology is
to be customer-centered, based on the objective needs of actual application
scenarios, design and configure highly suitable energy storage systems, and
fully tap the economic value of energy storage systems in different application
scenarios. What are the advantages of different new technologies in improving
the economics and safety of behind-the-meter energy storage? In the future,
users can make different decisions based on their own needs. Multiple stations
integrated into one to meet the city’s comprehensive energy needs. In March this
year, the construction of the electrochemical energy storage power station with
the largest domestic capacity began in Nanjing Jiangbei New District. According
to reports, Jiangbei Energy Storage Power Station has a maximum charge and
discharge power of 130,880 kilowatts and a total storage capacity of 268,600
kilowatt hours. It is the electrochemical energy storage power station with the
largest capacity under construction in China. As the first urban energy complex
in China, it includes a transformer substation. , energy storage power stations,
electric vehicle charging stations, distributed photovoltaic power stations and
data centers. As one of the important projects in Jiangsu to build a "smart
city", Jiangbei Energy Storage Power Station will subsequently plan to explore
the construction and operation of a "multi-station-in-one" approach of
substation + energy storage station + photovoltaic charging station + data
center to achieve energy, Data integration and sharing. "Multi-station
integration includes substations, data centers, comprehensive energy stations,
5G, etc. to achieve energy exchange. The entire large power grid is also an
energy storage system, but it is just dynamic energy storage." Director and
professor of the Microgrid Office of the Power Distribution Institute of the
Chinese Academy of Electric Power Sciences Senior engineer Wu Ming told
reporters. It is understood that the energy station technology based on
all-in-one power transformation, energy storage, charging, distributed power
supply, data center, and communication base station will break the bottleneck of
the mismatch between the rapid growth of energy loads and electric vehicles in
large cities and the development of the power grid, and improve The
comprehensive efficiency and benefits of the power grid can improve the
absorption capacity of new energy, improve the reliability of power supply, and
meet the comprehensive requirements of urban construction on energy and
environment. At the same time that the construction of the energy storage
station started, the construction of the 220 kV urban hub substation and the new
energy vehicle charging and swapping station also started. As the main function
of a traditional power station, the substation is compatible with the urban
energy complex, and is also equipped with a new energy vehicle charging and
swapping station. After completion, new energy vehicle users near the power
station can freely enter the park to charge and replace their vehicles. Wu Ming
believes that multi-station integration is an emerging model, in which many
technical details and quality of battery group systems, battery grid-connected
modes, control methods, measurement and control protection, and energy
management systems need to be further optimized and improved. It is understood
that the new concept and model of the urban energy complex is expected to be
gradually extended to central cities across the country. By then, more wind
power, photovoltaics and other clean energy can be stored for the city to use at
any time; every electric vehicle can become a "power bank" for urban mobility;
every electricity user can become a virtual power plant , energy realizes
two-way flow. Distributed power supply + energy storage realizes multiple energy
deployment and optimization. As an important aspect of smart city construction,
the smart energy Internet has received more and more attention. As a major
infrastructure, energy storage systems will play an "important role" in the
construction of smart cities. On the user side, they include multiple
application scenarios such as peak shaving and valley filling, demand regulation
and the extension of electricity sales and other fields. Tang Huanji, technical
director of Beijing Enterprises Smart Energy Co., Ltd., believes that current
energy development faces three main problems. First, as the proportion of
renewable energy power generation increases, the security and stability of the
power grid are threatened; second, the power supply model is becoming more
decentralized. With the development of power supply mode that is close to the
user side, the power supply reliability requirements are higher and the control
strategy is more complex. The third is the demand for rapid expansion of the
power grid brought about by the rapid growth of power load. As a flexible tool,
energy storage has become a supporting technology to solve the above problems
and is a rigid need in the process of energy development. Microgrid is currently
the most important application field of energy storage. Tang Huanji said that
when multiple "distributed power sources + energy storage" are combined, the
deployment and optimization of multiple energy sources can be achieved, that is,
a microgrid. As an indispensable part of microgrid, energy storage plays a vital
role in microgrid. In microgrid operation, there are two operating modes:
grid-connected operation mode and island operation mode. In the island operation
mode of the microgrid, energy comes from distributed energy sources and energy
storage batteries. When the output of the distributed energy resources is less
than the load demand, there will be a certain power shortage. The way to solve
the power shortage is to equip the microgrid system with Energy storage
equipment with a certain capacity. "For example, a photovoltaic power station in
Jiangsu with a capacity of 8MW has a battery energy storage system of 10MW/40MWh
and 10 charging pile systems. Its operation mode is that the electric energy
produced by the entire system is first supplied to the factory. If there is more
than the factory According to the electricity demand, the excess electricity is
transferred to the large power grid. This project effectively reduces the
factory's basic electricity bill through the intelligent control of the energy
management system, saving the factory 15% of its annual electricity bill." Tang
Huanji said, with At the same time, the project energy management system uses
artificial intelligence algorithms to provide voltage regulation and frequency
regulation services for the power grid. Lead-carbon battery energy storage
technology with long cycle life and good safety is mostly used in areas with
rapid economic development and huge power consumption. It is hoped that new peak
regulation methods can alleviate peak and valley power demand. Among the energy
storage technologies currently in use, electrochemical energy storage (battery
energy storage) has the advantages of fast response speed and accurate load
control. Its construction is not subject to geographical restrictions, has a
short construction period, relatively low cost, and does not consume fossil
fuels. , does not produce pollution emissions, so it has a relatively wide range
of applications and is more suitable for the current development needs of smart
microgrids. At the same time, battery energy storage can be used throughout all
aspects of power generation, transmission, distribution, and use, making the
rigid power system that is balanced in real time more flexible, ultimately
changing the basic form and function of the power system. Among battery energy
storage components, common carriers mainly include lead-acid batteries,
lead-carbon batteries, lithium-ion batteries, flow batteries, and sodium-sulfur
batteries. Different batteries have different performance characteristics.
Zhejiang Nandu Power Supply Co., Ltd., which has a large scale of domestic
energy storage projects in operation, mainly uses lead-carbon batteries in the
field of user-side energy storage. The relevant person in charge of the company
explained that lead-carbon batteries are a type of battery that will have
capacitive characteristics. Or an upgraded version of lead-acid battery in which
highly conductive carbon materials are added to the negative electrode. "It not
only maintains the high energy density of the battery, but also has the
characteristics of high power, fast charge and discharge, and long cycle life of
the supercapacitor. It also has a high cost advantage and good safety. The
company has invested in and constructed the largest commercialization project in
the world. Energy storage power station - the smart distribution network energy
storage power station in Singapore Industrial Park in Wuxi, Jiangsu uses
lead-carbon energy storage technology." The power station provides energy
storage services to the park at the power distribution end, and together with
the industrial park, provides comprehensive energy for park enterprises
Services, combining distributed renewable energy and smart microgrid technology,
realize multi-energy complementary and coordinated supply of traditional energy
and new energy. The above-mentioned person in charge added that this project is
mainly focused on peak shaving and valley filling, with functions such as
demand-side response, emergency power supply, and improvement of power quality.
It is also the first project in Jiangsu Province to install electricity meters,
and is simultaneously connected to Jiangsu Province’s power grid. The
interactive dispatching platform participates in the demand-side response of
Jiangsu Provincial Network and creates a new model of "investment + operation".
Wu Xianzhang, chief engineer of Zhejiang Nandu Power Supply Co., Ltd., said that
the company has proposed park-level "incremental distribution network +" energy
storage services based on advanced lead-carbon battery technology and mature
energy storage technology. Utilize the "virtual power plant" advantages of the
energy storage system to achieve precise management and intelligent operation of
power consumption in the park, and optimize the electricity bill management on
the distribution network side of the park. At the same time, it adjusts the peak
load balance of the park, provides smart energy-saving electricity and emergency
power supply, and achieves power demand-side response.
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