LR41 battery.New solutions for electrochemical energy storage in transmission and distribution networks

　　During the meeting, Liu Jialu, deputy chief engineer of Shenzhen Kelu Electronic Technology Co., Ltd., shared the theme report "New Solutions for Electrochemical Energy Storage in Transmission and Distribution Networks". The following is the full text of the speech:

　　Today's report mainly consists of three parts. The first part is an introduction to the new big three-type two-network background (45:55), and the last part introduces specific cases and the specific situation of the company.

　　This is the main architecture diagram of a three-type two-network model released by the Internet Department of the State Grid Corporation of China in March at the beginning of this year, which includes an energy storage grid with source, grid, and load storage (46:39). Needless to say, the internal business of the power grid is the traditional data chain and data power operation of the grid, and the external power is mainly value-added services. In fact, it is necessary to jointly build an ecosystem of new business forms. New business forms, new models, and new owners are mainly It is to build a new ecosystem. In fact, it is gradually expanding its business more into integrated energy services and other industrial fields, and beyond the power grid generation field.

　　On the one hand, the purpose of the new three-type two-grid is to improve the traditional operating efficiency of the power grid. On the other hand, it is also able to improve the operation mode and efficient coordination of its power grid through new technical means.

　　After the development of the power grid company over the years, the amount of information it dispatched after 2000 was very small, and the power grid at that time was only a one-way power supply from the power supply point to the user side transmission and distribution. After the popularity of new energy and electric vehicles over the years, the business of power grid companies has gradually expanded, especially as a large number of new energy sources have begun to intervene, and the amount of information collected from the user side, including the subsequent collection, has also gradually increased. Now the number of information points collected by a regional power grid has reached millions. With the further advancement of the ubiquitous power Internet of Things, a large amount of data will be connected to the power grid in the future. These data accesses actually provide more data foundation for the ubiquitous power Internet of Things. The next step is to integrate these data Its application is also a very important next step for power companies.

　　Let me mention here that there is a big difference between the energy Internet and the traditional information Internet, because energy is a non-replicable quantity, and information can be easily circulated and transmitted on the network, including the replication of its information. All very easy. Energy storage has always been a problem. Traditionally, the storage of electricity through power storage stations has always been a matter of great concern, because the power grid stores energy. The two main points will be introduced later, because electric energy requires instantaneous balance, and in different areas, In different spaces and times, the value reflected by the price is also different. There are different periods of the day. The supply and demand are different in different periods, and the prices are also different.

　　Its usage and value are also very different between power generation areas and areas with tight power consumption.

　　This is the value of different time periods. The pricing mechanism currently used in China still formulates different pricing according to fixed time periods. Foreign developed countries use real-time pricing, which may have a higher electricity price difference. The electricity price during a certain tense period will be higher, and the electricity price during a certain low period will be lower.

　　The following introduces new solutions for energy storage on the grid side. At present, many people are familiar with the applications of energy storage in these four fields. Here I will briefly introduce the current overall situation to you. Our company has also done a large number of thermal power plant frequency regulation projects for energy storage on the power generation side. The energy storage on the power generation side is related to the assessment rules of the thermal power plants in the region, and is closely combined with some local power auxiliary services. Policies to serve the market. At present, energy storage on the power generation side is a project with the shortest payback period and the best investment return among electrochemical energy storage. But it has certain selectivity, and not all thermal power plants can participate in this project.

　　The second type of projects is for the grid side. The focus today is on energy storage on the grid side of the transmission and distribution network. Grid-side energy storage does not have a very strict definition so far. I personally understand it this way. The definition of grid-side energy storage is relatively simple. It is managed by the power grid company and can be of value to the power grid company. The value it exerts It is for the value on the grid side, this type of energy storage. Including those built and operated by the power grid company. Later, with the introduction of new policies, energy storage that may be constructed by a third party, operated by a third party but dispatched by the power supply network company to solve some key problems in the power grid can be regarded as grid-side energy storage.

　　The third category is peak-shaving and valley-filling on the user side, which Mr. Xu of the Jiangsu Provincial Company has also talked about before.

　　The last part is the new energy grid connection side. The energy storage of new energy is mainly to solve the problem of new energy consumption and improve the grid connection capacity of new energy in the region. New energy storage is mainly aimed at large-scale photovoltaic power stations and energy storage power stations in the northwest region. This is also closely integrated with local policies.

　　Let’s introduce some of the main values on the grid side. The current heroic deeds on the grid side are mainly large-scale energy storage power stations built on the side of substations. It serves as a link between the previous and the next, solving a certain load for the entire downstream power transmission area and the lower-level central distribution network and power distribution area. It has several aspects. One is to solve the load gap of the power company in the supply area, and the other is to solve the two problems of new energy grid integration in the area (53:03). At present, its main function is to solve the current power load gap in different periods, including seasonal periods and time periods. It is necessary to say that energy storage on the grid side and peak shaving and valley filling on the user side are necessary. The big difference is that user-side peak shaving and valley filling are all aimed at making profits based on electricity price periods. The economic benefits of power grid companies connecting to power grid energy storage are not so easy to calculate. It is more about a specific time period. To solve it internally, we use dispatching methods to solve some load demand gaps in the power grid, such as power supply in summer and air conditioning and refrigeration load in summer, which are concentrated in a certain time period. Another one is the heating load in winter and some load fluctuations during important time periods every day.

　　As an important hub connecting the backbone power grid and the medium-voltage distribution king, the substation has also proposed the concept of multi-station integration. Now the State Grid Corporation of China is also promoting a multi-station comprehensive substation, which mainly includes six stations integrated into one. In traditional substations On the basis of this, data cores and communication base stations are added, including Beidou satellite base stations, 5G communication base stations, electric vehicle charging and swapping stations, energy storage stations, and distributed energy stations. The energy storage station plays an important regulating role here, because distributed energy also serves as an intersection node. On the other hand, the charging of electric vehicles will also bring great fluctuations to the power supply in local areas. Another is that for connected data centers and communication base stations, energy storage stations can be used as their backup power sources. and important power supply safety guarantee. In this way, the multi-station integrated substation in the entire station can actually play the role of shared type, hub type and platform type among the three types proposed by the power grid company. All of them can be installed in the multi-station integrated substation. play an important role.

　　This is related work done in energy storage stations, which serve as a source, grid and load storage (55:51). This is a main access topology diagram, which is connected to the central network line of the substation. In addition to this, now in our new grid-side energy storage, we actually do dispatch-side energy storage from three aspects. , not only at the point of substations, because some substations cover an area including the space they occupy, and it is impossible to build a sufficient amount of substations. Many substations require more than ten or twenty containers, and there are not so many in the station. When the area is reduced, we can also deploy energy storage stations on some lower-level transmission networks and some important nodes. At the middle and rear ends of the line, adding an energy storage station to some weak areas can also play a very good role in regulating the active power supply capacity of the lower levels.

　　The third one is on the platform side. In fact, the third one is segment. Adding an energy storage to the end of the platform side can solve the problem of energy storage for users in the platform area with a relatively large gap. For energy storage in the Taiwan area, we use modules that can be combined and small cabinets. A small cabinet can hold lithium battery modules ranging from 60 kWh to 200 kWh. According to the space and specific requirements of the area, Flexible combinations are required. Three 120. What we are currently building is a 125 kWh Taiwan area energy storage cabinet. Three units are about 375 kWh. The area is about the same as that of a traditional box-type substation. This is also very space-saving and very flexible. , and it is connected to the voltage side. This kind of energy storage can be controlled according to three nodes such as substation energy storage and station area energy storage to maximize the effect of energy storage. This type of small energy storage can be combined with a columnar (sound) transformer to solve the problem of relatively long cycle and high cost.

　　These are mainly cloud platform management of energy storage, mainly including data monitoring.

　　The last picture briefly talks about the comprehensive role of grid-side energy storage. In summary, it includes frequency regulation, voltage regulation and peak shaving, backup power supply, and black-start power supply. The embodied value includes reducing the expansion of power generation, transmission and distribution equipment, improving grid design utilization, reducing the pressure on frequency and peak regulation of thermal power plants, and smoothing peaks and valleys. From the current perspective of power grid assets, State Grid Corporation of China is also facing huge pressure to make profits, because now the benchmark electricity price is going to fall further, and the benchmark electricity price for industry and commerce has been further reduced. This has brought great pressure on the overall profitability of State Grid Corporation of China. Influence. In the next step, State Grid Corporation of China’s investment in these traditional, especially transmission and distribution network infrastructure will definitely be further reduced in the next two years. It will not be like the large number of infrastructure projects in previous years. Investment must be reduced, and the next step is to improve the equipment utilization of the power grid.

　　Finally, let’s introduce the overall situation of the company. Our company is engaged in the research and development of the entire industry chain in the field of energy storage, including energy storage PCX, ferrophosphate battery cells, including system integration and PCS (1:00:51) production, which are located in different bases. Suzhou has a subsidiary in the Kunshan Industrial Park that specializes in equipment for medium and low-voltage distribution networks, including switch cabinet equipment. Chengdu Xinneng mainly does ××, and the headquarters does the research and development of software platforms. There is an industrial base in the suburbs of Shenzhen for industrial integration, and the Jiangxi company is engaged in battery production.

　　This picture shows the figures at the end of last year. Several different types of energy storage have been completed in China, including grid-side, user-side and thermal power plant frequency regulation and new energy supporting equipment. Last year, it reached 450 MWh. This Yes (1:01:53), solving the problem of power supply in areas without electricity through photovoltaic quotas.

　　By May and June of this year, and by the end of last month, the latest statistics show that a large number of thermal power plant frequency regulation projects and grid-side projects have reached 700 MWh. This does not include the winning bids, but includes the amount of supply and delivery. caliber.

　　This is the virtual power plant project in Yumen that our company did in 2015. At that time, one of the first key demonstration projects of the Energy Internet of the National Energy Administration was built with 10 megawatts of energy storage, 15 megawatts of photovoltaics, and 10 megawatts of wind power. It mainly played a regulating role in the virtual power plant and connected with the local area. An equivalent virtual power plant that integrates new energy power generation.

　　It mainly includes power prediction, real-time energy management and the management, controllability and dispatchability of different energy sources to achieve the effect of a virtual power plant.

　　These are the two energy storage stations our company built last year, one is an energy storage station in Jiangsu, and the other is a grid-side energy storage station in Yannong, Changsha. They were connected to the grid and put into operation after the Spring Festival last year.

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