Electric vehicle storage model, important challenge, and promotion policy recommendations

Electric vehicle storage model, important challenge, and promotion policy recommendations

As the number of electric vehicles continue to expand, electric vehicle storage is increasingly received. Electric vehicles can also be considered as distributed energy storage facilities, can be combined with distributed energy, renewable energy, etc., can also be applied to power demand response, and perform real-time charge and discharge changes according to system flexibility adjustment requirements.

. The concept of electric energy storage energy is continuously increased with renewable energy power generation, and the development of energy storage technology will be the fundamental way to make up for the shortage of flexibility in power system. However, my country has stored the installed capacity of 1.

5%, plus Domestic natural gas power generation, tradition-to-peak resources such as reservoir hydropower, limited pumping energy storage resources can also meet the huge demand for future energy cleaning transformation. Although electrochemical energy storage technology (such as lithium ion battery, liquid flow battery, etc.) has been developed in recent years, but its installed scale only is only 1% of the number of all energy storage, is not sufficient to fill energy in a short period of time.

Supply gap. Electric cars is a strategic emerging industry that realizes my country’s transportation energy transition and automotive industries. my country has launched the key technology R & D in electric vehicles and implements commercial support policies, which has strongly promoted the rapid development of my country’s electric vehicle industry.

. In 2017, the national electric vehicle sales reached 777,000, and the accumulated amount of more than 1.8 million vehicles were promoted, accounting for more than half of the global electric motor market.

. Current German, Law, English, Mori, Lot, Pin, etc. have proposed fuel vehicles to withdraw from the target.

my country has also developed the development goals of new energy vehicles and funds in 2020, with a development goal of 200,000 and 5 million, and 2018 The “Passenger Corporation’s average fuel consumption and new energy vehicle points parallel management method” means that traffic electricity has become an irreversible trend.. As the number of electric vehicles continue to expand, electric vehicle storage is increasingly received.

Electric vehicles can also be considered as distributed energy storage facilities, can be combined with distributed energy, renewable energy, etc., can also be applied to power demand response, and perform real-time charge and discharge changes according to system flexibility adjustment requirements..

The regulatory scale after the popularity of electric vehicles is very considerable, combined with advanced power electronic communication control technology, reasonable charge and discharge facility layout and guiding electricity price policy, electric vehicles have huge application potential in improving the reliability and flexibility of electricity system operation. Foreign research has begun earlier, the University of Delaware, the University of Delaware, has compared the development of the US electricity system and transportation sector, and found that there are quantity vehicles in the JDR. For electric vehicles, electric vehicles charge / discharge total power exceed the total capacity of the national power generation installed.

Research further found that the instantaneous power regulatory capability is realized due to the change of road working conditions due to the beginning of the electric vehicle design, so electric vehicles also fully meet the response time and climbing rate in power system auxiliary services.. In addition, electric vehicles V2G hardware investment cost is relatively limited.

The most important factor in restricting its promotion is the high battery cycle life.. Kempton then analyzes pure electric vehicles, plug-in hybrid vehicles, and fuel power battery vehicles in batch power generation, spike-load power generation, spare capacity, and system fs four-class power market services.

. The study concluded that different types of electric vehicles (pure electric vehicles, plug-in hybrid vehicles, fuel power batteries) adapted to different kinds of auxiliary services, and although there is different economics, there is no technical obstacle that cannot be overcome..

In terms of technical demonstration, the Danish government launched a three-year Edison electric vehicle smart grid project in 2009, which is designed to explore the application potential of electric vehicles for power demand side response.. The project is completed by electric vehicle technology group, dynamic lithium battery simulation group, technical economic evaluation group, distributed energy grid technology integration group, fast charging facility group, communication system group, system function detection group, 7 working groups, to evaluate Technology feasibility of V2G power system composed of renewable energy power generation and electric vehicle.

The project is one of the world’s largest motor vehicle energy storage empirical research projects.. In terms of industrialization, my country’s electric vehicles and charging pile companies have already taken the forefront.

. BYD E6 and other models have achieved 3.3 kWh-car exterior discharge function, the first to have distributed energy storage power stations and mobile charging vehicle capabilities.

Special electric development CMS active flexible smart charging system is based on the basic function of the charging pile, the control, protection, display, and metrics are integrated into the box substation, and the number of electric vehicles should be charged by the internal grid load through the detection area. Status and user charging time requirements, intelligent allocation charge power, charging the battery with optimized flexible current output, laid a technical foundation for intelligent charging and vehicle storage. The electric vehicle energy storage mode and the important challenge of electric vehicles can realize the vehicle energy through different modes.

This paper divides the car electricity storage into four categories, the V2G, battery replacement, and retired battery energy storage, and the scale potential. Differences in cost, infrastructure, etc.: 1, orderly charging.

Although electric vehicles cannot be discharged directly to the grid or load under an orderly charging, the “virtual energy storage” use can be achieved by changing the charging time (electricity demand response).. The energy storage power of electric vehicle ordered charging depends on the charge and discharge power of the vehicle, its energy storage capacity depends on vehicle energy efficiency and travel strength.

. 2, electricity interconnection (V2G). The current electric vehicle power lithium battery capacity is generally limited, battery life is to meet the road of travel, vehicle ginseng and V2G will accelerate battery aging, bringing high cost to users.

However, with the increase of battery capacity and the lifetime of circulating life, the battery life will gradually exceed daily traffic travel needs, and the value of V2G will appear quickly.. 3, battery replacement.

The battery is replaced with the fast supplement of electric vehicle power.. Since the vehicle and the battery have been separated, the battery replacement mode releases the energy storage potential of the vehicle battery, and the battery unloaded from the vehicle can be charged and discharge according to the peak demand of the power system.

At this time, the power lithium battery reservoir can be similar to fixed. Battery energy storage power station. With regard to battery replacement, a longer wait time is allowed between each two battery replacement, so that the unloading battery can take into account the power grid adjustment requirements and battery life to charge and discharge, and maximize the value of battery storage, as much as possible Extend battery life.

4, retired battery. With the end of the car power lithium battery life, the retired battery is expected to be indirectly consigned and grid energy through the way of the ladder..

In general, the battery capacity is reduced to 80% or less of the original capacity, it cannot meet the requirements of the vehicle power lithium battery. As the electric vehicle promotion scale is expanding, the energy storage potential of the retired battery cannot be ignored..

Based on the above four types of vehicle power storage methods, if the country has promoted 100 million electric vehicles in 2030, electric vehicles can reach 5000GWH, far higher than my country’s pumping energy storage resources, completely capable and large scale Renewable energy to form supply and demand, accelerate my country’s energy structure transformation. Although the electric storage capacity has a scale potential advantage, its commercial promotion has many obstacles. In addition to the cost of lithium battery, it also has a profound impact on existing power systems.

. Take V2G as an example, first, in terms of economic, the cost of electric energy storage and the high level of power lithium battery circulation. At present, the battery life of the power lithium battery capacity before attenuation is approximately 150,000 kilometers of accumulative life, which can only meet the travel needs of general private electric passenger vehicles users.

. With the improvement of power capacity and cycle life, its accumulated battery capacity will gradually exceed the travel needs of vehicle users, and then there will be economic performance of V2G power system services..

Therefore, V2G has certain economic constraints in the near future, but the continuous improvement of battery technology will be strongly promoted.. Second, V2G will also change the existing power market structure, which not only has added a new type of decentralized power supply, but also changed the relationship between grid companies and power generation individuals, and has the direct and charging of grid companies.

Complexity Electric car user. From the perspective of market transactions, in the traditional market, electricity is transmitted directly to the grid company on the power generation side, and then transferred to the load side, so the capital stream is also unidirectional transmission; and in the V2G market, electricity and electricity Bidirectional flow between electric vehicles and grids. Due to frequent discharge acceleration battery aging, the grid company should affect the charge and discharge behavior of electric vehicle users through the development of the counter-purchase price.

. Furthermore, from the perspective of the operation mode, only the large number of electric vehicles simultaneously and the system service, the V2G resource can supply and similar reliability services in large units, so V2G depends on the popularity of electric vehicles, the establishment of smart grids, business model Mature. Promotion Car Electricity Policy Suggestions Develop Reflection of the Charging and Discount Price Market Mechanism and Charge and Precipitation Prices of System Value is the decisive factor affecting the energy efficiency of the vehicle.

. Electric cars have huge charge and discharge and discharge, its value is to be reflected through reasonable market and price mechanisms, thus promoting the friendly connection of electric vehicles and power systems..

Accelerating the charge and discharge operation platform and standard system construction Currently, the monitoring system of the construction of charging facilities is unexpected, even if it supports ordered charging, the system is also present on the connection of the grid operating system. question. With the size of electric vehicles, electric vehicles will eventually be used as distributed mobile energy storage facilities, thereby providing higher requirements for ordered charge discharge.

. Implementing an orderly charge and discharge of electric vehicles depends on vehicles, charging facilities and grid companies, and therefore, the research on ordered charging and discharge technology should fully integrate all stakeholders..

Regarding the grid company, the charging facility should be treated as a power infrastructure, and the charging network will be used as a distribution network organic component. Comprehensively consider the planning, design, construction, operation, and accelerating the unified charging service operation platform and Charge and discharge standard system construction, promote electric vehicle charging facilities and coordinated development. Carry out new energy power generation and electric vehicle collaborative project demonstrations on the technical demonstration, in the Beijing-Tianjin-Hebei area, Zhangjiakou low-carbon Olympics, high proportion of renewable energy demonstration city, energy Internet demonstration area, national smart city pilot area, electric car Centralize key cities and regions such as application cities, organize the implementation of car electricity storage technology demonstration, and promote the accumulation of policies and operational modes related experience in the future.

. Accelerate retirement battery storage and use of raw material circulation using lithium, cobalt, etc. Resources competition and melons will be more intense.

Retired battery energy storage and battery raw material circulation utilization can improve the insufficient supply of upstream raw materials while improving battery life cycle value. However, the current decommissioning battery energy storage and material recycling is still facing many challenges. First, due to the various types of power lithium battery packages in different models, it is quite complicated to different battery types.

. Second, evaluation and system integration of the decommissioning battery health is still available in technical obstacles..

How to effectively control the process and material cost of disassembly, test, group, group, battery management, etc.

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