Charging pile, "photovoltaic + energy storage + charging"

31-01-2020

As the name suggests, “photovoltaic + energy storage + charging”, China has clearly promoted the promotion of new energy vehicles. The market for electric vehicle charging piles has expanded, but the operation of charging piles alone is not ideal for corporate income. The storage and charging system can cut the peaks and fill the valley and save a part of the electricity price. It is also a reflection of the sustainable development of energy. Nowadays, the optical storage and charging project has gradually become the target of many domestic enterprises.

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Recently, a number of “light storage and charging” projects have been successfully put into operation, and Fujian, Shaanxi, Hubei and other provinces and cities have successively achieved zero breakthroughs in the “light storage and charging” project.


As the name suggests, “photovoltaic + energy storage + charging”, in the context of China’s clear promotion of new energy vehicles, the market for electric vehicle charging piles has expanded, but the operation of charging piles alone is not ideal for business returns. The optical storage system can cut the peaks and fill the valley, save a part of the electricity price, and is also a reflection of the sustainable development of energy. Nowadays, the optical storage and charging project has gradually become the favorite target of many domestic enterprises.


The optical storage and charging integrated power station can solve the problem of insufficient power distribution capacity of the new energy vehicle charging station. It uses the night low valley electricity price for energy storage, and supplies power to the charging station through energy storage and utility power during the peak charging period to meet the peak power consumption. Demand has not only achieved peak cutting and valley filling, but also saved power distribution capacity, increased consumption of new energy, and made up for the lack of solar power discontinuity. It is a sustainable energy utilization method.


According to statistics, among the 31 provinces and cities that have adjusted the general industrial and commercial electricity prices nationwide, a total of 18 provinces and municipalities have issued peak-to-valley electricity price lists to encourage users to use electricity in a time-sharing manner by reducing electricity prices during the night low valley period and increasing the peak daytime electricity prices. Recently, Shandong Province has implemented an electric energy substitution incentive policy. The electric bus vehicle centralized charging and replacing facilities use a kilowatt hour of electricity consumption for each kilowatt hour, and the electricity is used to deduct the peak (priority) peace. Segment electricity, reduce the cost of electricity for electric buses. The Guizhou Provincial Development and Reform Commission also said that it will explore the use of price signals to guide the power to cut peaks and fill valleys, and to test the peak and valley time-sharing electricity prices for electric vehicles and electric storage.


The significance of energy storage in optical storage is that charging facilities companies can use energy storage devices to store electrical energy in valleys with lower electricity prices, and use stored energy during peak hours to avoid direct use of high-priced grid power. This can reduce the operating costs of enterprises and realize the arbitrage of peak and valley electricity prices.

According to the data, the peak-to-valley spread of the provinces in the country is distributed at 0.4~0.9 yuan/kWh, while for the two provinces in Jiangsu and Guangdong, the peak-to-valley spread is higher than 0.8 yuan/kWh, which is the user side. The use of energy storage to arbitrage peak and valley spreads provides considerable space.


The “light storage and charging” integrated charging station integrates multiple technologies such as photovoltaic power generation, energy storage and charging piles. It can not only supply green electric energy for electric vehicles, but also realize auxiliary service functions such as power peak clipping and valley filling, which can effectively improve system operation. effectiveness. The energy storage system stores electric energy when the electricity is low at night, and is released to the charging pile during the peak of the daytime power consumption. On the one hand, the impact of the large current on the regional power grid is relieved on the one hand, and the charging station is brought to the charging station through the difference between the peak and the valley. A considerable amount of income.


For traditional charging station construction, grid access and land resources are two major problems. The “light storage and charging” integrated solution achieves a basic balance between local energy production and energy consumption through power storage and optimized configuration. It can flexibly interact with the public power grid and operate relatively independently according to needs, alleviating the impact of charging pile power on the power grid. In terms of energy consumption, using an energy storage system to charge the power battery can improve energy conversion efficiency.


Not only that, the “light storage and charging” integrated charging station is a new mode for the exploration of micro-grid. The use of photovoltaic power generation clean energy, combined with energy storage technology, and the use of power batteries in ladders, is advanced in many aspects. The energy storage system of many "light storage and charging" integrated charging stations adopts the decommissioned batteries of electric vehicles, turning waste into treasure, and realizing the utilization of power batteries.


At present, China's "light storage and charging" integrated charging station is concentrated in Jiangsu, Shaanxi, Zhejiang, Fujian, Guangdong and other places, and most of these provinces have implemented peak and valley electricity prices.


As we all know, China has become the world's largest electric vehicle market, but China's charging infrastructure construction is seriously inadequate. This problem has also become a major bottleneck for the rapid development of electric vehicles and the rapid development of charging infrastructure.


Such a huge charging pile gap, if built into a light storage charging station, will greatly improve the "electric vehicle long-distance travel", inter-city traffic "mileage anxiety" problem, while saving the operating costs of charging pile enterprises, new energy The consumption has provided more favorable conditions and will also provide important demonstrations for the sustainable development of energy.


Faced with such a huge market, there are more and more enterprises that are keenly aware of the big cake of the optical storage market. Most of them are mainly industrial enterprises such as electric power and charging infrastructure. The favor of energy companies.


However, the high cost of energy storage is a difficult problem for the integrated development of “light storage and charging”. At present, some PV+ electric vehicle battery charging projects are implemented, and the energy storage unit is postponed. The fundamental reason is that the energy storage cost is too high. Whether it is the new lithium battery energy storage or the step-by-step utilization of the power battery, the added cost is unbearable for enterprises.


In addition, the photovoltaic installed capacity can only meet the charging demand of electric vehicles only when it reaches a certain scale, and large-scale photovoltaic construction requires a large area. Therefore, the “light storage and charging” integrated charging station is largely restricted by the site, and most of them have localized construction in the public areas of the city with distributed photovoltaic and energy storage system layout conditions, such as commercial parks, industrial parks, commercial residential buildings, etc.


When the energy storage cost is too high, the corresponding industrial incentive policy is very important. At present, in the mainstream market for overseas energy storage applications, although the electricity price is relatively high, there is a subsidy policy for the energy storage industry, which has boosted the development of the local energy storage industry. After the implementation of China's energy storage policy, it is believed that the optical storage system will also usher in a larger market.


At present, the “light storage and charging” integrated charging station is more profitable by using the peak-to-valley electricity price difference, and the “light storage and charging” integration scheme can better realize the investment income in the area where the peak-to-valley electricity price difference is relatively large. Photovoltaic power generation is self-sufficient, and surplus power storage combines the energy-storage peak-valley electricity price arbitrage. With energy storage systems, it will inevitably increase the cost of the power station and extend the investment return period.


Therefore, despite the continuous implementation of the project, the number of “light storage and charging” integrated charging stations is still small. The number of charging piles in the “light storage and charging” integrated charging station accounts for a very small proportion of the total number of charging piles in the country. At present, there are many demonstration application stations, and large-scale promotion has not yet been carried out.


Internationally, the “light storage” model has been operated in many countries and regions. Residents use their own roofs to build photovoltaic arrays. The stored electricity is used for electric vehicle charging or household electricity, and the remaining energy can be sold to the grid.


In China, with the maturity of the photovoltaic industry, the boost of the new energy automobile industry, and the advancement of energy storage technology, the “light storage and charging” integrated power station has also landed smoothly. At present, many domestic companies are actively promoting the construction of “light storage and charging” integrated charging stations. It is the starting point for many enterprises to build a 'light storage and charging' integrated charging station to build a high-power charging facility in social public places, to solve the pain points of new energy vehicle charging infrastructure, and to match the scarcity peaking resources of power grid dispatching.


The cost of photovoltaic + energy storage + charging micro-grid system is gradually decreasing. The "light storage and charging" mode is flexible and friendly, and has broad application prospects in the long run.


Therefore, despite the continuous implementation of the project, the number of “light storage and charging” integrated charging stations is still small. The number of charging piles in the “light storage and charging” integrated charging station accounts for a very small proportion of the total number of charging piles in the country. At present, there are many demonstration application stations, and large-scale promotion has not yet been carried out.


At the same time, energy storage services in charging facilities, safety issues can not be ignored, to prevent the occurrence of heat, short circuit and other phenomena in the process of charging and discharging.


The popularity of new energy vehicles, users' demand for fast charging, the city's electricity load will far exceed the existing power supply capacity, and urban expansion has become a reality. In the future, centralized charging of electric vehicles is likely to lead to urban power shortage. Distributed energy storage can not only solve the problem of urban expansion, but also provide backup power for commercial complexes and intelligent buildings to avoid temporary power outages during peak hours.


The optical storage and replacement power station has a far-reaching impact on the development of new energy vehicles. It is of great significance. Photovoltaic self-use, green economy, energy storage can alleviate the expansion of power grid investment, and optical storage charging stations will become the mainstream of charging infrastructure development.


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