China mentioned that in the longer term, it will further promote the construction of a new power system with new energy as the main body. Adhering to the overall development and safety is the key to the high-quality development of the electric power industry in the new era.
1. The development of integration of optical storage and charging
Since China put forward the goal of carbon peak and carbon neutrality, large-scale development and utilization of renewable energy, improvement of energy efficiency and deep emission reduction have become the basic direction of the development of the energy industry.
It can be said that achieving carbon neutrality and giving priority to the development of non-fossil energy has become part of the top-level design of China's energy development. From the point of view of energy supply, cleaning the energy structure will be the main path to carbon peaks and carbon neutrality.
Renewable energy will be the mainstay of China's clean energy transition. Integrated development of renewable energy and photovoltaic, power storage and charging, mainly wind power and photovoltaic, is undoubtedly the highest priority, with unlimited prospects.
Driven by China's long-term policy guidance and market support, after more than ten years of development, photovoltaic has become an emerging industry that can participate in international competition in the energy industry and is expected to achieve strategic rejuvenation. At present, the top 10 photovoltaic battery companies in the world are built in terms of manufacturing scale, industrialization technology level, application market expansion, and industrial system construction.
2. Photovoltaic industry system construction
According to the photovoltaic and energy storage development plans, the proportion in most provinces is not less than 10%, and only the provinces that have announced the proportion of distribution and storage have energy storage installed plans of more than 29GW.
Assuming that other provinces that have not yet been announced also adopt a 10% allocation and storage ratio, it is expected that the installed energy storage capacity will exceed 41GW during the 14th Five-Year Plan period, laying the foundation for the outbreak of the photovoltaic energy storage market.
● Energy storage installation planning
The integration of solar storage and charging usually appears with distributed pv system, and after putting forward requirements for the proportion of distributed photovoltaic installations, it will further promote the landing of photovoltaic storage and charging integration and expand the scale of solar storage and charging integration.
3. Thinking on the integration of solar storage and charging
From the actual situation of the implementation of optical storage and charging integration projects in the past, photovoltaic storage and charging integration generally appeared with charging stations. On the one hand, integrated optical storage and charging stations will absorb power from the grid. On the other hand, due to the limitation of the installation area, the installation time of energy storage is usually 2-4 hours.
From the perspective of energy storage development planning, it should absorb the experience of integrating solar storage and charging, and the installation time in most provinces is set at 2 hours.
● Future charging pile mode
At present, China has become the world's largest electric vehicle market, compared to the rapid development of electric vehicles. The slow pace of charging infrastructure construction has led to a huge gap in charging piles. The rapid development of new power generation and electric vehicles provides a good opportunity for the integrated development of photovoltaics, energy storage and charging.
In the case of unbalanced development of electric vehicles and charging piles, the optical storage and charging system is an ideal solution to solve the above problems, and the integrated optical storage and charging station is an innovative attempt at the construction of new energy vehicle charging stations.
4. Photovoltaic and energy storage construction
The integrated solar storage and charging station can use the energy storage system to store energy at night, and supply power to the charging station through the energy storage station and the grid during the peak charging period. It not only achieves peak shaving and valley filling, but also saves the cost of increasing distribution capacity, and can effectively solve the problems of intermittent and unstable new energy generation.
Photovoltaic, energy storage and charging facilities form a microgrid, intelligently interacting with the public grid according to demand, and can realize two different modes of operation: grid-connected and off grid. Off grid solar batteries are used for energy storage in off grid mode. The use of energy storage systems can also reduce the impact on the regional grid when charging piles with high currents.
● Power grid
For new commercial areas and communities, when charging piles and charging stations are built, power distribution capacity can be replicated, but for older communities with insufficient capacity, power distribution is very difficult.
For this, energy buffering is extremely necessary. In the past, the construction of electric vehicle charging stations was mainly dominated by the power grid. In the original distribution network, 80% of the energy can be used for daily loads, and the remaining 20% will not be enough energy for charging stations.
● Integrated storage charging station
The integrated solution of solar storage and charging will solve the problem of distribution networks in limited land resources, and achieve the basic balance between local energy production and energy load through energy storage and optimal allocation.
It can interact flexibly with the public power grid as needed and operate relatively independently, using new energy as much as possible, which alleviates the impact of charging pile electricity on the power grid. In terms of energy consumption, the energy storage battery is directly used to charge the power battery, which improves the efficiency of energy conversion.
5. ConclusionOverall, optical storage and charging are still in the early stages of commercialization, and there are many problems. There are technical barriers to battery testing, and the payback period is also long. On the other hand, with the continuous exploration of pilot projects, photovoltaic storage and charging have also shown the trend of multi-functional complexes.