Future energy storage system functions are more grid-friendly. Key performance indicators such as efficiency, reliability and safety of battery energy storage systems are critical to the successful commercial deployment of energy storage systems.
Big data and other technologies have fully empowered the safe and cost-effective operation of energy storage systems. With intelligent and platform development, PCS also emphasizes independent intelligence and collaborative operation.
1. Hundreds of billions of energy storage tracks
Structural change in energy supply: large-scale installation of clean energy According to the plan, China needs to promote clean energy development and energy consumption and electricity substitution. Achieve clean energy production and energy use.
The output of new energy generation has random fluctuations, and the output is intermittent. It is unpredictable due to weather, environment and other factors. Wind power output is highly random and intermittent.
Wind power output fluctuates greatly, and the fluctuation frequency is also irregular. It is greatly affected by the weather. Photovoltaic power generation is intermittent, volatile and random. The sunlight shining on photovoltaic panels is intermittent, fluctuating, and random.
In addition to the difference between day and night, it also stems from the instability of weather (such as sunshine and wind). The larger scale of grid connection brought about by the carbon neutrality policy has brought great challenges to the safe and stable operation of the power grid and the balance of power and electricity.
2. Significant flexibility to regulate resources
Energy storage technology solves bottlenecks such as fluctuation and intermittent renewable clean energy, and realizes the dynamic balance between power generation and load on the distribution side. As a new flexible regulatory resource, to store energy will play an important role in the power system with a high proportion of renewable energy.
Energy storage can integrate renewable energy sources to achieve continuous and efficient energy use. Provide technical support for the in-depth promotion of energy production transformation, and become the focus of construction with the promotion of clean energy installation.
Electrochemical energy storage technology is mature, not limited by geography, suitable for large-scale application and batch production, and has good prospects for industrial application. China's most mature power storage technology is pumped storage.
However, the site selection is greatly limited by geographical factors and the construction period is long, and its application in the power system is limited. New energy storage represented by electrochemistry has characteristics:
- Fast adjustment
- Flexible layout
- Short construction period
- Simple operation control
It has become an important means to improve the reliability of the power system. Electrochemical energy storage is widely used in power grid peak regulation and frequency regulation, covering the power plant side, grid side and home energy storage, and can perform unmanned operation.
3. Information market structure
The complete electrochemical energy storage system is mainly composed of: battery pack, battery management system (BMS), energy management system (EMS), energy storage converter (PCS) and other electrical equipment.
- Battery packs play a key role in energy storage and are the core component of this system.
- Battery management system plays a sensing role, mainly responsible for battery monitoring, evaluation, protection and balancing.
- Energy management system plays a decision-making role, mainly responsible for data collection, network monitoring and energy scheduling.
- Energy storage converter plays an executive role, the main function is to control the charging and discharging process of the energy storage battery pack, and carry out AC and DC conversion.
Deconstruction of system to store energy: "3S" and system integration account for 30% of the cost The upstream of the energy storage system includes batteries, PCS, BMS and other equipment, as well as battery raw materials and electronic components, and the downstream includes power plants, power grids, load users, etc.
From the cost point of view, batteries account for more than 50% in energy storage systems, PCS accounts for about 11%, BMS accounts for about 9%, and EMS accounts for about 5%.
At present, the market to store energy is in the early stages, the division of labor in the industrial chain is not mature, and the top 5 energy storage BMS companies in the market can be mainly divided into three roles: battery factories, PCS manufacturers and energy storage integrators. The battery threshold is higher and the pattern is clearer. PCS has a certain threshold, and leading photovoltaic converter companies such as Sungrow have formed a certain first-mover advantage.
BMS and EMS products are developing towards intelligence, digitalization and platformization. The product form has a large margin and many participants. Since the energy storage system integration link is directly oriented to user needs, most of the various participants have layouts.
4. The electricity market boosts economic returns
● Integration of wind, solar and storage
Wind and solar storage reduces wind and solar abandonment, tracks the scheduling plan, and accepts dispatch to smooth the output load. On the one hand, rapid response and precise control to meet the output plan.
On the other hand, the design of optimized operation strategy and control strategy is carried out to improve the economic benefits of the operation of the energy storage system and improve various technical indicators. Wind, solar and storage participate in electricity market transactions.
The energy storage system is linked to power generation forecasting and power trading to participate in electricity market transactions. Integrated data opening and coordination of wind-solar power stations can help power stations form more reasonable charging and discharging strategies for energy storage.
● Virtual power plants
Virtual power plants are an important branch scenario under the rise of distributed pv system and energy storage. The virtual power plant will carry out unified coordinated control of distributed generation, demand-side response and energy storage resources, and aggregate and respond to grid dispatching instructions. The core functions of virtual power plants are to regulate distributed power sources and regulate energy storage and controllable loads.
5. ConclusionDigitalization profoundly empowers energy transformation, and with more intelligent and digital energy storing systems, energy storage scenarios become more complex. The explosion of energy storage will bring new increments to energy IT. Companies have made efforts to achieve smart energy storage to improve the intelligence of product digitalization.