What is an energy storage system
In the analysis of the energy storage process, the part of the object or space that is delineated in order to determine the research object is called the energy storage system. It includes energy and matter input and output, energy conversion and storage equipment.
Why store energy?
Energy storage technology has great value. After new energy is integrated into the power grid, energy storage can achieve real-time balance in power, improve the capacity factor of the system, improve energy consumption capacity, and cut peaks and fill valleys.
New energy + energy storage
The application form of energy storage system combined with intermittent renewable energy such as photovoltaic and wind power has the effect of smoothing the fluctuation of renewable energy power generation.
For example, in the field of distributed photovoltaics, on the one hand, the cost of distributed photovoltaics is lower than the retail electricity price of the grid, and the price difference is enough to support the installation of energy storage; By interacting with the power grid, shaving peaks and filling valleys can maximize revenue.
Therefore, the application form of energy storage system combined with renewable energy represented by photovoltaic and wind power has become one of the important directions in the development of the global energy storage field.
The role of energy storage systems
Because the energy needed by people has strong time and space, in order to use energy reasonably and improve the utilization rate of energy, it is necessary to use a device to collect and store the excess energy that is temporarily unused for a period of time in some way. It can be extracted and used at the peak of use, or transported to places where energy is scarce and used again. This method is energy storage. The basic task of energy storage systems is to overcome temporal or local differences between energy supply and demand.
Classification of energy storage systems
Mechanical energy storage
- Pumped storage
compressed air energy storage
- Flywheel energy storage
Electrical energy storage
- Supercapacitor energy storage
- Superconducting Energy Storage (SMES)
Chemical energy storage
- Using hydrogen or synthetic natural gas as the carrier of secondary energy, using excess electricity to produce hydrogen.
Thermal energy storage
- The thermal energy is stored in the medium of the insulated container and converted back to electrical energy when needed, and can also be used directly without being converted back to electrical energy.
Electrochemical energy storage
- Podium sulfur battery
- Flow battery
- Lead-acid batteries
- Lithium-ion battery: It is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Energy storage battery OSM battery The company currently provides 5KWH and 10KWH lithium-ion batteries. Currently, it has obtained the CE certification of the European Union.
WallEco 51.2V 200Ah 10kWh
WallEco 51.2V100Ah 5kWh
Requirements for a good energy storage system
①The energy stored per unit volume (volume heat storage density) is high, that is, the system stores as much energy as possible.
②Have good load regulation performance. When the energy storage system is in use, it is necessary to adjust the amount of energy released according to the requirements of the energy user. The quality of the load regulation performance determines the quality of the system performance.
③ Energy storage efficiency should be high. Energy storage is inseparable from energy transfer and conversion technology, so the energy storage system does not require excessive driving force to receive and release energy at the maximum rate. At the same time, the leakage, evaporation, friction and other losses during the energy storage process are reduced as much as possible, and a high energy storage efficiency is maintained.
④The system has low cost and reliable long-term operation.
Application scenarios of energy storage systems
1.Power generation side:Improve the dispatchability of new energy and avoid abandoning light and wind. Realize the smooth output power of new energy, reduce the impact on the power grid, and improve the utilization rate of output power lines.
Application: Photovoltaic power generation, wind power generation and other new energy sources.
2.Transmission side:Provide frequency regulation and peak regulation for the power grid. Actively realize active power, power out, and improve power supply quality.
Applications: Power plants, new energy power stations.
3.Power distribution side:Improve the photovoltaic self-consumption rate and load self-balancing rate, and reduce the energy exchange between the system and the power grid.
Application: Microgrid, self-generated distributed power generation.