 At present, traditional power grid faces two challenges: First, its transmission mode can not meet the requirements of distributed generation. The grid was created to ensure the reliability, robustness and flexibility of transmission so that it could both provide electricity to customers and extend its range of services. As a result, the grid uses a simple and intuitive design: power plants deliver power to customers through transmission and distribution lines, substations and distribution transformers. But with the advent of distributed renewable energy sources such as solar, wind and fuel cells, new types of renewable power plants are located closer to the load than to the central generation area, directly connected to transmission and distribution lines, often with the client as the front end, The traditional one-way transmission mode from large power plants to customers can not meet the requirements of distributed generation. Second, the instability of the power grid. There are many reasons for this result, among which the main reason is the daily and seasonal peak load caused by air conditioning, heating, computer systems, industrial operations and lighting. Unpredictable generation patterns and the resulting intermittency of solar and wind power also contribute to grid instability. Bidirectional energy flow from new forms of distributed generation (including renewable energy) has caused chaos in power plant distribution transmission lines and substations, and the impact of aging transmission and distribution infrastructure has created an urgent need for a local grid energy storage system to balance this unstable grid. Emerging supercapacitor energy storage systems Traditional grids are disappearing, and demand for new ones is growing. Although the traditional grid architecture undertakes most of the functions of the grid, the evolution of the grid form is prompting the power sector to adopt the combined system of batteries and supercapacitors as auxiliary technologies to meet the needs of various types of grid. For example, In the next generation grid energy storage system assembled by Duke Energy for the distribution substation in Gaston, North Carolina, USA, Maxwell supercapacitor and battery combined energy storage system is used. The integrated system uses Maxwell56V supercapacitor modules to stabilize the solar output voltage on the distribution line in real time, which solves the problem of fluctuations in solar power generation when connected to the grid due to cloud cover or other weather factors. At the same time, the battery is responsible for the power switch of the large solar system on the distribution circuit. The Maxwell supercapacitor and battery energy storage system combines high-power, fast-response supercapacitors with high-energy density batteries to achieve low-cost grid services and maximize the value of the power system. The system also intelligently integrates advanced power electronics and control systems from Winandotropic to ensure optimal battery and supercapacitor combination. Specifically, the technical and economic benefits of using ultracapacitors in composite systems include: Solar power integration service: includes smoothing short, rapid solar intermittent fluctuations Extend the overall life of the energy storage system: Avoid peak power shocks to the battery by using ultracapacitors Reduced cost: There is no need to add cells to cope with high power/thermal stress performance over long life Reduced operating expenses: Ultracapacitors are designed for more than 1 million charge and discharge cycles, ensuring performance and long life over a wide operating temperature range Capacity assurance: By supporting battery performance, ultracapacitors slow down the decay of battery capacity over time, thus reducing the risk of low power (which can lead to financial loss) Battery and super capacitor combination system is a kind of high feasibility and good economic benefit solution, it is a combination of battery to provide power supply for a long time and super capacitor provides the advantage of instantaneous power, can meet the demand of power grid of ultra-high speed, providing nearly seamless electricity transmission and power supply for a long period of time, greatly satisfy the grid thirst for energy. |