Powersys New Energy


  Flywheel energy storage uses the motor to drive the flywheel rotor to rotate at high speed under the condition of vacuum magnetic levitation to store energy. When the speed increases, it can be charged, and when the speed decreases, it can be discharged. High power density and long life are its technical characteristics. It can not only respond to high-power charge and discharge within 5 milliseconds, but also its charge and discharge life is up to tens of millions of times.

  The guiding opinions on accelerating the development of new energy storage issued by the national development and Reform Commission and the national energy administration proposed to improve the ability of scientific and technological innovation and speed up the large-scale test and demonstration of new energy storage technologies such as flywheel energy storage.

  Mutual conversion of electric energy and kinetic energy to achieve zero pollution

  Recently, flywheel energy storage has ushered in great benefits: a major breakthrough has been made in the application of megawatt flywheel energy storage technology in China's energy technology revolution and innovation action plan, and the technology has been successfully applied on Han Chang railway.

  Flywheel energy storage has been successfully applied in urban subway, but it is the first time in the field of electrified railway.

  In Hebei Xingu town traction substation of Handan Changsha railway, there is an electrical cabinet similar to a container, which is a megawatt flywheel energy storage device that has just been officially put into operation.

  Its operating principle is: the huge electric energy generated when the train enters the station and brakes can accelerate the rotation of the flywheel and store it in the form of kinetic energy; When the train speeds out of the station, the flywheel can release kinetic energy to the train. The mutual transformation of electric energy and mechanical energy is realized by physical methods to truly realize zero pollution.

  Chen Ying, the general director of the flywheel energy storage system project, gave a vivid example, "just like a gyro, after you apply an external force to it, the gyro will rotate at a certain speed. If you stop smoking it, it will not stop immediately. It will stop after a period of energy consumption. In fact, our flywheel is also a big top. "

  This railway traction substation alone can save 3000 kwh of electric energy every day.

  It is conservatively estimated that if this technology is applied to 20% of the electrified railway traction substations in China, more than 1 billion kwh of electric energy can be saved every year and more than one million tons of carbon emissions can be reduced.

  Multiple application routes

  In the 1960s and 1970s, the Glenn Research Center of NASA began to use the flywheel as an energy storage battery in satellites. This is the beginning of flywheel energy storage application. Because the technical principle is the conversion of kinetic energy and electric energy, it is widely used in the field of transportation.

  The flywheel energy storage system has the characteristics of millisecond power response, ten million cycle life and hundreds of charge and discharge per hour. It can well adapt to the characteristics of frequent start and braking of urban rail transit trains. It covers only 1 / 4 of the lead-acid battery and can be placed in various areas according to practical application. After long-term development, flywheel energy storage has multiple applications in addition to subway and electrified railway:

  1) Uninterruptible power supply: once the power grid has problems such as fluctuation, instantaneous disconnection and interruption, the flywheel energy storage device can play a role instantly to provide emergency power supply guarantee. At present, the battery usually has requirements for working temperature, working humidity, input voltage, discharge depth and other conditions. At the same time, the battery is not allowed to be closed and opened frequently. The flywheel has the advantages of large energy storage, high energy storage density, fast charging and unlimited charging and discharging times, so it has a good application prospect in the field of uninterruptible power supply system.

  2) Electric vehicle battery: flywheel battery is widely valued by the automotive industry because of its clean, efficient, fast charging and discharging and no environmental pollution. At present, it is still in the research and development stage.

  3) Uninterrupted power supply of wind power generation system: the United States has introduced the energy storage flywheel into the wind power generation system to realize the whole process peak shaving. The power generation of the flywheel unit is 300kW, and the energy storage of the high-capacity energy storage flywheel is 277kw per hour.

  In the future, flywheel energy storage technology can also be widely used in aerospace, medical and other fields, with broad market prospects. In addition, the flywheel energy storage device is made of alloy steel, which can be recycled after scrapping, meeting the requirements of green environmental protection.