It saves 1600 kilowatt-hours a day! The energy saving of the megawatt flywheel energy storage device

In April this year, Qingdao Metro installed and put into use the first megawatt flywheel energy storage device with completely independent intellectual property rights in the rail transit industry in China in Wanniquan Road station of Qingdao Metro Line 3. After continuous upgrading and optimization tests, the daily power saving of the equipment has reached 1600 KWH, exceeding the expected value by 16.8%!

Qingdao Metro, focusing on the "double carbon" goal of "building a world-class green subway, saving electricity by 30% and reducing carbon by 40%", installed and put into use the first megawatt flywheel energy storage device with fully independent intellectual property rights in the rail transit industry in Wanniquan Road station of Qingdao Metro Line 3 in April this year. Flywheel energy storage belongs to physical energy storage. Magnetic levitation technology is adopted. The flywheel rotor runs in a vacuum room without wind resistance. The flywheel energy storage device is installed in the traction substation of rail transit. When the train stops at the station, the flywheel absorbs the energy and converts the electric energy into kinetic energy. The rotating speed is as high as 20000 revolutions per minute. When the train accelerates out of the station, the flywheel releases energy, converts kinetic energy into electric energy, and releases energy for the train to use, with excellent energy saving and voltage regulation effect.

As the first single megawatt flywheel energy storage device with fully independent intellectual property rights in the domestic rail transit industry, it has many advantages, such as high power density, high energy saving rate, high reliability, long life, environmental friendliness and high safety factor. During the network hanging test, the flywheel energy storage device was continuously run in with the running mode of Line 3 train, and the conversion of kinetic energy and electric energy, as well as the absorption and release of energy, all found the best meeting point consistent with the actual power supply demand law of train operation. The observation shows that the flywheel device can effectively stabilize the voltage of the power supply system through the millisecond response speed, improve the reliability of the power supply, but also reduce the impact of the network voltage is too high on the related equipment of electric bus.

It is understood that the energy generated by the braking of rail transit trains can reach about 20%-40% of the energy consumption of the traction system, and the flywheel energy storage device can make full use of this energy, which can significantly reduce the energy consumption of rail transit operation. After continuous upgrading and optimization tests, the matching degree between the flywheel energy storage device and the running mode of Line 3 train steadily increases, and the energy saving efficiency of the equipment keeps rising. The average daily electricity saving has reached 1600 KWH, 16.8% higher than expected!

In the future, Qingdao Metro will take practical actions to implement the ecological priority green development strategy, comprehensively coordinate the matching between the braking energy absorption demand after the cancellation of on-board brake resistance and the capacity setting of flywheel energy storage device, so as to achieve both driving safety and investment benefits, and promote the successful experience of the flywheel energy storage device at Wanniquan Road station to the whole line network. Its high-efficiency power saving mode and network pressure fluctuation inhibition function will effectively promote Qingdao Metro and even the whole rail transit industry to achieve green transformation and development, and help realize the national "double carbon" strategic goal.

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