The average daily power saving is 1600 degrees! Energy saving of megawatt flywheel energy storage device of Qingdao Metro exceeded expectations
QingdaoNewsNet
Source：Peninsula Metropolis Daily 2022-11-19 13:29:25
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 at Wannianquan Road Station of Qingdao Metro Line 3. Through continuous upgrading and optimization tests, the daily average power saving of the equipment has reached 1600 kWh, 16.8% higher than the expected value。
Focusing on the "double carbon" goal of "building a world-class green subway, achieving 30% power saving and 40% carbon reduction", Qingdao Metro installed and put into use the first megawatt flywheel energy storage device with fully independent intellectual property rights in the rail transit industry at Wannianquan Road Station of Qingdao Metro Line 3 in April this year. Flywheel energy storage belongs to physical energy storage. The magnetic suspension technology is adopted, and the flywheel rotor operates in a vacuum chamber without wind resistance. The flywheel energy storage device is installed in the rail transit traction substation. When the train enters the station for braking, the flywheel absorbs energy and converts electric energy into kinetic energy, with the speed up to 20000 revolutions per minute; When the train accelerates out of the station, the flywheel releases energy, which converts kinetic energy into electric energy and releases energy for use by the train. It has excellent energy-saving and voltage stabilizing effects.
As the first single megawatt flywheel energy storage device with completely 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, high safety factor, etc. During the grid connection test, the flywheel energy storage device kept running in with the train operation mode of Line 3, and its kinetic energy and electric energy conversion, energy absorption and release all found the best fit point consistent with the actual power supply demand law of train operation. The observation shows that the flywheel device can effectively realize the voltage stabilizing effect on the power supply system through the millisecond response speed, improve the reliability of power supply, and reduce the impact of high grid voltage on the relevant equipment of electric buses.
It is understood that the energy generated by rail transit train braking can reach about 20% - 40% of the energy consumption of the traction system. The flywheel energy storage device can make full use of this energy, which can significantly reduce the energy consumption of rail transit operation. Through continuous upgrading, optimization and testing, the matching between the flywheel energy storage device and the train operation mode of Line 3 has been steadily improved, the energy saving efficiency of the equipment has been rising, and the daily average power saving has reached 1600 kWh, 16.8% higher than the expected value!
In the future, Qingdao Metro will take practical actions to implement the strategy of giving priority to ecology and green development, comprehensively coordinate the matching between the braking energy absorption demand of the subway after the cancellation of the on-board braking resistor and the capacity setting of the flywheel energy storage device, achieve the double optimization of driving safety and investment benefits, and promote the successful experience of the flywheel energy storage device at Wannian Quanlu Station throughout the network, Its high-efficient power saving mode and network voltage fluctuation suppression function will strongly promote the green transformation and development of Qingdao Metro and even the entire rail transit industry, and help to achieve the national "dual carbon" strategic goal.
