Recently, the whole series of rail transit energy management system products independently developed by CRRC Yongji, including medium voltage energy feeder device, capacitor energy storage device and ground resistance dissipation device, have passed the third-party inspection of the China Academy of Railway Sciences Corporation Limited and are qualified for market application.
As a result, CRRC Yongji Electric Co., Ltd. has been further promoted from the largest supplier of ground power equipment in China to a supplier that can provide users with comprehensive traction energy management system solutions.
The current urban rail transit vehicle adopts electric air joint brake and electric braking is preferred. According to the current domestic traffic density, regeneration rate can reach 70-80%, the rest is mainly train braking resistor in the form of heat consume, not only waste energy, but also increase the burden of the station air-conditioning and ventilation equipment, increase the construction cost and operation cost. If we can avoid heat within the tunnel release or will this part of energy recycling, it can reduce the energy consumption of air conditioning and ventilation and even recover 20-30% of braking energy, which will bring huge economic benefits.
Therefore, CRRC Yongji based on customer's needs and pain points. On the basis of the ground power supply for many years, with the full understanding of traction drive system and mature control technology, developed a series product traction energy management system, the system of medium voltage can feed device, capacitor energy storage device and ground resistance dissipation devices, and meet different user requirements.
Within the system, medium voltage energy feed device adopts the scheme of inverting feedback to medium voltage power grid, and inverts the recycled electric energy to medium voltage ring network to supply other metro loads for secondary use, thus reducing the consumption of electric energy. The energy storage components of capacitor energy storage device adopt green and safe lithium ion capacitor, which has the advantages of high energy volume density, long cycle life, simple connection with power grid and convenient construction, etc. It is especially suitable for the transformation of existing lines, with better performance matching and higher cost performance. The ground resistance dissipation device has obvious price advantages, and can replace the vehicular braking resistance, discharge the heat centrally outside the tunnel, reduce the energy consumption of air conditioning and ventilation, and realize the lightweight of the vehicle, reduce the total amount of braking energy, thus reducing the braking energy loss. The above devices are equipped with real-time data monitoring, automatic early warning and other functions to facilitate friendly docking with the SCADA system.