In urban rail transit projects, DC-AC variable-voltage variable-frequency transmission is generally used. The braking method of the vehicle is electric braking (regenerative braking) + mechanical braking. In operation, electric braking is the main method, and mechanical braking is the auxiliary. During the operation of the train, due to the short distance between stations, the train starts and brakes frequently, and the braking energy is considerable. According to experience, in addition to a certain proportion of the energy generated by subway regenerative braking (usually 20% to 80%, which varies according to the train operating density and interval distance) is absorbed and utilized by other adjacent trains, the remaining part will be mainly used by the trains. The recovery resistor is dissipated as heat or absorbed by the recovery device on the line. At present, the main absorption method of domestic urban rail transit is to use resistance energy consumption absorption device to deal with regenerative energy during train operation, which not only wastes energy, but also increases the burden of air conditioning and ventilation devices in the station, and increases urban rail construction costs and operating costs. If this part of the energy can be absorbed and reused, these problems will be solved. Energy storage type, that is, a supercapacitor absorption device. The working principle is that when the DC voltage rises due to the regenerative braking of the train, the equipment works in the charging state and stores the energy in the super capacitor. When the train starts to lower the DC voltage, the equipment works in the discharging state to release the energy in the super capacitor. To the DC traction network, the braking energy is better utilized and the DC voltage fluctuation is smaller. Use effect: CH1: grid side voltage waveform CH2: grid side current waveform CH3: super capacitor voltage waveform CH4: super capacitor charging and discharging current waveform. Single charge and discharge test waveform
Cyclic charge and discharge test waveform
FDBL-series products are braking energy absorption devices used in urban rail transit. They are designed with high reliability, easy operation and high performance to meet the needs of users for locomotive feedback energy absorption. Has the following characteristics:
Reduce the fluctuation range of DC voltage, improve voltage quality, and stabilize system voltage;
The inverter device adopts redundant design to meet the requirements of high system reliability;
Modular design of power circuit, easy maintenance and good interchangeability;
It can be used for energy feedback, PWM rectification, and reactive power compensation, so one machine can be used for multiple purposes;
Complete protection functions, with bias voltage, short circuit, overcurrent, overheating and other protections, high operational reliability;
When connecting with the system, there is no need to consider the phase sequence of the AC system, and the connection is convenient;
The circuit parameters of the inverter device are carefully designed, the heat generation is small, the equipment structure is compact, and the floor area is small;
Small maintenance and low operating cost;
Can be installed in parallel, easy to expand capacity;
Host computer control, easy to install and debug;
The high-voltage main circuit and the controller are connected by optical fiber, which is safe and reliable;
Complete fault monitoring circuit, fault data upload function; excellent performance and price ratio.
Note:
1. The above dimensions are for reference only, please refer to the actual
2. Due to product upgrade, the page content will be updated regularly, if you need to buy our products, please refer to the latest manual.
