Bidirectional converter
Power supply can be seen everywhere in our life. Refrigerators, televisions, air conditioners, washing machines and so on are inseparable from the power supply. A fast train depends on its head. If metro vehicles want to move, they need traction power supply. Application of traction power supply to metro vehicles
Just as gasoline is to cars. The new generation of traction power supply based on two-way converter can not only supply power to vehicles like the conventional traction power supply based on rectifier, but also generate power by using train braking. It has become a real source of power for metro vehicles and an energy-saving expert in substation.
In addition, bidirectional converter is versatile. It can provide reactive power compensation, improve the quality of power supply network, and deice the catenary / rail to ensure the safe operation of the train in extreme weather.
characteristic
#01 high safety: all kinds of protection are complete, and can withstand the short-circuit current equivalent to the rectifier unit, reaching more than 27ka / 120ms;
#02 high system efficiency: a number of black technology bonus, such as high efficiency and low leakage reactance transformer, switching frequency adaptive technology, harmonic suppression technology, etc., the system efficiency exceeds 98%, and the converter efficiency reaches 99%;
#03 high reliability: it comes from the traction converter technology platform and product platform of high-speed railway vehicles. The core module adopts the traction IGBT with the highest reliability, modular and multiple redundancy design to ensure the reliability of power supply.
advantage
Energy saving: the equipment can fully absorb the braking energy of the train, the fluctuation of DC network voltage can be reduced by more than 50%, the line loss can be reduced, and the electric energy can be saved.
Quality improvement: improve power factor and reduce harmonics; The power supply distance can be increased by 20%, the DC ripple voltage can be reduced, and the power quality can be improved.
Land saving: integration of traction and feedback, reducing the number of equipment, saving about 30 square meters of floor area / station.
Cost reduction: it can cancel on-board braking resistance, reduce SVG capacity or cancel SVG of main substation.
Unique advantages of CRRC Times Electric:
The intelligent and efficient power supply and traction system with the collaborative integration of "source load transportation maintenance" is the first in China. Starting from the multiple links of "source, load, transportation and maintenance", the power supply, signal and traction system with the collaborative integration of "supply use" is constructed.
The bidirectional converter developed by time electric has obtained many invention patents, passed the third-party type test and short-circuit type test, and passed the evaluation of scientific and technological achievements. The evaluation opinion is that the overall technology of scientific and technological achievements is at the international leading level.
On June 30, 2019, the two-way converter was officially put into operation in Ningbo Rail Transit Line 3. This is the first two-way converter operated on the main line in China. After nearly two years of on-site demonstration application and third-party test verification, the two-way converter has been mature and stable, and is ready for mass application in the market.
In July 2020, the joint commissioning test of intelligent power supply system based on bidirectional converter and energy operation control system was passed in Ningbo Rail Transit Line 4. Compared with the conventional scheme of rectifier unit and energy feedback device, this scheme can save 2.61% energy and reduce 61.5% network voltage fluctuation.