The application of active power filters in the power quality management of the subway industry

Due to the complex structure and diverse loads of the modern subway power supply system, as well as the large number of power switching devices and electronic equipment it employs, a significant amount of harmonic current is generated. Traditional passive filtering devices, due to their inherent limitations, have become difficult to adapt to such a complex situation. Now, they have been gradually replaced by active power filter solutions for power quality.

The economic benefits of using active power filters to manage harmonics in the power distribution system:

(1) Eliminating harmonics in the power distribution lines can reduce the effective value of the current flowing through the lines, thereby significantly reducing the losses of the lines and transformers, and saving electricity; at the same time, it can lower the temperature rise of the distribution cables and transformers, improve the load capacity of transformers and cables, and extend the service life of transformers and cables.
(2) Enhancing the stability and service life of equipment. Modern lighting equipment, communication equipment, weak current equipment, etc. are all prone to be interfered by harmonics and affect their normal operation or reduce their service life.
(3) Reducing the false actions or refusal actions of control equipment and relay protection devices, improving the safety and reliability of power supply.
(4) Enhancing the load capacity of transformers and distribution cables, which is equivalent to expanding the system once, reducing the investment in system expansion.
(5) Active filters can also compensate for the reactive power deficiency in the system, ensuring the power factor of the system.

The advantages of JInneng electrical products in the subway industry:
(1) Metro stations are mostly located in the bustling areas of the city, where every inch of space is precious. Hichuo's electrical product series all adopt a modular design concept, with small size and light weight, fully meeting the demand for space savings. APF and SVG can not only be installed on the wall, but also installed in a cabinet, effectively utilizing the space.

(2) Track trains, air conditioners, and power distribution equipment all generate a significant amount of noise during operation, which has a considerable impact on the acoustic environment of the subway. Therefore, reducing the noise generated during equipment operation is also a matter that requires careful attention. Hixuo Electrical's APF and SVG devices have very low noise levels during operation, which can to some extent reduce the impact of active filtering equipment on the acoustic environment of subway stations.

(3) As a public place with a huge volume of people, the subway station has a main load consisting of lighting sources, escalators, fans, air conditioners, etc. The main harmonic source is the frequency converter. The safe and stable operation of the equipment inside the station is very important. A large number of examples show that the products of Xituo Electric can effectively manage the harmonics and reactive power of such loads, with obvious effects, stability and reliability. The products of Xituo Electric can fully meet the requirements of the subway station for the safe and stable operation and high reliability of the equipment inside.

(5) The active filtering and reactive power compensation capacities required by each station are adjusted in real time. The capacity modules of each single module of APF and SVG can be freely connected in parallel for expansion, which can meet the various capacity requirements of different stations.

(6) The Jinneng electrical series products adopt a modular design, which significantly enhances the convenience of transportation. During the operation of the products, if a fault occurs, it is very easy to transport the new module to the corresponding position. Replacing a single module only takes ten minutes. The modular design of Jinneng electrical products makes equipment installation more convenient and maintenance simpler.

The Jinneng Electrical Active Power Filter has fast response speed, excellent compensation effect, low loss and long service life. It is one of the few safe and efficient power quality solutions available at present. By using the Hichuo Electrical Active Filter system to manage harmonic pollution, not only can the safety and reliability of equipment be guaranteed, but also the line loss of the system can be reduced, electricity expenses can be saved, thus creating a clean and energy-saving electrical environment for the rail transit.