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Filter difference
Sep 26, 2017



Filter difference


Passive filter, also known as LC filter, is a filter circuit composed of a combination of inductor, capacitor and resistor. It can filter out one or more harmonics. The most common passive filter structure is the inductor. In series with the capacitor, it can form a low impedance bypass for the main subharmonics; single tuned filters, double tuned filters, and high pass filters are all passive filters. The passive filter is composed of passive components such as LC. It is designed to be very low impedance at a certain frequency, and the corresponding frequency harmonic current is shunted. The behavior mode is to provide a passive harmonic current bypass channel.


Due to the advantages of passive filtering with large capacity and low price, the filtering of the steel industry adopts passive filtering. At present, the domestic filtering market mainly focuses on passive filtering. Internationally represented by ABB, Schneider and Siemens, the country is represented by Satons, Wenzhou Tsinghua Electronics, Shanda Huatian, Harbin Institute of Technology, Xi'an Saibo and Greenbojie. The development situation is reflected quickly, harmonic control is thorough, and comprehensive control is the main.


The active filter is a new type of power electronic device for dynamically suppressing harmonics and compensating for reactive power. It can compensate for harmonics with varying magnitude and frequency as well as varying reactive power. It is called active, as the name implies, the device needs to provide power (to compensate the harmonics of the main circuit), and its application can overcome the shortcomings of traditional harmonic suppression and reactive compensation methods such as LC passive filters, and realize dynamics. Tracking compensation, and can complement both harmonics and reactive power.


Active filters can be widely used in distribution networks of industrial, commercial and institutional groups, such as: power systems, electrolytic plating companies, water treatment equipment, petrochemical enterprises, large shopping malls and office buildings, precision electronics companies, airports/ports. Power supply systems, medical institutions, etc. Depending on the application object, the application of the active power filter will play a role in ensuring power supply reliability, reducing interference, improving product quality, increasing equipment life and reducing equipment damage.


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