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The active power filter is a new type of power harmonic control special equipment made by modern power electronics technology and digital signal processing technology based on high-speed DSP devices. It consists of two main parts: the command current operation circuit and the compensation current generation circuit. The command current operation circuit monitors the current in the line in real time, converts the analog current signal into a digital signal, and sends it to a high-speed digital signal processor (DSP) to process the signal, separate the harmonic from the fundamental wave, and pulse width modulation ( The PWM signal form sends a drive pulse to the compensation current generating circuit to drive the IGBT or IPM power module to generate a compensation current equal to the harmonic current amplitude of the grid and opposite in polarity, which is injected into the grid to compensate or cancel the harmonic current and actively eliminate Power harmonics.
Active power filter input and output terminal connection mechanism: consists of flame-retardant ABS terminal block, copper bar and fixing screw; use the fixing screw to connect the flame-retardant ABS terminal block with the corresponding grade copper bar Fixed connection; the copper row is correspondingly provided with an inner mounting hole and an outer mounting hole; and is mounted on the outer casing frame of the converter in the active filter through the mounting hole to play the role of connecting the inside and the outside. The utility model has the advantages of simple structure, ingenious design, reasonable layout, firm and stable connection, safe and reliable performance, flexible operability and practical effect.
Active Power Filter (APF) is a new type of power electronic device for dynamically suppressing harmonics and compensating for reactive power. It can compensate for harmonics of varying magnitude and frequency as well as varying reactive power. source.