Active Power Filters (APF) are connected in parallel to the power grid. By detecting the harmonic and reactive components of the load in real time, PWM conversion technology is used to input the harmonic and reactive components into the power supply and distribution system, achieving the functions of suppressing harmonics and dynamically compensating reactive power.

Functional Features
The transmission and distribution system operates under fixed frequency sine wave voltage and Current waveforms. However, nonlinear loads, such as thyristors, frequency converters,and arc furnaces can generate a large amount of harmonic currents when connected to the system, leading to voltage and current distortion. Harmonic filtering is the best method to eliminate harmonic distortion in power systems,while generating reactive power at the fundamental frequency

Advantage

• The design of a tuned filter cabinet is used for power factor compensation in power grids that generate harmonics,as well as amplification to suppress harmonics.
• Each section of the tuned filter cabinet is composed of a capacitor and a reactor connected in series, forming as series resonant circuit The resonant frequency of the capacitor and reactor is tuned to be lower than the lowest harmonic present in the power grid, usually the fifth order (250Hz).
• Below the tuning frequency of the resonant circuit, such as the fundamental frequency (50Hz), the tuning filter is capacitive and emits reactive power to the power grid. If the tuning frequency is higher than the tuning frequency, the tuning filter is inductive,which mean it will not amplify other ordinary harmonics including 5th, 7th , and 11th order. Tuned filters can also absorb a portion of the low order harmonics in the power grid, ranging from 20% to 50%.
• Similar to conventional capacitor banks, each tuned filter is controlled by an automatic power factor controller to switch according to the reactive power requirements.

Our three-phase/single-phase meters are capable of high-precision electrical measurement and offer exceptional value for money. They feature a compact design, easy installation, and flexible functionality. The display can be configured with either an LED or LCD screen. In addition to standard measurement functions, they can be configured to include digital I/O, various communication protocols, analog transmitter outputs, and energy pulse outputs, among other options. Customized features are also available to meet specific customer requirements, ensuring we deliver products and services that satisfy our clients.