Harmonic filters, an essential component in power systems offered by Sinotech Group, operate through specific mechanisms to mitigate harmonic distortions. In electrical systems, non-linear loads such as variable frequency drives, rectifiers, and switching power supplies generate harmonic currents, which distort the sinusoidal waveform of the electrical supply. Passive harmonic filters, a common type, consist of capacitors, inductors, and resistors arranged in specific configurations. These components are tuned to resonate at specific harmonic frequencies. When harmonic currents flow through the passive filter, the capacitors and inductors create a low-impedance path for the harmonic frequencies, diverting them away from the main power system and thus reducing the harmonic content in the supply. For example, a series-tuned filter is designed to resonate at a particular harmonic frequency, effectively short - circuiting that frequency and preventing it from propagating through the system.
Active harmonic filters, on the other hand, take a more dynamic approach. Sinotech Group's active harmonic filters use advanced power electronics and control systems. First, sensors continuously monitor the electrical current and voltage in the power system. The control system, equipped with sophisticated digital signal processing algorithms, analyzes the monitored data to identify the harmonic components present in the load current. Based on this analysis, the control system generates control signals that are sent to power electronics converters, typically made up of insulated - gate bipolar transistors (IGBTs). These converters then generate compensating currents that are equal in magnitude but opposite in phase to the detected harmonic currents. When injected into the power system, these compensating currents cancel out the harmonic components, restoring the electrical current to a clean, sinusoidal waveform. This real - time detection and compensation mechanism make active harmonic filters highly effective in dealing with varying and complex harmonic conditions, ensuring stable and efficient operation of electrical equipment connected to the power system.