The filtering compensation device is mainly suitable for high-voltage (6KV, 10KV, 20KV, 35KV) high-power rectification equipment and places where harmonics exceed the standard. The equipment uses filtering reactors, filtering capacitors, discharge coils, and non inductive resistors appropriately combined to form LC filtering circuits (single tuned filtering circuits, high pass filtering circuits), which are connected in parallel with harmonic sources. In practical design, the filtering device is designed based on the composition, magnitude, and reactive power demand of harmonic currents. Through precise simulation and calculation, it provides a low impedance channel for harmonics, allowing most of the harmonic currents in the system to flow into this low impedance channel.
According to the actual situation of the load, it is divided into 3-phase 6-pulse rectification, 6-phase 12 pulse, and 12-phase 24 pulse. A single harmonic circuit and a high pass filtering circuit can be used to form a filtering system, which filters out the harmonic components in the system and meets the requirements of fundamental compensation output. The single tuned filtering circuit filters out characteristic harmonics in the power grid, which can absorb most of the system and reduce voltage distortion; For the fundamental frequency (50Hz), the filtering device can provide reactive power to the system to improve the power factor and achieve reactive power compensation. The high pass filtering circuit has a wide frequency band range above a certain frequency, which is used to absorb several higher frequency harmonics, achieve filtering effect, and compensate for reactive power to reduce voltage distortion.
