Active filter is a new type of power electronic device used to dynamically suppress harmonics and compensate for reactive power. It compensates for harmonic and reactive power changes in size and frequency.
active filter
Active filters can effectively filter the 2nd to 25th harmonics in the load current, making the distribution network clean and efficient and meeting the national standards for distribution network harmonics. The active filter truly realizes adaptive tracking compensation, which can automatically identify the overall change of the load and the change of the load harmonic content, and quickly track the compensation.
Active filters can completely eliminate system imbalances caused by harmonics. If the equipment capacity permits, the fundamental negative sequence and zero sequence unbalanced weight of the system can be compensated according to user settings, and the reactive power can be compensated appropriately. On the basis of ensuring harmonic function filtering, the system imbalance is effectively improved.
Active filters will not resonate with the power grid and can effectively suppress the resonance of the power grid itself within the scope of its capacity. This is something that passive filters cannot do. The active filter has protection functions such as overcurrent, overvoltage, undervoltage, excessive temperature, measurement circuit failure, lightning strike, etc. to ensure the safe operation of the device and power system. It will automatically exit operation under light load and fully consider the economy of operation.