Active power filter (APF) is a filter that can eliminate harmonics. Active power filters can be used to filter out harmonics in the power system, which are significantly lower than the switching frequency of the filter.

Compared with the conventional passive filter and a static VAR compensator, active power filter (APF) is considered to be viable options harmonics and reactive power requirements of a nonlinear load compensation.

APF series active filter is a three-level, high-power cryptographic power electronic product independently developed by Guangdong Huizhihua Electric Co., Ltd., with completely independent intellectual property rights, which has been used to suppress power harmonics and dynamic reactive power compensation. The product technology has reached the domestic leading level, and the product series includes 30A, 50A, 75A, 100A, 150A, 200A, specifications. With harmonic compensation, reactive power compensation, three-phase imbalance compensation functions, it can be flexibly configured into a single, mixed mode compensation mode, and can be widely used in 0.4KV power supply system power quality improvement.