Differences between APF active filters and LC filters

Release time:

2023-09-03

The sales and consulting volume of APF active filters are in a frenzied growth trend, and they have gradually become one of the important solutions for power integration. It can achieve the purpose of active filtering by efficiently extracting the harmonic components in the load current. Now, active filters are different from traditional ones
Briefly explain and analyze the differences between LC filters:
1. Compared to LC filter, active filter adds dynamic compensation function
In the old days, many companies liked to use LC filters, but due to their lack of dynamic tracking function, their compensation filtering efficiency was much lower than that of active filters. In fact, the active filter adds dynamic compensation function compared to the LC filter, as it will be sent to the internal IGBT through PWM signal.
2. Active filters can accurately compensate for harmonics that vary in size and frequency
Active filters can use external current transformers to monitor the load current in real time, so that harmonics in the load current can be quickly calculated. Therefore, it can accurately compensate for harmonics that vary in size and frequency, while traditional LC filters cannot achieve accurate compensation.
3. The harmonic elimination and reactive power compensation of active filters are more powerful
The reason why active filters can replace traditional LC filters as new filtering compensation tools. This is because APF active filters can generate compensation instructions through reverse polarity, thereby achieving harmonic elimination and compensating reactive power. This is one of the important reasons why new power electronic devices require the installation of active filters.
The APF active filter is internally made of mature and stable components, making it easy to maintain and install, as well as powerful filtering and harmonic removal functions. According to some shared feedback, active filters not only add dynamic compensation functions compared to LC filters, but also accurately compensate for harmonics that vary in size and frequency. At the same time, their harmonic elimination and reactive power compensation are more powerful.