Reactive power compensation is different from harmonic control

Are reactive power compensation and harmonic control two different things? Why do filter manufacturers all offer reactive power compensation?

For this score, the editor will explain it to everyone

Firstly, in the absence of harmonics, reactive power has its fixed viewpoint and definition. In the presence of harmonics, the definition of reactive power is closely related to harmonics, and harmonics can also affect the reactive power of loads and the power grid, affecting the power factor.

So there's a conclusion, it's not two different things, what's the specific connection? Listen to the editor continue chatting with you!

Secondly, the assembly that generates harmonics, that is, the harmonic source, is mostly an assembly that consumes fundamental reactive power, such as various power electronics assemblies, electric arc furnaces, transformers, etc. Look at the culprits, the capital is one.

The assembly for compensating harmonics again usually involves compensating for the reactive power of the fundamental wave. Many types of LC passive filters and active power filters can compensate for reactive power. High power factor rectifiers not only limit harmonics but also improve power factor. The prescription is also the same, and it is highly recommended to use LSVG, which can effectively manage all power quality achievements!

Please ask the technical staff to provide specific explanations and clarifications before leaving the factory

When our load is a linear load and there are no harmonics in the system, the power factor is equal to cos.

If there are harmonics in the system

From the original definition of power factor, we can perhaps derive a complete expression for power factor: §=β cos α

Here: §: Power factor of the system. I1， Fundamental current, I， Total current. α， Current phase angle.

β＝I1/I， It's called the fundamental factor. Representing the proportion of fundamental current to total current.

cosα， It's called a phase shift factor. That is, the power factor of the fundamental wave.

From the expression, it can be seen that when the total current remains constant, harmonic growth will inevitably lead to a reduction in the fundamental current, resulting in a decrease in the fundamental factor and a decrease in the power factor. Unusually, the current undergoes multiple phase shifts, resulting in a low phase shift factor and a decrease in power factor.

Therefore, power users with harmonic sources cannot simply rely on the readings of the power factor meter in reactive power compensation management, but also need to pay timely attention to the harmonic distortion and reactive power caused by the presence of harmonics.