The relationship between capacitors and harmonics is very close, especially in power systems. The use of capacitors can affect the generation and propagation of harmonics, and are also easily affected by harmonics, leading to reduced performance or damage.
Harmonic amplification
In the power system, capacitors have a lower impedance to harmonics, so harmonic currents tend to flow through the capacitors. When there are harmonic sources in the power grid, the connection of capacitors may exacerbate the amplification of harmonic currents, especially when the capacitance of capacitors forms parallel resonance with a specific harmonic frequency in the system, the harmonic currents will be greatly amplified, leading to capacitor overheating or even damage.
Shortening the lifespan of capacitors
Harmonic currents can cause overloading of capacitors, increasing their temperature rise. Prolonged operation at high temperatures can accelerate dielectric aging, greatly reducing the lifespan of capacitors.
System stability is affected
Severe harmonic problems combined with the parallel circuit of capacitors may cause voltage fluctuations, flicker, three-phase imbalance, and other problems in the system, affecting the stability and power quality of the entire power system.
Solution for harmonic
Special capacitors
using anti harmonic capacitors or smart capacitors, they are designed with the function of harmonic suppression in mind, and have good anti harmonic ability and high overload bearing capacity.
Series reactor
By connecting appropriate reactors in the capacitor circuit, the impedance of the capacitor branch to harmonics can be increased, the inflow of harmonic currents can be limited, and resonance phenomena can be avoided.
Active Power Filter (APF) and Static Var Generator (SVG)
These devices can detect and compensate for harmonic currents in the power grid in real time, fundamentally solving harmonic problems, and also performing reactive power compensation to improve power factor.
YTPQC-AHF
AHF (Active harmonic filter) is designed for the problem of harmonic in the power grid. It can detect harmonic currents in the power grid in real time and generate compensation currents that are equal in magnitude and opposite in direction to the harmonic currents, thereby offsetting the harmonic components in the power grid. AHF can significantly improve power quality, reduce the impact of harmonics on the power grid and sensitive loads, and prevent equipment overheating, decreased work efficiency, and shortened lifespan caused by harmonic problems.
Any technical inquiry about Static Var Generator(SVG) or Active Harmonic Filter(AHF), contact with us [email protected]
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