What is harmonic?
Harmonic refers to the electric quantity with the frequency of integral times of the fundamental wave contained in the current. Generally, it refers to the Fourier series decomposition of periodic non-sinusoidal electric quantity. In addition to the electric quantity with the fundamental wave frequency, the electric quantity of the current greater than the fundamental wave frequency is called harmonic.
The harmonic number is the ratio of the harmonic frequency to the fundamental frequency.
Source of harmonics
At present, the electrical equipment is complicated, and the non-linearity of the load is more and more common, resulting in a bad harmonic environment, which poses a great threat to the safe and normal operation of the power system and equipment.
Among them, such as air conditioners, water pumps, fans, elevators, computer room network equipment, office equipment, UPS, lighting control system, fire control system, monitoring systems, and other power electronic equipment.
What are the hazards of harmonics?
What are the benefits of harnessing harmonics?
Direct benefits: 1. Protect the capacitor from interference; 2. Reduce the loss; 3. Reduce the heating of the line and busbar; 4. Protection of electrical equipment
Indirect benefits: improve the power quality of the system, reduce the capacity burden of the distribution system, and protect the safe and stable operation of electrical equipment.
Social benefits: eliminate harmonics from the source of each low-voltage harmonic source and prevent harmonic current from flowing into the upper power grid.
What standards do harmonics follow?
How to manage harmonics?
Aiming at the harmonic problem, Strong power Electric has developed an active power filter (AHF). AHF modular design organic rack type, wall mounted, and other models. Modern power electronic technology, intelligent control, fast and dynamic compensation of arbitrary harmonic; At the same time, it has the functions of harmonic compensation, reactive power compensation, and unbalanced compensation.
THDi < 5% after AHF 2-50th harmonic compensation, cos φ 0.99 level compensation effect.
