PQ HUB
Hengke New Material Co., Ltd.
Active Harmonic Filter
The Industry
Reduced harmonic levels results in improved electrical network reliability and reduced operating costs. Nuisance tripping of protective devices and nuisance clearing of fuses due to harmonic heating effects is greatly reduced.
Overheating of motors, transformers, switch-gear and cables is also reduced which increases their life expectancy and reduces maintenance costs. For new installations, over-sizing of distribution equipment to reduce harmonic susceptibility can be reconsidered.
Background
The main loads used in the chemical industry are motors. With the maturity of science and technology and more and more development towards energy saving and intelligent direction, a large number of energy saving and a large number of inverter leads to a large number of 3 / 5 / 7 / 11 (2n + 1) sub harmonics.
Power Quality Problem
Jiangsu hengke new material co., LTD. is located in Nantong TongZhou Binjiang district (WuJie Town) HengLi textile new material industrial park, park with a total investment of 20 billion yuan, stage construction annual output of 2.4 million tons of differentiated, functional new fiber and intelligent, super simulation function polyester new materials, science, industry, trade integrated industrial base, high-tech textile materials.
The harmonic source is mainly 6-pulse frequency converter at site, and the main harmonics are 5th or 7th harmonics.
Solution
The harmonic source is mainly 6-pulse frequency converter at site, and the main harmonics are 5th or 7th harmonics. According to the load situation, 2 sets 450A Active Harmonic Filter panels and 4 sets 375A Active Harmonic Filter panels are configured for harmonic control.
Performance
Take a 375A AHF panels for example, THDi is 50% before AHF, and the THDi reduced to 5% after AHF installation. The compensation effect is good, which completely solves the reactive and harmonic problems in the field.
Current waveform before compensation
Current waveform after compensation
Current distortion rate before compensation
Current distortion rate after compensation
Reactive power and PF before compensation
Reactive power and PF after compensation