Load characteristics
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Due to the large number of non-linear loads such as welding machine, laser welder and large inductive load (mainly motor) in the body shop, serious harmonic currents exist in all the load current of the transformer in this workshop 3 times, 5 times, 7 times, 9th and 11th respectively. The total voltage distortion rate of 400V low voltage busbar is over 5%, and the total current distortion rate (THD) reaches about 40%, causing the voltage total harmonic distortion rate of 400V low voltage power supply and distribution system seriously exceeding the standard, And led to the use of electrical equipment and transformers there is a serious harmonic power loss. At the same time, all the transformer load currents in the workshop have serious reactive power demand. Some transformers have an average power factor of only about 0.6, which poses serious power loss problems and leads to serious shortage of output power capacity of transformers.
Due to a large number of harmonic currents and a large number of reactive power requirements, resulting in serious heat of the main transformer, the power distribution system has the following power quality problems:
● Reactive power shortage is large
● Harmonic current is serious
● Power loss
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solution
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Low-voltage dynamic compensation with active filter centralized filter compensation scheme
● Thyristor switch dynamic compensation device used to safely enhance the power factor
● LDIPF active filter part is used to filter out system-side harmonics
Description: Reactive power compensation scheme design, can be based on the active part of the passive part of the capacity allocation, flexible configuration. If the active part of the bidirectional compensation reactive capacity sufficient to adjust dynamically changing reactive power, consider the use of static safety compensation device.
