Hybrid filtering compensation device

Abstract

A hybrid filtering compensation device is characterized in that a grid-side signal acquisition module sends a signal detected on a current-voltage transformer CT1 on the grid side to a passive filtering compensation module, a shunt reactor L outputs inductive reactive power for compensating the capacitive reactive power generated by a filtering compensation branch; a load-side signal acquisition module sends a signal detected by a current-voltage transformer CT2 on the load side to an active filtering module; a knife switch QK is connected with a busbar between the grid side and the load side; The wire output end of the knife switch QK is connected with three fuses; the three fuses are connected with the shunt reactor L, the passive filtering compensation module, the active filtering module, and a touch screen controller; a circuit breaker QF1 is installed between a power main circuit and the wire input end of the passive filtering compensation module, and the touch screen controller is connected with the passive filtering compensation module and the active filtering module through a 485 communication bus.

Description

technical field [0001] The invention relates to a hybrid filter compensation device, in particular to a hybrid filter compensation device, that is, a combination of a passive filter branch module and an active filter. Background technique [0002] At present, with the rapid development of power electronic technology, the existing low-voltage reactive power compensation equipment cannot flexibly change the compensation method or increase or decrease the compensation capacity due to its single structure and function. Such as frequency conversion speed control equipment, frequency conversion motor starting equipment, intermediate frequency furnace, arc welding machine, household appliances, electronic appliances, etc., generally lead to distortion of current and voltage waveforms and higher harmonics. Moreover, some electrical equipment loads increase or decrease within a certain period of time. Ordinary compensation not only cannot meet the effect of increasing or decreasing t...

AI Technical Summary

Problems solved by technology

Among them, the LC passive filter compensation module mainly plays the role of harmonic and reactive power compensation; the shunt reactor is connected in parallel in the main circuit to output inductive reactive power to offset the excess reactive power of the filter circuit, ensuring that the power factor is not compensated while filtering; The object compensated by the active power filter compensation module is the remaining system harmonic current after filtering by the passive filter compensation module. At this time, the harmonic content in the system current is greatly reduced. Therefore, the active power filter compensation module The capacity requirements are not high, and the active filter module can also improve the filtering characteristics of the LC passive filter compensation mode, and overcome the shortcomings of being easily affected by the grid impedance and easily resonating with the grid impedance

Images