Short circuit current limiting device for harmonic suppression and reactive compensation

Abstract

The invention relates to a short circuit current limiting device for harmonic suppression and reactive compensation, belonging to the technical field of fault current limiting. The short circuit current limiting device comprises a short circuit current limiting reactor, a three-phase current converter, a system power supply, a load and a high-pass filter, wherein the short circuit current limiting reactor is connected between the system power supply and the load in series; and the three-phase current converter is connected with the load in parallel through the high-pass filter. When the system works normally, the three-phase current converter is used for performing the reactive compensation and the harmonic suppression at the load side; meanwhile, the corresponding reactive power is injected through the three-phase current converter to compensate the voltage drop generated on a circuit by the short circuit current limiting reactor; when the system is in short circuit at the load side, the three-phase current converter triggers pulse through locking an IGBT (Insulated Gate Bipolar Translator) to quit the operation quickly, and the short circuit current limiting reactor plays the role of current limiting instantly. The short circuit current limiting device for the harmonic suppression and the reactive compensation has the advantage of improving the power supplying reliability and the system stability because the short circuit current is limited quickly and reliably during fault operation and the harmonic suppression and reactive compensation functions of the nonlinear load can be realized.

Description

technical field [0001] The invention belongs to the technical field of fault current limitation and provides a short-circuit current limitation device which takes into account both harmonic suppression and reactive power compensation. Background technique [0002] With the expansion of power system capacity, short-circuit faults will damage the power system and its equipment more and more seriously, causing inconvenience to people's production and life. Traditional fault current limiting devices use series technology to limit current, which has the problems of single function and low efficiency. [0003] The invention provides a short-circuit current limiting device that takes both harmonic suppression and reactive power compensation into account, not only to limit the fault current when a short-circuit fault occurs, but also to effectively control load harmonics and reactive power problems when the system is in normal operation. Advanced harmonic suppression and reactive p...

AI Technical Summary

Problems solved by technology

[0002] With the expansion of the capacity of the power system, the damage to the power system and its equipment caused by short-circuit faults is becoming more and more serious, causing inconvenience to people's production and life.

The traditional fault current limiting device uses series technology to limit current, which has the problem of single function and low efficiency

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