Mixing type idle work compensator

Abstract

This invention discloses a mixed virtual work compensation device including a passive and an active virtual work compensators in series, the said passive one is an AC power capacitor for providing an advanced virtual work volume to reduce the capacity of the active one which is composed of a power converter, a DC energy storage capacitor, a high frequency ripple filter and a controller and enables the compensated virtual work volume of the mixed to segmentlessly regulate in a specific sphere and makes current of the passive one close to sine wave.

Description

technical field [0001] The present invention relates to a hybrid reactive power compensation device, in particular to a device for reactive power compensation using a passive reactive power compensator and an active reactive power compensator connected in series in a power transmission and distribution system. The reactive power provided by it can be adjusted linearly within a certain range, and the active reactive power compensator of the present invention has the function of making the current of the passive reactive power compensator nearly sinusoidal, which can avoid passive reactive power The reactive power compensation device resonates with the reactance of the power system, which causes the failure of the reactive power compensation system itself and adjacent power equipment. Background technique [0002] Most of the loads in the existing power transmission and distribution system are inductive, which causes the lagging power factor of the system. Therefore, in order ...

AI Technical Summary

Problems solved by technology

However, due to the phase control of the thyristor, a large amount of harmonics is generated, causing harmonic pollution

[0006] Although the above two devices can adjust the amount of reactive power compensation, the AC power capacitor is still directly connected in parallel with the power system, so the problem of resonance damage cannot be avoided

[0007] Please refer to image 3 , which discloses that equipment composed of high-power power electronic components can also be used in the output transformer power distribution system for reactive power compensation. It is called an active reactive power compensator, which uses a power converter (power converter) through the link An inductor 21 is connected to the power system 1, and its DC side is connected to a DC energy storage capacitor 22. Through the control of the power converter 20, the active reactive power compensator 2 can provide leading or lagging reactive power, And the reactive power provided by it can be adjusted linearly according to the load change, so that the input power factor can be maintained at unity power factor, and the active power factor correction system will not resonate with the power system, so there will be no AC power capacitor resonance However, since the capacity of the active reactive power compensator 2 must contain all the reactive power required by the load, it requires a very large capacity, making it very expensive, thus limiting its practicability

Images