Reactive power compensation and filtering integrated device

Abstract

The invention discloses a reactive power compensation and filtering integrated device and belongs to a power supply technology field, wherein the device is used for solving a reactive power compensation and harmonic control problem at a power supply end. The reactive power compensation and filtering integrated device comprises an active dynamic filter and a reactive power compensator, wherein the active dynamic filter comprises a harmonic sampling current transformer, a s sampling board, a PLC controller, a high frequency filter and an IGBT module, and both ends of the high frequency filter are connected in series with reactors; the reactive power compensator comprises a power capacitor bank, reactors, a capacitance compensation controller connected with a power network through a current transformer, and the power capacitors is connected with the power network through a bidirectional thyristor circuit; and a bidirectional thyristor circuit comprises two inversely parallel thyristors, and wire inlet poles of the two thyristors are connected with wire outlet poles through an RC filter circuit, and after being connected in parallel, control poles of the two thyristors access the capacitance compensation controller. A parallel operation controller coordinates the active dynamic filter and the reactive power compensator actions to prevent compensation conflicts.

Description

technical field [0001] The invention relates to an integrated device for reactive power compensation and filtering, which belongs to the technical field of power supply circuits. Background technique [0002] In the process of oil field construction, large electric drilling rigs are often used. Since electric drilling rigs are inductive loads, the power factor of the power grid is relatively low. Therefore, in order to improve the power factor and reduce unnecessary losses, capacitance compensation must be performed on the power grid. In addition, during the working process of the electric drilling rig, it will also cause high-frequency harmonics in the power grid. At present, the most common method is to install reactive power compensators in power distribution rooms to reduce reactive power loss and improve power factor. Resonance occurs near the 3rd and 5th harmonic frequencies, which has a certain amplification effect on the 3rd and 5th harmonics. [0003] Another appr...

AI Technical Summary

Problems solved by technology

In fact, it is impossible to install an active filter next to each electrical equipment, so the cost is too high. Only installing active filters for high-power electrical equipment is limited to harmonic control. There are too many computers, printers, fluorescent lamps, inverter air conditioners, TV sets, refrigerators, etc. on the same line. Although the harmonic energy generated by each of these daily electrical equipment is not large, the number of daily electrical equipment is huge. The generated harmonic energy is superimposed far beyond the harmonic energy generated by a high-power electrical equipment

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