Voltage regulating control device of on-load voltage regulating transformer

Abstract

The invention discloses a voltage regulating control device for an on-load tap changer, which comprises an on-load tap changer, a voltage regulating control device, and a voltage regulating transmission device, wherein the on-load tap changer is used for being accessed to external AC and outputting distribution network voltage to an external load after transformation; the voltage regulating control device comprises a power adaption module, a microcontroller, and a voltage sampling module; the voltage regulating transmission device comprises a stepper motor, a gear device and a rack; the power adaption module is connected with an external power supply for converting voltage of the external power supply to provide power; the voltage sampling module is accessed to the distribution network voltage for sampling the distribution network voltage, generating a sampling signal and sending the signal to the microcontroller; the microcontroller is connected with the stepper motor for receiving the sampling signal and controlling rotation of the stepper motor; the stepper motor enables the gear device to rotate through rotation; the rack is engaged with the gear device, the rack moves linearly through rotation of the gear device, and an adjustable transformer tap is fixedly arranged on the rack, and the transformer tap can adjust the transformation ratio of the on-load tap changer along with movement of the rack.

Description

technical field [0001] The invention relates to the field of power control, in particular to a voltage regulation control device for an on-load voltage regulation transformer. Background technique [0002] In my country's power grid, excessive voltage offset has become a common problem, which not only seriously affects the safe operation of power transmission equipment and facilities, but also shortens the service life and the effective and reasonable use of my country's electric energy. [0003] When the voltage deviation is too large, it will affect the quality and output of industrial and agricultural products, damage equipment, and even cause a systematic "voltage collapse", causing large-scale power outages. It is an effective measure to regulate voltage in the power system with abundant reactive power by changing the tap of the on-load tap-changing transformer. The on-load tap changer can switch taps manually or automatically to achieve voltage regulation under load c...

AI Technical Summary

Problems solved by technology

[0004] At present, the on-load tap changer adopts mechanical tap changer for voltage regulation and uses semiconductor logic circuit. This voltage regulation method has at least the following defects: (1) It is easily affected by the complex electromagnetic environment of the substation, and its performance is not stable enough. Not reliable enough; (2) requires additional analog-to-digital converter

(3) The use of mechanical voltage regulating tap-changers will generate arcs, slow action speed, inconvenient maintenance, and high failure rate

(4) There are only a few fixed taps, and it is impossible to realize stepless smooth voltage regulation

(5) It cannot automatically maintain the constant voltage of the distribution network

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