Medium-stable intelligent voltage stabilizer

Abstract

The invention relates to the field of electric power technology, is widely applied to voltage regulating and stabilizing devices, and particularly relates to a medium-stable intelligent voltage stabilizing device which is simple to control, does not generate inverse peak voltage, is safe and reliable and has a good voltage regulating effect, and the medium-stable intelligent voltage stabilizing device comprises a three-phase voltage compensator and a three-phase voltage regulator.

Description

technical field [0001] The invention relates to the field of electric power technology and is widely used in voltage regulating and stabilizing devices, in particular to a medium-stable intelligent voltage stabilizing device. Background technique [0002] Electricity is one of the most important energy sources used in modern industry, agriculture and modern social life. As a commodity, it flows continuously, cannot be conveniently stored, and cannot be tested for quality before use; it is different from other commodities in that Its users are often far away from the power plant, and the electric energy generated by multiple generators is sent to the grid at the same time, and then sent to the user through multiple transformers and overhead lines or buried cables; the power supply party cannot take back the substandard power quality from the power supply network , users have no way to reject such power, so it is not an easy task to ensure the quality of power supply at the po...

AI Technical Summary

Problems solved by technology

At present, the voltage regulating devices on the market mainly include: on-load voltage regulating transformer, reactive power compensation equipment, VQC voltage and reactive power control device, induction voltage regulator, carbon brush AC voltage stabilizer, but these products have the following deficiencies: ①The unloaded voltage regulating transformer is cheap and reliable in performance, but it cannot be adjusted synchronously with the voltage change, and can only be adjusted after a power failure; ②The on-load voltage regulating transformer can be adjusted synchronously with the voltage change, but it is equipped with on-load It is difficult to avoid arcing when adjusting the voltage, so it needs frequent maintenance; ③ Reactive power compensation equipment has reliable performance, but it can only repair the voltage change caused by reactive power, and it cannot repair the voltage change caused by active power. Voltage changes; ④ VQC voltage and reactive power control device can ensure voltage quality, optimize grid reactive power flow, and play an important role in grid economic operation, but its continuous working safety time is ≤ 1000 hours; ⑤ Although the induction voltage regulator is reliable, But the response speed is slow, the voltage regulation speed is ≤5V / S, the efficiency is ≤93%, and the voltage regulation accuracy is ≤±5%; ⑥The voltage regulation speed of the carbon brush AC voltage regulator is ≤25V / S, which needs regular maintenance

[0014] The applicant also found that: 1. the off-load voltage regulating transformer cannot be adjusted synchronously with the voltage change, and can only be adjusted after a power failure, so it is troublesome to use and cannot effectively stabilize the voltage

It is also found that when the voltage rises, the excitation current of the transformer will increase, and the magnetic induction intensity B in the iron core will increase, resulting in an increase in iron loss and an increase in the temperature rise of the iron core, which will accelerate the aging of the winding insulation; ② When the on-load tap changer adjusts the voltage prone to arcing

It is also found that if the maintenance is not timely, it will cause a short-term undervoltage of the power supply, which will cause the advanced electrical equipment to stop working or be damaged, and may even cause the voltage collapse of the power supply system, which will have a negative impact on the production, operation, work and life of the power consumption area. ;③Reactive power compensation equipment cannot repair voltage changes caused by active power

It is also found that the reactive power of its capacitor is proportional to the square of the voltage. Although the reactive power increases when the voltage rises, the partial discharge is strengthened due to the enhancement of the electric field, which reduces the insulation life. >Under work, its life is reduced to about 44% of the rated life

It is also found that the explosion of the capacitor and the bulging of the shell are caused by the cumulative effect of partial discharge and insulation aging. It can be seen that the high voltage also seriously affects the expected service life of the reactive power compensation device and the safe operation of the power supply; ④VQC The continuous working safety time of the voltage and reactive power control device is ≥1000 hours. If the maintenance is not timely, it may cause a short-term undervoltage of the power supply, which will cause the advanced electrical equipment to stop working or be damaged, and even cause a major accident such as the collapse of the power supply system in the power consumption area.

At the same time, it is also found that the root causes of the above-mentioned ①②③④ are all caused by the unreasonable voltage regulation tap of the power transformer and the unreliability of the on-load voltage regulation tap switch; ⑤Inductive voltage regulator, voltage regulation speed≤5V / S, efficiency ≤93%, voltage regulation accuracy ≤±5%; ⑥The voltage regulation speed of the carbon brush AC voltage stabilizer is ≤25V / S, and regular maintenance is required

It is also found that if there is no regular maintenance, when the carbon brush wears seriously, it will burn the copper pillar and affect the power supply, and cause a safety accident

Images