Dynamic voltage compensation device based on AC/AC converter

Abstract

The invention discloses a dynamic voltage compensation device based on an AC / AC converter in the electric / electronic technical field, which comprises an AC power supply, a power conversion main circuit module, a drive circuit module, a control signal generation module, a transformer module, a detection module and an auxiliary power module. The AC power supply is connected with the power conversion main circuit module, the converter module and the auxiliary power module respectively; the power conversion main circuit module is connected with the drive circuit module and the transformer module respectively; the derive circuit module is connected with the control signal generation module; the detection module is respectively connected with the power conversion main circuit module and the control signal generation module; and the auxiliary power module is connected with the drive circuit module, the control signal generation module and the detection module respectively. The invention doesnot require large-capacity capacitor or inductor, has low cost and is easy to implement; moreover, the dynamic voltage compensation device has over-current protection function, can control the polarity and amplitude of the compensation voltage, and ensures stable output voltage when the input voltage rises or falls unexpectedly.

Description

Technical field [0001] The invention relates to a device in the field of power electronics technology, in particular to a dynamic voltage compensation device based on an AC / AC (alternating current / alternating current) converter. Background technique [0002] Voltage sag refers to a phenomenon in which the voltage amplitude drops to 10%-90% of the rated voltage amplitude, and the duration is half a cycle to a few seconds. Most of the voltage drops are caused by factors such as short-circuit faults in power distribution lines and induction motors starting. [0003] Sudden rise in voltage refers to the phenomenon of sudden rise in voltage amplitude. The main reason is that the instantaneous voltage rise generated by the line caused by the lightning strike or the operation of the circuit breaker, the line failure or other reasons cause the system parameters to change, causing the voltage to rise. [0004] When the power supply voltage rises or drops suddenly, the static stability of th...

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Problems solved by technology

[0005] After searching the existing literature, it is found that the Chinese patent publication number is: CN201035433Y, and the name is: voltage regulator with bidirectional flow of energy. This technology uses DSP to control dual PWM converters to realize energy compensation for power grids. However, this technology uses capacitor charging. Discharging to achieve energy compensation requires the use of large-capacity capacitors, which are relatively expensive and have a relatively short life.

[0006] After searching, it was found that the Chinese patent publication number is: CN101521385A, and the name is: dynamic voltage compensator for three-phase power system. This technology uses two dynamic voltage compensators to realize three-phase voltage compensation, but this technology also requires energy storage Devices (such as batteries, capacitors or other energy storage elements) to achieve voltage compensation, making the topology more complex and costly

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