1000 KV UHV AC power transmission line capacitive charging reactive power dynamic compensation device

Abstract

The invention discloses a 1000 KV UHV AC power transmission line capacitive charging reactive power dynamic compensation device, which belongs to the technical field of power equipment, and is composed of an auto-coupling voltage equalizing transformer, a self-saturation magnetically controlled reactor, a neutral point grounding reactor and a computer measurement and control system. Due to the adoption of the auto-coupling voltage equalizing transformer, the single-phase self-saturation magnetically controlled reactor with rated operating voltages being 500 / (square root 3) KV and 250 / (square root 3) KV and rated capacity being 250MVar and 125MVar can operate in a 1000 KV voltage class system, thereby making the realization of the 1000 KV UHV AC power transmission line capacitive charging reactive power dynamic compensation device possible. When an UHV AC power transmission line operates normally, the self-saturation magnetically controlled reactor operates in a magnetic control mode. The voltage of the UHV AC power transmission line rises to 120% of the rated voltage during sudden load interruption of the line, the self-saturation magnetically controlled reactor automatically switch into a self-saturation mode instantly, and absorbs 130% of the rated capacity inductive reactive power, so as to suppress the rise of the voltage of the UHV AC power transmission line.

Description

technical field [0001] The invention discloses a capacitive charging reactive power dynamic compensation device for a 1000KV ultra-high voltage AC transmission line, which belongs to the technical field of electric power equipment. Background technique [0002] For the existing 1000KV UHV AC transmission line, shunt reactors with a compensation degree of not less than 90% are installed at both ends of the line and at the middle voltage support point of the line to prevent the line from appearing when the UHV AC transmission line is under light load or fault load shedding. Power frequency overvoltage. However, when the UHV AC transmission line is in normal operation and transmits wave impedance power, the voltage everywhere along the line is the rated voltage of the line, and the reactive power everywhere along the line is zero, that is, the distance between the distributed inductance and the distributed capacitance of the UHV AC transmission line At this time, the inductive...

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Problems solved by technology

However, when the UHV AC transmission line is in normal operation and transmits wave impedance power, the voltage everywhere along the line is the rated voltage of the line, and the reactive power everywhere along the line is zero, that is, the distance between the distributed inductance and the distributed capacitance of the UHV AC transmission line At this time, the inductive reactive power required by the shunt reactors at the two ends of the UHV AC transmission line and the voltage support points in the middle of the line are all provided by the power system at both ends of the UHV AC transmission line. The power system at both ends of the AC transmission line poses extreme pressure

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