GIS same frequency in-phase AC test method based on phase matching combination and phase shifting transformer

Abstract

The invention relates to a GIS same frequency in-phase AC test method based on a phase matching combination and a phase shifting transformer. The method comprises steps: S1, three-phase voltage signals on a bus voltage transformer are acquired as alternative voltage signals, and to-be-tested side bus voltage is acquired as reference voltage signals; S2, the bus three-phase voltage and another hopbus test voltage are subjected to impedance matching, filtering and signal amplification; S3, the bus three-phase voltage and the test voltage are inputted to a phase selection and automatic matchingdevice, and phase adjustment is realized through an RC network; S4, actual test voltage is acquired to be corrected with the bus three-phase voltage; and S5, a closed-loop feedback controller formed by a phase detection loop and a controller is used to form a feedback loop, the phase and the amplitude of the bus three-phase voltage are compared and corrected continuously, and a same frequency in-phase locking state between output voltage and reference voltage is realized.

Description

technical field [0001] The invention belongs to the technical field of GIS same-frequency and same-phase AC voltage withstand technology, and relates to a GIS same-frequency and same-phase AC test method based on a phase matching combination and a phase-shifting transformer. Background technique [0002] Due to the advantages of low land occupation, resource saving, and high reliability, high-voltage electrical distribution equipment (GIS) is more and more widely used in power systems, and has been widely used in the construction of many urban power grids. The test can reduce the scope of power outages in a large area, reduce the transfer load, and improve the reliability of power supply. In recent years, it has played a great role in GIS reconstruction and expansion projects. [0003] As the operating life of GIS equipment put into operation in the early stage increases, a large number of GIS equipment enters the maintenance cycle. In the expansion and overhaul of a large ...

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Problems solved by technology

[0006] The common feature of these methods is that they combine a large number of related power electronic technologies and some hardware drive or phase shift control technologies, and use a large number of power electronic devices, such as PWM control, SPWM control, rectification, and the control system is cumbersome and complicated. In the process, it is also necessary to provide an additional power supply with the same frequency and phase, and to ensure that the parameters of the additional power supply with the same frequency and phase as close as possible to the operating bus voltage, so many feedback systems and protection modules are added, and the cost is also greatly increased.

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