gis same frequency and same phase test method based on phase matching combination and phase shifting transformer

Abstract

The invention relates to a GIS same-frequency and same-phase AC test method based on a phase matching combination and a phase-shifting transformer, including S1: collecting the three-phase voltage signal on the bus voltage transformer as an alternative voltage signal, and collecting the bus voltage on the side to be tested as a reference Voltage signal; S2: The three-phase voltage of the bus and the test voltage of another jump bus are subjected to impedance matching, filtering, and signal release; S3: The three-phase voltage of the bus and the test voltage are input into the phase selection and automatic matching device, and the phase adjustment is realized through the RC network ; S4: Collect the actual test voltage and the bus three-phase voltage for calibration; S5: Use the closed-loop feedback controller formed by the phase detection loop and the controller to form a feedback loop to realize the continuous comparison and correction of the bus three-phase voltage phase and amplitude , to achieve the same frequency and phase locking state between the output voltage and the reference voltage.

Description

technical field [0001] The invention belongs to the technical field of GIS same-frequency and same-phase AC withstand voltage, and relates to a GIS same-frequency and same-phase 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 number of GIS ...

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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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