Active high voltage direct current switch oscillation loop parameter on-line measuring system and method thereof

Abstract

The invention discloses an active high voltage direct current switch oscillation loop parameter on-line measuring system and a method thereof, relating to high voltage direct current switch oscillation loop parameter measuring technology. In the invention, oscillation loop current is collected through a programmable automation controller PAC and a Hall current sensor, and a collected current signal is transmitted to a background PC machine through a GPRS wireless transmission module to realize on-line detection of high voltage switch oscillation loop current; then the background PC machine asa workbench carries out programming to process data, i.e. genetic algorithm is applied to analyze the current data received by a background industrial control computer. According to the invention, R,L, and C parameters of the direct current switch oscillation loop can be measured on line at any time to guarantee stabilization of current waveform generated by the oscillation loop, and ensure a long-term reliable operation of a direct current power transmission system and safety and stabilization of the whole system.

Description

technical field [0001] The present invention relates to a high-voltage DC switch oscillation circuit parameter measurement technology, in particular to an active high-voltage DC switch oscillation circuit parameter [resistance (R), inductance (L), capacitance (C)] online measurement system and method . Background technique [0002] Since the end of the 1980s, the research on DC transmission technology in my country has made rapid progress. At present, there are more than ten ±500kV DC projects in China that have been put into operation. my country plans to put more than 30 DC projects into operation before 2020; at the same time, in order to realize the strategy of "power transmission from west to east", the country is vigorously promoting UHV DC transmission projects including ±400kV, ±660kV, ±800kV and ±1000kV In the future, DC transmission will become an important part of my country's power grid. [0003] The DC switch is one of the important equipment in the converter s...

AI Technical Summary

Problems solved by technology

[0008] 1. The premise of calculating the inductance L and resistance R according to the test current waveform is that the capacitive reactance value of the capacitor C must be known, and the field test generally uses a multimeter to estimate the capacitance value, which also brings errors to the calculation accuracy

[0009] 2. When building the test circuit, devices such as voltage regulators and rectifiers must be configured. Since the entire DC circuit breaker is installed on an insulating platform, when charging the capacitor C, it is necessary to lead down from both ends of the capacitor C; at the same time In order to connect the resistance shunt meter R in series to the discharge circuit, a wire must be removed from a connection port of the oscillating circuit. The wiring of this test method is relatively cumbersome, and the staff needs to climb up and disconnect the wire on site; what is more serious is that due to The inductance and resistance of the connected wires will seriously affect the validity and accuracy of the calculated inductance and resistance values

[0010] 3. The entire test process must be carried out in an offline state, resulting in the lack of real-time performance of the measured waveform and calc

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