A method for measuring the parameters of the core components of the voltage equalizing capacitor circuit of the converter valve without disconnecting the wires
A voltage-equalizing capacitor and circuit core technology, applied in the field of non-disconnection parameter measurement of the core components of the voltage-equalizing capacitor circuit of the converter valve, can solve the problems of heavy workload, time-consuming and laborious, equipment damage, etc., to improve measurement efficiency and measurement results. Precise, high-precision measurement results
Active Publication Date: 2022-05-13
GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION
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Problems solved by technology
At present, the traditional test method for the core component parameters of the voltage equalizing capacitor circuit of the converter valve is relatively simple. Most of them use a multimeter, a capacitor bridge, etc. to measure each component one by one. Low efficiency, heavy workload, seriously affect the detection progress
In addition, although the existing impedance tester has high precision, it cannot realize the measurement of the core components of the converter valve without disconnecting the wiring. damage to original equipment
Method used
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Embodiment
[0037] A method for measuring the parameters of the core components of the voltage equalizing capacitor circuit of the converter valve without disconnecting the wires. The response characteristics of the equivalent circuit are analyzed and compared when the wiring is not removed, and the simplified law of the voltage equalizing capacitor circuit of the converter valve is obtained.
[0038] The simulation model modeling of the equivalent circuit of the voltage equalizing capacitor circuit of the specific converter valve is modeled using the circuit simulation software Pspice. Since the excitation signal can only be applied to both ends of a single valve section when measuring the voltage equalizing capacitor, a single The valve section is analyzed. The equivalent circuit diagram of a single valve section of the converter valve is as follows: figure 1 shown. where C G is the voltage equalizing capacitor to be tested; R H is the direct current resistance of the pipe. It can ...
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The invention discloses a method for measuring the parameters of the core components of the voltage equalizing capacitor circuit of the converter valve without disconnecting the wires. in and sampling resistor R c ; Apply two high-frequency AC voltage excitation signals with different frequencies at both ends of the valve section of the converter valve through the excitation circuit, and the frequency is not less than 1MHz, and obtain the current amplitude of the two excitation signals by means of the sampling resistor; use the converter valve The simplification law of the voltage equalizing capacitor circuit is equivalent to the circuit, the circuit is simplified, and the calculation formula of the total impedance of the voltage equalizing capacitor circuit of the converter valve is determined; according to the current value and the calculation formula of the total circuit impedance, the core components of the voltage equalizing capacitor circuit of the converter valve are calculated. The parameter value of the equalizing capacitor when the wire is disconnected. The invention realizes the parameter measurement of the voltage equalizing capacitor of the converter valve without disconnecting the wires. No matter the voltage is accurate to 10mV or 100mV, the error of the measured parameter value is within 5%, and the more valve sections, the more accurate the measurement result.
Description
technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to a method for measuring parameters of a core component of a voltage equalizing capacitor circuit of a converter valve without disconnecting the wires. Background technique [0002] When the transmission distance is long and the transmission capacity is large, DC transmission is the preferred transmission scheme. UHV DC transmission has the characteristics of point-to-point, ultra-long-distance, and large-capacity power transmission capabilities. It is the main transmission method for ultra-long-distance, ultra-large-capacity outbound transmission of my country's Southwest Large Hydropower Base and Northwest Large Coal Power Base. The converter station is one of the main components of the HVDC transmission system. It realizes the conversion from the AC system to the DC system and is the core technology of the HVDC transmission system. The converter...
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IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 陶敏梁家豪梁秉岗梁律马远张朝辉刘建业冯健棠
Owner GUANGZHOU BUREAU CSG EHV POWER TRANSMISSION