Method and system suitable for chained flexible arc extinction measurement control

Abstract

The invention relates to the field of high-voltage equipment, and discloses a method and a system suitable for chained flexible arc extinction measurement control. The method and the system are applied to a power distribution network, the power distribution network comprises a chained converter, a reactor and a three-phase circuit, and a neutral point is arranged between the reactor and the three-phase circuit. The method comprises the following steps of controlling a chained converter device to output a plurality of preset voltages so as to obtain resistance to ground and capacitance to ground of a power distribution network, and when the power distribution network has a fault, according to the obtained capacitance to ground and resistance to ground, controlling the chain type converter device to output a corresponding voltage so as to compensate the current of the neutral point. According to the technical scheme, the chained flexible arc extinction measurement control method and system have the advantages that the chained converter device is controlled to output different voltages so as to measure the current value and the voltage value of the neutral point, accurate resistance to ground and accurate capacitance to ground are obtained, and compensation control during single-phase ground faults is achieved.

Description

technical field [0001] The invention relates to the field of high-voltage equipment, and discloses a method and system suitable for chain type flexible arc suppression measurement and control. Background technique [0002] The principle of arc suppression needs to use the ground parameters to calculate the ground compensation current, so how to accurately measure and calculate the ground fault current is a key part of the current arc suppression method. At present, most literatures only focus on the measurement of ground capacitance parameters, and cannot measure ground resistance. At the same time, due to the large ground leakage resistance, the difference between the injected current and the zero-sequence voltage is close to 90°, and the error in calculating the leakage resistance is relatively large. Contents of the invention [0003] Aiming at the above-mentioned problems existing in the prior art, a method and system suitable for chain-type flexible arc suppression me...

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Problems solved by technology

[0002]The principle of arc suppression needs to use the ground parameters to calculate the ground compensation current. Therefore, how to accurately measure and calculate the ground fault current is a key part of the current arc suppression method. The most important is the tuning method in the indirect measurement method, but due to the limitation of conditions, most of the literature is only for the measurement of the ground capacitance parameters, and the ground resistance cannot be measured. At the same time, because the ground leakage resistance is very large, the injection current and zero sequence The voltage difference is close to 90°, and the error in calculating the leakage resistance is large

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