Test loop and test method for verifying function of high-voltage direct-current transmission hybrid converter
A high-voltage direct current transmission and test circuit technology, which is applied in the direction of power supply test, instrument, and measurement circuit, can solve the problem of high voltage and power requirements for full-power test
Active Publication Date: 2021-04-09
TSINGHUA UNIV
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Problems solved by technology
However, due to the high voltage and power requirements for the full-power test of the hybrid converter with three-phase six-legs, the existing technology cannot meet the technical requirements, so the high-voltage direct current transmission hybrid converter in actual work How the performance is, yet to be tested and verified
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[0070] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0071] The test circuit and application structure diagram for verifying the function of the HVDC hybrid converter provided by the present invention are as follows figure 2 shown. Wherein, C is the test main valve string (i.e. one of the bridge arms of the high-voltage direct current transmission converter of the test target ...
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The invention provides a test loop and a test method for verifying the function of a high-voltage direct-current transmission hybrid converter. A main branch in the test loop comprises a direct-current capacitor charging and discharging branch A, a main branch direct-current capacitor C1, a main branch inductor Li, a thyristor valve string S1-SNS and a turn-off tube valve string A1-ANA. An auxiliary converter branch comprises an auxiliary thyristor, a diode valve string B, a direct current capacitor C2 of the auxiliary converter branch, an inductor Lc of the auxiliary converter branch, a thyristor valve string S1-SNS and a turn-off tube valve string A1-ANA. According to the test loop and the test method provided by the invention, the functions of the novel high-voltage direct-current power transmission hybrid converter are tested and verified under the test conditions of lower power and lower voltage, so that the operability, reliability and safety of the test are greatly enhanced; and test verification and research under various different complex working conditions can be flexibly realized, and high adjustability and flexibility are achieved.
Description
technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission testing, and in particular relates to a test circuit and a testing method for verifying the function of a high-voltage direct current transmission hybrid converter. Background technique [0002] The existing high-voltage direct current transmission technology (HVDC, High-Voltage Direct Current) is currently widely used due to its advantages of large transmission capacity, low loss, and high reliability. The commutation failure is one of the most likely faults in DC transmission systems. In the converter, if the valve that exits conduction fails to recover the blocking ability during a period of time when the reverse voltage is applied, or the commutation process is not completed during the reverse voltage, when the valve voltage becomes positive, The commutated valve will commutate to the valve originally scheduled to withdraw from conduction. This situation is ca...
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IPC IPC(8): G01R31/40G01R19/165G01R31/00
CPCG01R31/40G01R19/16538G01R31/00
Inventor 余占清许超群陈政宇赵彪曾嵘
Owner TSINGHUA UNIV