Direct current converter valve low voltage parameter operation test method

Abstract

This invention discloses the running test method of the low-voltage parameter in DC-exchange current valve. It is in the field of electric power electron and electric power system. It is connected tothe high-voltage low current source loop. In the time of an experimental cycle T, the pulse triggering time flow is as below progresses: in phase of t0-t1, according to the request of the experiment,it controls the triggering angle alpha of 6 pulse bridge; At the time of t1,it touches off VT and V1 to induct high-current semi wave direct current; At the time of t2, the semi-wave current from low-voltage high-current supply is over zero,V1 begins to close; in the phase t2-t3,V1 is closed, the low current of VT valve arm keeps on passing the sample; At the time of t3, VT is closed because of the zero current, high voltage low current supply loop offers the necessary voltage of sample valve. The test method makes the open voltage and the cut resuming-step voltage equivalent accurately. The equivalence rate of the experiment is in a quite high level and it can even finish the least alternating current voltage test, transient undertension test and interrupted DC current test.

Description

technical field [0001] The invention belongs to the field of power electronics and power systems, and in particular relates to a method for operating a DC converter valve with low-voltage parameters Background technique [0002] Compared with AC transmission, DC transmission has incomparable advantages in long-distance large-capacity power transmission, asynchronous networking DC cable power transmission, etc. The cost of long-distance large-capacity power transmission is lower than that of AC, and asynchronous networking can not increase the short circuit of the system. Capacity, DC cable power transmission capacity is not limited by distance, and DC converter valve is the core and key equipment of DC power transmission, ensuring its safe, reliable and stable operation is not only the requirement of the system for the device, but also the protection of the device itself Require. The operation test is an important means to test the performance of the valve. At present, due...

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is that for the low-voltage parameter test of the DC converter valve, the existing synthetic test method cannot be equivalent to the high recovery step voltage, the high trigger voltage and the current change at the turn-off time rate, temperature gradient and many other deficiencies, it is necessary to change the test method

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