Testing method for dynamic inductance of saturable reactor of direct-current converter valve

A technology of DC converter valve and dynamic inductance, which is applied in the direction of measuring resistance/reactance/impedance, instruments, measuring devices, etc., to achieve the effect of simple equipment, easy operation, and reduction of calculation complexity and numerical errors

Active Publication Date: 2012-10-24
STATE GRID CORP OF CHINA +2
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  • Claims
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Problems solved by technology

From the physical definition of dynamic inductance, the dynamic performance of a saturable reactor is mainly determined by the voltage and current characteristics at both ends, but in the actual physical entity, the iron

Method used

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  • Testing method for dynamic inductance of saturable reactor of direct-current converter valve
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  • Testing method for dynamic inductance of saturable reactor of direct-current converter valve

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Embodiment

[0087] By adopting the test method for the dynamic inductance of the saturated reactor of the DC converter valve provided by the present invention, the dynamic inductance of an actual saturated reactor is tested and calculated. Saturable reactor parameters are as follows: magnetic circuit length l m 0.5m, core logarithm n is 9, core filling factor k c is 0.9, the number of turns N of the iron core coil is 4, and the geometric cross-sectional area of ​​the iron core is A c It is 30mm×50mm. The flow chart of the testing process is as follows figure 2 As shown, the schematic diagram of the dynamic inductance normalization result of the specific embodiment is as follows image 3 shown by image 3 It can be seen that the dynamic inductance changes with the current of the dynamic inductance branch of the iron core. When the current of the saturated reactor is small, the dynamic inductance of the iron core is larger, about 0.9mH. With the increase of the current, the dynamic ind...

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Abstract

The invention relates to a testing method for dynamic inductance, and in particular relates to the testing method for the dynamic inductance of a saturable reactor of a direct-current converter valve. The testing method comprises the following steps of: A. setting up a testing circuit of the saturable reactor; B. testing the voltage of a dynamic inductance end of an iron core of the saturable reactor; C. applying low frequency sinusoidal steady state excitation to the saturable reactor; D. testing the electric current of a dynamic inductance branch of the iron core; E. determining the electromagnetic parameter of the dynamic inductance of the iron core; and F. determining the dynamic inductance of the iron core. According to the testing method, the circuit characteristic measurement for determining the dynamic inductance of the iron core is converted into a electromagnetic field parameter through strict test and calculation on the basis of the dynamic inductance definition, thereby reducing the computational complexity and numerical errors; the physical property of the dynamic inductance is expressed by adopting the parameter of the port of the saturable reactor through a reasonable physical hypothesis, thereby avoiding the direct measurement on the parameters of the two ends of the dynamic inductance and greatly reducing the test complexity; and equipment needed for tests is simple and frequently-used; and the test process is easy to operate.

Description

technical field [0001] The invention relates to a testing method for dynamic inductance, in particular to a testing method for dynamic inductance of a DC converter valve saturated reactor. Background technique [0002] The saturable reactor is an important protection element in the DC transmission converter valve, which is composed of an iron core and a coil. At the initial stage of the converter valve opening, the saturable reactor has the function of delaying the current rising rate and protecting the thyristor. This process generally only takes a few microseconds, and the saturable reactor appears as a dynamic inductance during this process. [0003] The iron core and the coil interlink constitute the dynamic inductance of the saturable reactor, denoted as L m There are hysteresis loss and eddy current loss in the iron core during operation. At both ends of the iron core of the saturable reactor, as the excitation current rises, the iron core tends to be saturated. At th...

Claims

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Application Information

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IPC IPC(8): G01R27/26
Inventor 刘杰高冲魏晓光赵贺曹均正
Owner STATE GRID CORP OF CHINA
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