Direct current transmission line fault simulation method and device based on PSS/E

Abstract

The invention discloses a PSS / E-based DC power transmission line fault simulation method and device. The method comprises the steps of building a T-shaped equivalent circuit model of a DC power transmission line in PSS / E; selecting a fault branch and judging whether the fault branch is enabled or not; if the fault branch is enabled, obtaining a derivative of current to time in the smoothing reactor and the reactance of the direct current transmission line according to a loop formed by the fault branch and the T-shaped equivalent circuit and a pre-selected current positive direction so as to obtain a current value in the direct current transmission line; and if the fault branch is not enabled, respectively calculating current-to-time derivatives in the smoothing reactor according to the T-shaped equivalent circuit and a pre-selected current positive direction so as to obtain a current value in the direct current transmission line. A T-shaped equivalent circuit is built, a fault branch is selected, the current of each branch is calculated according to a loop formed by the T-shaped equivalent circuit and the fault branch, calculation of direct current and direct current voltage is accurately simulated, and technical support is provided for system research and stable operation.

Description

technical field [0001] The invention relates to the technical field of power system simulation, in particular to a PSS / E-based DC transmission line fault simulation method and device. Background technique [0002] Although the development and application of high-voltage direct current transmission technology has solved the problem of unbalanced distribution of energy and power loads, with the commissioning of more direct current projects and the increase of transmission distance, direct current transmission lines are facing more and more problems. Factors including man-made accidents, differences in geographical environment, and natural force majeure may damage the transmission line, posing a huge threat to the safe operation of the power system. [0003] Faced with many problems, the simulation of DC line faults is very important and indispensable in joint commissioning tests and safety and stability calculations of DC projects. None of the existing DC models provided by P...

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Problems solved by technology

When simulating the DC line fault restart function through the manual switching method of unlocking-locking-unlocking, on the one hand, the operation is complicated, and the tester must also have a full understanding of the timing of the restart logic; on the other hand, through the manual switching method During the simulation, only the impact of the DC model on the AC network can be studied, and it cannot accurately reflect the electrical quantity changes of the DC model during the restart process.

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