A DC system reliability assessment method considering the influence of substation power consumption

Abstract

The invention relates to a direct current system reliability evaluation method taking station service power influence into account. The direct current system reliability evaluation method includes the steps: 1) drawing a fault tree graph for a station service power system according to the basic theory of fault tree analysis; 2) performing reliability modeling for the station service power system by the aid of fault tree analysis; 3) dividing the whole system into six subsystems including a converter bridge subsystem, a converter transformer subsystem, a control protection subsystem, an alternating current filter subsystem, a polar equipment subsystem and a station service power subsystem; 4) building state space graphs and equivalent models of the subsystems by a frequency and duration method according to the Markov theory; 5) successively combining the equivalent models of the subsystems according to a certain relation to finally obtain the state space graph of the whole high voltage direct current transmission system; 6) calculating practical case data by the method, comparing the calculation result with a calculation result of a traditional method and verifying effectiveness of the method. By the direct current system reliability evaluation method, reliability evaluation results of the direct current system are more accurate.

Description

technical field [0001] The invention is a DC system reliability evaluation method considering the influence of station power consumption, which belongs to the innovative technology of the DC system reliability evaluation method considering the influence of station power consumption. Background technique [0002] For a long time, DC system reliability assessment methods are divided into two categories, namely analytical method and simulation method. The analytical method is to establish a mathematical model of system reliability based on the random parameters of the power system components, and obtain various indicators of the system through numerical calculation methods; the simulation method is to use the corresponding random number parameters of each component in the system on the computer It means that the actual situation of the system is simulated on the computer, and the required indicators are estimated according to the observation of the simulation process for a cert...

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Problems solved by technology

However, in the actual DC system, if the power system of the station fails, it will often directly lead to the failure of the power supply and stop the DC system.

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