Method and system for simulating maximum switching current of multi-terminal DC system
A technology for converting current and multi-terminal DC, which is applied in design optimization/simulation, special data processing applications, etc., and can solve problems such as the inability to quickly determine the calculated value of the maximum conversion current
Active Publication Date: 2021-04-16
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0005] Based on this, it is necessary to provide a method and system for simulating the maximum conversion current of a multi-terminal DC system in view of the fact that the determination process of the traditional multi-terminal DC maximum conversion current is relatively complicated, and the calculation value of the maximum conversion current suitable for engineering applications cannot be quickly determined.
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[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0028] Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted.
[0029] The invention can be applied to the technical field of electric power, especially the conversion current calculation in the multi-terminal DC power transmission project.
[0030] figure 1 It is a schematic flowchart of a method for simulating the maximum switching current of a multi-terminal DC system...
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The present invention relates to a method and system for simulating the maximum conversion current of a multi-terminal direct current system. The above method includes the steps of: determining a first calculation model of the conversion current of the multi-terminal DC system and the resistance value range of each variable resistor according to system conditions; selecting the variable resistors according to the resistance value range of each variable resistor A plurality of resistance values of the resistor are respectively calculated through the first calculation model to obtain a plurality of corresponding conversion current values; the maximum value is determined from the plurality of conversion current values as the approximate value of the maximum conversion current of the multi-terminal DC; A random calculation error is obtained from the exact value of the maximum conversion current and the approximate value of the maximum conversion current of the two-terminal DC; the error correction is performed on the approximate value of the maximum conversion current of the multi-terminal DC according to the random calculation error, and the simulation value of the maximum conversion current of the multi-terminal DC system is obtained. Through the solution of the present invention, the calculated value of the maximum conversion current suitable for engineering applications can be quickly determined.
Description
technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a method and system for simulating the maximum conversion current of a multi-terminal direct current system. Background technique [0002] In the process of system research and complete design of DC transmission projects, it is necessary to calculate the maximum value of the transfer switch, such as the earth return transfer switch ERTB and the metal return transfer switch MRTB, so as to give the reference value of the corresponding switch parameters and guide the equipment production. [0003] The conversion current calculation in the traditional multi-terminal DC transmission project involves multi-circuit DC impedance, the conversion current expression is relatively complicated, and the occurrence condition of the maximum conversion current value is difficult to determine. To obtain the exact value of the maximum conversion current, it needs to be determin...
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IPC IPC(8): G06F30/20
CPCG06F30/367
Inventor 郭龙黄莹赵晓斌卢毓欣侯婷李凌飞辛清明张祖安徐迪臻
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD