Method for determining optimal equal length of direct-current transmission line physical simulation system
A DC transmission line, physical simulation technology, applied in the direction of design optimization/simulation, special data processing applications, etc., can solve problems such as inability to complete dynamic simulation, and achieve the effect of low economic cost
Pending Publication Date: 2022-01-04
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
We cannot fully dynamically simulate distributed elements of hundreds to thousands of kilometers
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[0047] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but these embodiments should not be construed as limiting the present invention.
[0048] The invention relates to a method for determining the optimal equivalent length of a direct current transmission line physical simulation system, in particular to a method for determining the optimal equivalent length of a direct current transmission line physical model that can accurately simulate the response characteristics in the frequency range from 0 Hz to thousands of hertz.
[0049] In fact, when a fault occurs on a DC transmission line, the protection algorithm of the DC transmission line generally uses low-frequency traveling wave protection and differential undervoltage protection formed by voltage and current sampling values in the range of 0 Hz to thousands of Hz to form the main protection of the line. Therefore, The focus of this invention i...
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The invention discloses a method for determining the optimal equivalent length of a direct-current transmission line physical simulation system. The method comprises the following steps: 1) determining an equivalent length l sample set of a pi-type physical simulation system of each direct-current transmission line; 2) calculating the difference between the equivalent input impedance of the direct-current power transmission line pi-type physical simulation system with the equivalent length of 1 under the specific frequency and the equivalent input impedance of the distributed parameter line; 3) calculating the difference between the equivalent input impedance of the direct-current transmission line pi-type physical simulation system with the equivalent length of 1 under the broadband response and the equivalent input impedance of the distributed parameter line; and 4) calculating the optimal equal length of the pi-type physical simulation system of the direct-current power transmission line under the broadband response. According to the method, the lowest economic cost of a physical simulation system can be ensured while the direct-current transmission line protection algorithm verification requirement can be met.
Description
technical field [0001] The present invention relates to the technical field of physical simulation of direct current transmission lines, in particular to a method for determining the optimal equivalent length of a physical simulation system for direct current transmission lines, in particular to a direct current transmission line that can accurately simulate the response characteristics of a frequency range from 0 Hz to thousands of hertz A method for determining the optimal equivalent length of a physical model. [0002] technical background [0003] The DC transmission line itself is a distributed component. In a general DC transmission system, the length of the transmission line ranges from hundreds of kilometers to thousands of kilometers. We cannot fully dynamically simulate distributed elements of hundreds to thousands of kilometers. Traditional line dynamic simulation components generally use the π equivalent model, and calculate the R, L, and C in the π equivalent mo...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 熊岩唐金锐周月宾饶宏许树楷朱喆
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD