Calculation method of single-phase multi-feed-in interaction effect factor based on impedance matrix

Abstract

The invention discloses a calculation method of a single-phase multi-feed-in interaction effect factor based on an impedance matrix, comprising steps of determining a DC converter station to be studied by taking a receiving terminal of the multi-feed-in AC power grid and presuming that the quantity of the DC converter station is N, (2) calculating self-impedance Zii-1, Zii-2, Zii-0 of a converter station i in a positive negative zero sequence impedance matrix of the multi-feed-in AC-DC power grid to be studied and the mutual impedance Zij-1, Zij-2, Zij-0,i=1,2-N, j=1,2-N between the converter station i and the converter station j,calculating the positive-negative zero sequence impedance of the converter station and the sum of the positive-negative zero sequence impedance between the converter station I and the converter station j, and (3) calculating the single-phase multi-feed-in interaction effect factor SMIIFij of the converter station I and the converter station j. The invention can quickly obtain the single-phase multi-feed-in interaction effect factor SMIT between the converter station, and can provide reference to the strongness and weakness.

Description

technical field [0001] The invention proposes a calculation method of a single-phase multi-infeed interaction factor based on an impedance matrix, which belongs to the technical field of power system analysis. Background technique [0002] Multi-infeed DC transmission system means that multiple DCs are centrally connected to the same AC grid. With the continuous development of the power system, new features such as AC-DC parallel operation and multi-circuit DC centralized feed-in have appeared in the power grid. The multi-circuit DC systems are closely connected and interact with each other, and the stability characteristics are complex. Using quantitative indicators can clearly indicate the closeness of the connection between each circuit of DC systems. [0003] The CIGRE WG B4 working group once proposed an index to measure the strength of the interaction between converter stations in the multi-infeed HVDC transmission system - multi-infeed interaction factor (MIIF), which...

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Problems solved by technology

However, this method needs to constantly try different grounding short-circuit impedance values ​​to obtain the situation that the A-phase voltage of converter station i drops by 1%, which requires a large amount of work. If there are many converter stations in the system, The calculation time will be longer, therefore, it is necessary to propose a simple and fast calculation method to determine the single-phase multi-infeed interaction factor SMIIF between different converter stations

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