A Calculation Method of Short-Circuit Current in Power System Containing a Large Number of Fans
A short-circuit current and power system technology, applied in the direction of measuring current/voltage, measuring only current, measuring electrical variables, etc., can solve the problems of increasing time consumption, increasing computer storage and computing overhead, system node dimension, and admittance matrix storage Space number matrix inverse complexity expansion and other issues, to avoid the effect of increase
Inactive Publication Date: 2018-07-06
SHAANXI REGIONAL ELECTRIC POWER GROUP +1
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And the inverse operation Y of the nodal admittance matrix Y -1 The complexity ranges from o(N AC 3 ) increased to o((N AC +F) 3 ), the time consumption also increases
[0015] If we further consider that multiple wind farms are connected to the system, then the system node dimension, the number of admittance matrix storage space, and the complexity of matrix inversion will be further expanded, thereby greatly increasing the computer storage and calculation overhead
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[0049]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0050] The purpose of this invention is to provide a kind of calculating method that contains the electric system short-circuit current of a large number of wind turbines according to the feeder L ij Determine the equivalent circuit of the circuit after connecting N wind turbines, and then determine the feeder L ij Middle branch voltage The general solution, according to the branch voltage The general solution to determine the feeder L ij The contribution ...
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The invention discloses a calculation method for short circuit current of a power system containing a large number of draught fans. The calculation method comprises steps of determining an equivalent circuit according to a circuit where N draught fans are connected to a feeder line L<ij>, wherein the equivalent circuit is divided into N+1 segments of lines and each line is connected to an equivalent resistor, determining a general solution of a branch voltage V<.>n of the feeder line L<ij> according to the equivalent circuit, determining contributions of diagonal elements and non-diagonal elements of a pair node admittance matrix of the feeder line according to the general solution of the branch voltage V<.>n, traversing all feeder lines in the power system, determining a node admittance matrix Y according to the contributions of the diagonal elements and the non-diagonal elements of the feeder line pair node admittance matrix, determining a node impedance matrix Z according to the node admittance matrix Y, and determining short circuit current i<i-j> of the feeder line L<ij> according to the node impedance matrix Z. The calculation method for short circuit current of a power system containing a large number of draught fans can avoid the fact that the dimensions of the node admittance matrix are increased along the increase of the connected draught fans.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a calculation method for the short-circuit current of a power system containing a large number of fans. Background technique [0002] The large-scale development and utilization of wind power will have a significant impact on power system operation, control, protection, stability analysis and other aspects. After a large number of wind turbines are connected to the power system, the short-circuit current distribution of the power system may be significantly changed. In order to analyze the impact of wind turbine access on the short-circuit current of the power system, it is necessary to calculate the short-circuit current of the power system with wind turbines. [0003] Among them, the calculation method of short-circuit current includes (assuming that the fault occurs at the fth node): [0004] The current flowing from the fth node into the short-circuit point after the ...
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IPC IPC(8): G01R19/00
CPCG01R19/0092
Inventor 孙毅卫汪雨辰李珂陈西平陈来军黄少伟王志文王召健唐可翾
Owner SHAANXI REGIONAL ELECTRIC POWER GROUP