Rectangular coordinate form interval power flow calculation method based on linear programming

Abstract

The invention discloses a rectangular coordinate form interval power flow calculation method based on linear programming. The method comprises the following steps of 1, establishing a rectangular coordinate form power flow equation, calculating an interval midpoint power flow solution, supposing an active power and a reactive power of a wind turbine generator set can be represented by intervals, establishing a power flow equation in a rectangular coordinate form, performing power flow calculation on the interval midpoint value, and obtaining a power flow solution; 2, estimating a fluctuation interval in which the power flow exists; 3, establishing a rectangular coordinate affine coordinate form of voltage; 4, calculating an affine coordinate form of the node power, introducing a voltage affine coordinate form into the rectangular coordinate trend equation, and obtaining an affine coordinate form of node power; and 5, compressing a power flow solution interval by means of linear programming. A linear program is constructed for respectively minimizing and maximizing a noise element, thereby obtaining a voltage real part and an imaginary part with shortest interval length.

Description

Technical field [0001] The present invention relates to a technique for solving power system interval power flow calculations, and in particular to an interval power flow calculation method based on linear programming in rectangular coordinate form. When the method involves solving interval power flow equations, the voltage phasor is expressed in rectangular coordinate form, and The affine arithmetic is used to transform the interval power flow equation problem under rectangular coordinates into the solution of the linear programming problem, and the upper and lower boundary areas of the interval power flow solution are obtained by solving the linear programming. Background technique [0002] After new energy units are integrated into the power grid, the uncertainty of their output causes frequent voltage fluctuations, posing a threat to the safe operation of the power grid. In order to analyze the impact of new energy output on grid power flow (mainly grid voltage), the traditio...

AI Technical Summary

Problems solved by technology

With the continuous development of modern power systems, the continuous expansion of the grid scale, and the access of more and more new energy sources, the traditional Monte Carlo method will greatly increase the number of samples, the scale of power flow calculations will also increase, and the calculation time Rapid growth, no longer suitable for analyzing the impact of new energy output on grid voltage

Therefore, new analysis methods need to be explored. Interval power flow analysis provides a new idea to solve this problem, but the estimated interval range is too conservative and the convergence is not guaranteed. The interval power flow method based on linear programming and affine arithmetic is very difficult. However, the power flow method in polar coordinates has interval calculations in non-affine forms such as trigonometric functions, which affects the estimation accuracy of intervals

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