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

A Cartesian coordinate, linear programming technology, applied in computing, AC networks with the same frequency from different sources, AC network circuits, etc., can solve the problems of interval estimation accuracy impact, unguaranteed convergence, and too conservative interval range.

Active Publication Date: 2017-09-26
SOUTH CHINA UNIV OF TECH
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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

Method used

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

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Embodiment

[0137] In order to facilitate the understanding of the present invention, the following description is made in conjunction with the accompanying drawings.

[0138] The modified IEEE30 node system is used for testing. The wiring diagram of the system is shown in the attached picture figure 1 The system has 24 transmission lines, 4 transformers, 2 reactive power compensation points, and 9 generator sets. The parameters are shown in Table 2. Among them, 3 are wind turbines, 1 is a balanced unit, and 24 load nodes. The output range of the three wind turbines is shown in Table 1 (Table 1 is the output parameter table of the wind turbines):

[0139]

[0140] Table 1

[0141] The calculation of all parameters adopts the standard unit system, and the reference power is 100M V·A.

[0142] The following specifically describes the algorithm steps of the power flow calculation in the rectangular coordinate interval:

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/38G06F19/00
CPCG16Z99/00H02J3/06H02J3/382H02J3/383H02J3/386Y02E10/56Y02E10/76
Inventor 张聪陈皓勇
Owner SOUTH CHINA UNIV OF TECH
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