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A data-driven linear solution method for power grid power flow equation

A power flow equation and data-driven technology, applied to AC networks, circuit devices, and AC network circuits with the same frequency from different sources, can solve problems such as large generalization errors of equations and difficulty in adapting to collinearity, and achieve real-time scheduling , Reduce the amount of calculation, the effect of high calculation accuracy

Active Publication Date: 2019-09-27
TSINGHUA UNIV
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Problems solved by technology

However, the classic least squares regression method is difficult to adapt to the collinearity characteristics in the power grid data, and the generalization error of the regression equation is large

Method used

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  • A data-driven linear solution method for power grid power flow equation
  • A data-driven linear solution method for power grid power flow equation
  • A data-driven linear solution method for power grid power flow equation

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Embodiment

[0101] The present invention is based on the NREL-118 test system in I.Pena, C.Brancucci and B.M.Hodge, "An Extended IEEE 118-busTest System with High Renewable Penetration," IEEE Trans.Power Syst., p.1-1, 2017 The provided load data and grid data are taken as an example to verify the vision of the method proposed by the present invention. The active load data is simulated based on the weather and load data from 1980 to 2012. The reactive load data is obtained by multiplying the active load value with a randomly generated multiplier, and the value of the multiplier is between [0.15-0.25]. In this example, a total of 300 sets of data are taken for training, and 300 sets of data are used for testing.

[0102] Calculate the power flow according to the linearized power grid power flow equation obtained by the method proposed by the present invention, and compare it with the accurate calculation result of the AC power flow, the result is as follows figure 1 with figure 2 shown....

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Abstract

The present invention relates to the field of grid power flow calculation and the technical field of data driving, and provides a data driving-based grid power flow equation linearization and solving method. The method comprises: first establishing mapping equations from active power injection and reactive power injection to voltage phase angle and voltage amplitude according to node types of nodes of a power system, and then listing calculation expressions of power flow equation solutions according to the relations between known and unknown quantities of the node types; and proposing, according to data such as the active power injection, reactive power injection, voltage amplitude, and voltage phase angle in historical measurement data of the grid, a Bayesian linear regression method for grid power flow equation linearization in which a grid data colinearity characteristic is considered, so as to obtain the solution of a linearized power flow equation. The present invention can improve the precision of grid power flow equation calculation and facilitate reducing grid operation costs. In addition, the present invention reduces the calculation amount, improves the calculation flexibility, and better accords with the actual situations of the power system in engineering application.

Description

technical field [0001] The invention belongs to the field of grid power flow calculation and the field of data-driven technology, and in particular relates to a data-driven linear solution method for power grid power flow equations. Background technique [0002] Grid power flow calculation is the basis of power system optimization and analysis. The power flow equation is strongly nonlinear, which increases the complexity of the optimization and control algorithm of the power grid and deteriorates the convergence. The linearization of the power flow equation can significantly simplify the computational complexity and ensure convergence, so it is also widely used in the algorithms of power system control, dispatch and power market clearing. The existing linearization methods for power flow equations are based on physical models. That is, starting from the original AC power flow equation, based on the characteristics of the power grid operation state, such as the voltage phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20Y02E60/00Y04S40/20
Inventor 刘羽霄张宁王毅杨经纬康重庆
Owner TSINGHUA UNIV
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