Method of three-phase unbalance load flow calculation based on complex affine mathematical theory

Abstract

The invention discloses a method of three-phase unbalance load flow calculation based on the complex affine mathematical theory. The method includes inputting network original parameters including impedance values of each line and transformers, and active power and reactive power of each load node phase; initializing amplitude values and phase angles of each load node phase voltage; setting zero of iteration; calculating each phase injected current complex affine vector of each load node; starting from an end load node, performing summation calculation of branch current, and acquiring starting current complex affine values of each phase of each branch; and utilizing a set original load node voltage as a boundary condition to calculate voltage drop of each phase of each branch and end voltage complex affine values. By the method compared with the prior art, effective optimization of an uncertain load flow calculation interval algorithm is provided, interval load flow result conservative property, defects of an interval method are overcome, load flow of a distribution network containing uncertain information can be figured out effectively, and conservative property in the process of interval load flow calculation can be solved.

Description

technical field [0001] The invention relates to the field of power system power flow analysis, in particular to a calculation method for three-phase unbalanced power flow of a power distribution network based on complex affine mathematical theory. Background technique [0002] With the emergence of the electricity market and the access of distributed power sources, there will be a large number of uncertain factors in the actual operation of the power distribution system, such as the uncertainty of distributed power output, the uncertainty of changing loads, and the model parameters of power components. uncertainty, etc. On the one hand, the traditional deterministic power flow calculation methods show certain limitations when analyzing and calculating systems with uncertain information. On the other hand, uncertain power flow calculations have been used in some applications in power system planning. However, due to the difficulty of the problem itself, the calculation of un...

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Problems solved by technology

On the one hand, traditional deterministic power flow calculation methods show certain limitations when analyzing and calculating systems with uncertain information

On the other hand, uncertain power flow calculations have been used in some applications in power system planning. However, due to the difficulty of the problem itself, the calculation of uncertain power flow algorithms will be too large. These two problems have always been in power flow calculations the difficulty

[0004] When the interval algorithm is used to obtain an approximate solution, the problem of interval conservatism will appear, that is, due to the improper choice in the calculation process, the interval range is too large, making the power flow calculation results meaningless

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