Gas-electricity combined network steady-state load flow calculation method based on full-pure embedding method

Abstract

The invention discloses a gas-electricity combined network steady-state load flow calculation method based on a full-pure embedding method. The method comprises the following steps of inputting parameters and operation data of a power system and a natural gas system, using a full-pure function for representing unknown variables in a gas-electricity combined network power flow equation, constructing a gas-electricity combined network power flow equation containing a full-pure function and complex variables, calculating each unknown polynomial coefficient in the full-pure function, analyzing and continuating the full-pure function representing the unknown variable to obtain a numerical solution of the unknown variable, and substituting each unknown variable numerical solution into the power flow equation, checking whether the power flow constraint of the power system is met or not, if the constraint is met, outputting a gas-electricity combined network power flow solution, if the constraint is not met, increasing the series of the original full-pure function, and repeating the process until the constraint is met. According to the method, what is guaranteed is that calculation of the electric power system in the gas-electricity combined network has better convergence, the obtained solution must be a high-voltage solution, and the multi-solution problem of a common method is avoided.

Description

technical field [0001] The invention relates to the technical field of steady-state operation and analysis of a gas-power combined network, in particular to a method for calculating a steady-state power flow of a gas-power combined network based on a holomorphic embedding method. Background technique [0002] Due to the requirement for higher flexibility of the power system caused by the increase in the share of renewable energy, and the requirement to reduce pollution emissions in the power generation process, more and more natural gas generating units are connected to the power system. This deepens the coupling relationship between the power system and the natural gas system, and also makes the power system and the natural gas system often be controlled, optimized, and analyzed as a joint network (that is, "gas-electricity combined network"). The unified power flow calculation and analysis of the combined gas-power network can effectively obtain the operating status of the...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of the existing gas-power combined network power flow calculation technology, and provide a gas-power combined network power flow calculation method based on the holomorphic embedding method. By reconstructing the gas-power combined network power flow equation, using the Pure functions replace variables, solve unknown coefficients of holomorphic functions, and analytically extend holomorphic functions to achieve accurate and fast gas-power combined network power flow calculations

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