Piecewise linearization optimal power flow calculation method for electricity-gas coupling system

Abstract

The invention discloses a piecewise linearization optimal power flow calculation method for an electricity-gas coupling system. The method comprises the steps: 1, acquiring basic parameters of a circuit element and a natural gas network element in the electricity-gas coupling system; 2, according to a fuel cost linear piecewise number Ne, converting a nonlinear original function of the thermal power generating unit fuel cost related to unit output into a linear function through employing a piecewise linearization method; 3, according to the node pressure linear piecewise number Lseg of the natural gas network, converting a nonlinear original function of natural gas network pipeline flow related to node pressure into a convex linear combination form through employing the piecewise linearization method; 4, establishing an optimal power flow model of the electricity-gas coupling system based on mixed integer linear programming; 5, solving the optimal power flow model by adopting linear programming. According to the method, the non-convex nonlinear problem can be converted into the convex linear problem, linear programming is adopted for solving, and the calculation speed is increased;and the safety of the power grid and the natural gas network is ensured, and the overall optimal economic operation can be realized.

Description

technical field [0001] The invention belongs to the field of optimal power flow calculation of an electric-pneumatic coupling system, and in particular relates to a piecewise linearized optimal power flow calculation method of an electric-pneumatic coupling system. Background technique [0002] Optimal Power Flow (Optimal Power Flow) is an important tool for system operation and planning. Traditional OPF generally only conducts optimization analysis on power systems without considering multi-energy coupling links. The electric-gas coupling system uses the gas generator as the coupling element. With the continuous increase of the installed capacity of the gas generator, it is no longer possible to ignore the influence of the operating state of the natural gas network when analyzing the optimal power flow of the power system. Therefore, in actual engineering, the effective solution and analysis of the optimal power flow of the electric-pneumatic coupling system is of great sig...

AI Technical Summary

Problems solved by technology

The traditional piecewise linearization method of the optimal power flow of the electric-pneumatic coupled system relies on the selection of the initial operating point of the system. If the initial value is not selected properly, it is easy to cause inaccurate calculation results of the optimal power flow.

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