A Multi-period Power Flow Optimization Method for Electric-Gas Interconnected Integrated Energy System

Abstract

Disclosed in the present invention is a multi-period power flow optimization method for an electricity-gas interconnection integrated energy system, said method comprising: (1) acquiring electricity-gas interconnection integrated energy system information; (2) according to said system information, constructing a multi-period scheduling model of an electricity-gas interconnection integrated energy system; (3) converting a non-linear non-convex equation of the natural gas pipe flow and pressure in the multi-period scheduling model of the electricity-gas interconnection integrated energy system into a natural gas power flow model in the form of enhanced second-order cone constraints; (4) calculating the converted multi-period scheduling model of the electricity-gas interconnection integrated energy system, so as to obtain an optimal solution; (5) using the optimal solution as an initial value, and using a DCP method to perform linearization iteration calculation on the converted multi-period scheduling model of the electricity-gas interconnection integrated energy system, until a natural gas system strictly satisfies power flow constraints; and (6) outputting a final solution at the end of the iteration as an optimal power flow solution in a future period. The present invention can effectively perform multi-period power flow optimization.

Description

technical field [0001] The invention relates to the technical field of electrical interconnection, in particular to a multi-period power flow optimization method for an electrical-gas interconnection integrated energy system. Background technique [0002] In view of the increase in the proportion of gas turbines on the power generation side and the application of power-to-gas technology in the power system, bidirectional energy flow between the power system and the natural gas system has become possible. The development of natural gas has transformed the power system and the natural gas system from mutual independence to mutual coupling (gradually developed into strong coupling). Therefore, it is necessary to break the existing mode of independent planning and operation of energy systems, and construct a unified integrated energy system that interconnects multiple heterogeneous energy sources. Furthermore, Energy Internet can be understood as the deep integration of Interne...

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Problems solved by technology

However, for the natural gas system, the existing power flow model linearization model adopts the piecewise linear method, which needs to introduce a large number of integer variables, which greatly increases the computational complexity. If a small number of piecewise integer variables are considered, the piecewise linear accuracy cannot meet the requirements of engineering practice.

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