Calculation method for safety constraint optimal energy flow of electricity-gas mixing system

Abstract

The invention discloses a calculation method for the safety constraint optimal energy flow of an electricity-gas mixing system. The method comprises firstly considers the coupling of gas generator andthe motor-driven compressor in the electric-gas hybrid energy system, and establishes the optimal energy flow calculation model for the safety constraint of the electric-gas hybrid system.. The modeltakes the total operation cost of a hybrid system, namely the sum of the coal consumption cost of a coal-fired power generation unit and the natural gas consumption cost of a natural gas network froma gas source as an objective function; Considering the safety constraints of multiple N-1 faults in a power system and a natural gas system, the optimization model is solved to obtain the optimal energy flow state of the power system and natural gas system satisfying each N-1 fault safety constraint, so that it can be better The ground meets the requirements for safe operation under various possible failures.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for calculating optimal energy flow with safety constraints in an electric-gas hybrid system Background technique [0002] The integrated power and gas energy systems (IPGES) composed of electric power system and natural gas system is an important way for human society to develop a more environmentally friendly and efficient energy system. The optimal power flow (OPF) calculation of traditional power systems generally does not consider the operation of the natural gas network, that is, it is assumed that the natural gas supply of gas-fired generators is sufficient; in fact, the natural gas network is subject to constraints such as gas storage capacity, pipeline capacity, and pressure. The operating state will affect the stable operation of the power system to a certain extent. Therefore, it is necessary to uniformly model the optimal energy flow of the electric-...

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Problems solved by technology

Existing studies on the optimal energy flow calculation of electric-gas hybrid systems rarely consider the safety constraints of multiple N-1 faults in natural gas systems and electric power systems, and do not take into account the various possible occurrences in electric power systems and natural gas systems The influence of N-1 faults on the optimal operation of the hybrid system, the obtained operating state of the hybrid system cannot meet the safe operation requirements under various possible faults

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