Load margin calculation method and system for electrical coupling system based on continuous multi-energy flow

Abstract

The invention discloses a load margin calculation method and system for an electrical coupling system based on continuous multi-energy flow. The conventional load margin calculation does not consider the primary energy supply of a gas generator set and the operation constraint of a natural gas system. The technical scheme comprises the following steps: establishing a multi-energy flow model considering the safety constraint of the electrical coupling system, including the multi-energy flow model of the natural gas system, a power system and the gas generator set; and proposing a continuous multi-energy flow calculation method to solve the relation curve between the node pressure of a gas network, the node voltage of a power network and the load margin based on the continuous power flow and the load growth parameters so as to calculate the system load margin. According to the method, the load margin of the electrical coupling system can be determined and the influence of the safety constraint of the natural gas system on the load margin can be analyzed so as to provide the reference for adjustment of the operation state of the natural gas system and have an important significance for the online evaluation of the system static stability and is helpful for the system dispatcher to monitor the operation stability of the system.

Description

technical field [0001] The invention belongs to the technical field of power system voltage stability index optimization, and in particular relates to a load margin calculation method and system for an electrical coupling system based on continuous multi-energy flow. Background technique [0002] In recent years, the share of natural gas-fired units (NGUs) in the power system has been continuously increasing due to their good economy, fast adjustment ability and low pollution emission characteristics. With the rapid increase of the power generation share of gas-fired units, electric power systems (EPSs) and natural gas systems (NGSs) have gradually formed a unified integrated system-electrically coupled system (IEGS). Therefore, as the coupling becomes tighter, the interaction effects between different energy supply systems should be closely monitored. [0003] At present, relevant research work on IEGS has been carried out at home and abroad: some studies use P2G technolog...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method and system for calculating the load margin of an electrical coupling system based on continuous multi-energy flow, so as to solve the problem that the traditional load margin calculation does not consider the primary energy supply of NGU and the operating constraints of the natural gas system. Improper problem, realize accurate calculation of power system load margin under the background of deep coupling of power system and natural gas system, to optimize online evaluation of system static stability, and improve the ability of static stability analysis of electrical coupling system

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