Emergency joint dispatching method and device for natural gas system and electric power system

Abstract

The invention discloses a natural gas system and power system emergency combined scheduling method and device, and the method comprises the steps: adjusting the output plan of each set when a power grid has a fault, checking the transmission limit value of the line power flow, carrying out the loop iteration till the transmission limit value of the line power flow is passed, and determining an output plan of a gas set; enabling a gas network side to carry out the checking of the total gas supply according to the output plan of the set, returning a checking result to the power grid side till the checking is passed, checking pipe network transmission of a natural gas system, and returning a result to the power grid side till the checking is passed; Enabling the gas network to check whether the total gas supply and a pipe network transmission system meet the demands of a gas turbine set when the gas network has a fault, and returning a checking result to the power grid for iteration till the total gas supply and the pipe network transmission system meet the demands of the gas turbine set; calculating an optimal scheduling plan of the natural gas system, and generating an emergency combined scheduling scheme.

Description

technical field [0001] The invention relates to the technical field of electric power dispatching automation, in particular to an emergency joint dispatching method and device for a natural gas system and an electric power system. Background technique [0002] In recent years, the installed capacity of natural gas units has increased day by day. The supply of natural gas will greatly affect the operation of gas units, and further affect the power generation and even the dispatching operation of the power system. It also reflects the coupling of natural gas networks and power networks. It is necessary to study the power - Scheduling and operation of combined gas system. When the power grid and gas network are jointly dispatched and operated, when the operating characteristics and respective constraints of the power grid and gas network affect their own operation, since the two networks are coupled through the gas turbine and the unique constraints, the operation change of one...

AI Technical Summary

Problems solved by technology

On the one hand, the failure of the gas network will not only affect the operation of the natural gas system, but also affect the operation of the power system through the gas-fired power plant

For example, the failure of gas network pipelines may lead to insufficient natural gas supply in gas-fired power plants, and may also cause the pressure of the pipelines at the entrance of gas-fired power plants to be too low, so that there is no gas available when power generation is required, which in turn leads to failures such as local voltage collapse and system instability in the power system

If timely and correct measures are not taken to eliminate the impact of faults, these faults are likely to develop into major faults such as power grid disconnection and protection chain tripping

On the other hand, failures in the electrical system may also affect the operation of the natural gas system

For example, the ground fault of the power line may cause the gas-fired power plant to trip and cut off, which will cause the gas load of the gas-fired power plant to drop from a large value to zero instantly

This will cause a sudden increase in the pressure of the natural gas pipeline at the entrance of the gas-fired power plant, which in turn will affect the pressure distribution of the entire natural gas pipeline network

If the pressure of the natural gas pipeline exceeds the threshold value, it may lead to the failure of the natural gas pipeline or the outage of the pressurization station along the line, which will cause more serious impact

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