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Voltage stability margin calculation method considering electricity-gas coupling system constraint

A technology of voltage stability margin and calculation method, which is applied in the field of voltage stability margin calculation and can solve problems such as limitations

Active Publication Date: 2018-10-16
TSINGHUA UNIV
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Problems solved by technology

Therefore, the gas supply of the power system is limited by the pipeline transmission capacity of the natural gas system and other natural gas loads, and the calculation method that only considers the voltage stability margin constrained by the power system is no longer applicable. Calculation Method of Power System Voltage Stability Margin with Coupled System Constraints

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  • Voltage stability margin calculation method considering electricity-gas coupling system constraint
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  • Voltage stability margin calculation method considering electricity-gas coupling system constraint

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Embodiment Construction

[0048] The calculation method of the voltage stability margin considering the constraints of the electric-pneumatic coupling system proposed by the present invention comprises the following steps:

[0049] (1) Establish the equation constraint equation for the steady-state safe operation of the electric-pneumatic coupling system, including:

[0050] (1-1) The power flow equation of the power system in an electric-pneumatic coupling system is as follows:

[0051]

[0052] Among them, P Gi is the injected active power of the i-th node in the power system, P Li is the injected active power of the i-th node in the power system, Q Gi is the injected reactive power of the i-th node in the power system, Q Li is the injected reactive power of the i-th node in the power system, V i , V j are the voltage amplitudes of the i-th node and the j-th node in the power system, θ i , θ j are the voltage phase angles of the i-th node and the j-th node in the power system, G ij is the ...

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Abstract

The invention relates to a voltage stability margin calculation method considering electricity-gas coupling system constraint, and belongs to the technical field of safety analysis and estimation considering multi-energy flow coupling characteristic in a power system. By the voltage stability margin calculation method, tight coupling of the power system and a natural gas system is fully considered, and the voltage stability margin of the power system in the coupling system is solved out; on one hand, the influence of safety and capacity constraint of the natural gas system on the power systemis fully considered; and on the other hand, the influence of dependency between a power load and natural gas load on the voltage stability margin according to actual condition of an application placeis also considered, and the situation that a calculation result caused by purely considering the constraint of the power system in a traditional calculation method is excessively optimistic is prevented. The method can be used in running risk analysis of the power system, a risk estimation index is provided for a running manager of the power system, a potential risk is favorably reduced, and the running safety of the system is improved.

Description

technical field [0001] The invention relates to a voltage stability margin calculation method considering constraints of an electric-pneumatic coupling system, and belongs to the technical field of safety analysis and evaluation considering multi-energy flow coupling characteristics in a power system. Background technique [0002] Due to the low cost of gas generators, less destructive power to the environment, fast response, and short construction period of gas stations, natural gas has become an important part of power supply energy worldwide. Therefore, with the increasing proportion of natural gas in the primary energy supply of the power system, the reliable supply of natural gas plays a vital role in the safety of the power system. [0003] However, unlike coal and other energy sources that can be stored on a large scale, natural gas is supplied mostly through pipelines for long-distance transmission. On the one hand, due to pressure safety constraints, the flow of na...

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20G06Q50/06G06F30/20G06F2113/04G06F2119/06H02J3/1821Y02E40/30Y02E60/00Y04S10/50Y04S40/20G06F2111/04G06F2111/10G06F2113/08H02J3/381
Inventor 孙宏斌郭庆来王彬乔铮张伯明吴文传张明晔
Owner TSINGHUA UNIV
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