Sensitivity Identification Method for Gas Pressure Weak Line of Integrated Electricity-Gas System Considering Static Gas Pressure Stability Limit

doi:10.12204/j.issn.1000-7229.2023.03.011

Abstract

Abstract:

In an integrated electricity-gas system (IEGS), the rapid growth in power and gas load has led to not only the voltage instability in power system, but also gas pressure drops in natural gas system. It further results in the instability in gas pressure and makes an impact on the security and stability of IEGS. Thus, it is necessary to find how power and gas load growth influences the gas pressure in IEGS. Draw on the idea of power system static sensitivity analysis and on the basis of the unified IEGS multi-energy flow model, this paper constructs two sensitivity matrixes for gas pressure-active load and gas pressure-gas load. The continuous multi-energy flow model is then used to calculate the sensitivity index of gas pressure-total load when the IEGS reaches the stability limit of gas pressure. The weak line of gas-pressure in IEGS can be located according to the index. Finally, results of a case study show the effectiveness of the proposed method in locating the gas pressure weak line of the IEGS.

Key words: integrated electricity-gas system (IEGS), continuous multi-energy flow, sensitivity index of gas pressure-total load, weak line identification

CLC Number:

TM73

NI Chouwei, ZHAO Bo, LIN Da, GUO Xiangwei, LIU Zhibin, MU Yunfei. Sensitivity Identification Method for Gas Pressure Weak Line of Integrated Electricity-Gas System Considering Static Gas Pressure Stability Limit[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(3): 105-112.

Figures/Tables 8

Fig.1 Algorithm flow of identifying weak links of IEGS in critical state of gas-pressure static stability based on sensitivity index

Fig.2 Topology of the IEGS

Table 1 Node loads of natural gas system

Table 2 Pipeline parameters of natural gas system

Fig.3 Initial value Sg,0 and node pressure of IEGS

Fig.4 Sg,max and node pressure under static gas-pressure stability critical point in case 1

Fig.5 Sg,max and node pressure under static gas-pressure stability critical point in case 2

Fig.6 Node Sg (ratio)-λ curves of IEGS

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