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Abstract
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With growing investment in power generation based on natural gas (NG), restrictions in gas transmission capabilities
are becoming increasingly related to the operational planning of electrical networks. Besides, the NG
system contingency can lead to the inaccessibility of NG power generation units and inevitably jeopardize power
system security. On the other hand, one of the significant challenges in the power system is the inadequacy or
disability of renewable energy sources (RESs) in providing primary frequency response. To address these
problems, we investigate the security-constrained joint expansion planning problem for the integrated power and
natural gas system (IPNGS) by appending novel constraints describing the simplified system frequency response.
An improved model of the frequency response is presented to find out the system minimum frequency in IPNGSs.
Also, we utilize the linearization technique in the model to have a novel formulation based on mixed-integer
linear programming (MILP). The model is robust against load demand and wind power uncertainties to guarantee
that the IPNGS can tolerate possible N 1 contingency events of the power transmission line or gas
pipeline. The results demonstrate that the proposed technique can be employed to IPNGS in the presence of RESs
without violating system frequency constraints.
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