Abstract
The analysis of the fault propagation path of transmission lines and the method of identification of vulnerable lines during typhoon weather conditions is of great significance. In this context, this paper introduces the failure probability model of transmission lines under such conditions by considering both wind speed and the load of the lines. The Monte Carlo simulation (MCS) and the DC model based on OPA are applied to simulate the failure of transmission lines. The cascading failure state transition diagram (CFSTD) is proposed based on the failure chains and the criticality ranking of nodes in CFSTD by the average weight coefficient (AWC) for identifying vulnerable lines of the power grid under such conditions. A new weight in CFSTD is proposed to describe the vulnerability of each line and a new resilience index is used to assess the impacts of a typhoon on the system. The proposed method is demonstrated by using the modified IEEE 118-bus test system. Results show that the method proposed in this paper can simulate the fault propagation path, and identify the critical components of power grid under a typhoon.
Highlights
The frequency and perniciousness of extreme weather events around the world have increased dramatically in recent years because of climate change [1]
The proposed method for modeling the performance and identifying vulnerable components of a power system under a typhoon is shown Figure 1. This framework includes the typhoon impacts model, which calculates the failure probability of lines based on wind speed and power flow, a cascading failure model, which applies the Monte Carlo simulation (MCS) and the DC model based on OPA to simulate the operation of the grid, and the vulnerability assessment model, which builds the cascading failure state transition diagram (CFSTD) for identifying the critical lines
The failure probability of transmission lines are obtained by considering the wind speed and power flow, and applying the MCS and DC model based on OPA to simulate the operation of the power system affected by Typhoon Usagi
Summary
The frequency and perniciousness of extreme weather events around the world have increased dramatically in recent years because of climate change [1]. The strong wind caused great power outages in Texas lasting over two weeks [2] This clearly highlights the importance to study the mechanism of the impacts on power systems under extreme events, understand failure forms, and identify the vulnerability of power systems in extreme weather to enhance their resilience. The traversing method, is limited because it takes much time and computing resources to identify the vulnerable lines in large-scale networks These studies mainly focus on the consequences of extreme events on the systems and ignore the failure development process.
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