Severity Heat Mapping for Power System Security Assessment with N-2 Contingency Analysis

Abstract

This research presents severity heat mapping for a power system security assessment with N-2 contingency analysis. The severity heat map considered the number of devices that exceeded the violation limit for power systems. This study used Thailand's power system in 2019 as the research base, while the Powerworld program was used to simulate and analyze the results. The study considered four cases. The first was the number of devices that exceeded the violation limit, while the second case was the percentage of the maximum branch. The third case was the voltage drops below the controlled value and the last case was the voltage greater than the controlled value. This research focused on studying the stability of the power system in the central region of Thailand, which has the largest difference in load and generation capacity. The results of the N-2 contingency analysis considered the cases of two generators that experienced outages in the system. The results showed that a severity heat map could indicate the devices that could cause an impact or severity on power system stability in each case. Power flow congestion management may then be used to enhance power system stability.