Analogue simulation and practical application effect analysis of relay protection strategy of power system in high altitude area
Haifeng Ma, Yuan Li, Baocai Qi, Guochao Zhu, Zhipeng Tuo, Fengjun HanAbstract
As a safety protection measure in power systems, relay protection can quickly and accurately determine the type of fault and its cause. In order to adapt to the increasingly complex operating environment of relay protection systems in high-altitude areas, a relay protection strategy based on EMD-GA-ELM is proposed. The strategy preprocesses the multi-source data using the EMD algorithm, trains the data using the ELM model, and optimizes the overall parameters using the parallel search function of the GA algorithm, enhanced by PSO. Through simulation and practical application, it is found that the AUPR scores of this paper’s relay protection strategy for different scenarios are above 0.9, and the running time is reduced by 35.94% to 60.60%, which has better fault detection accuracy and timeliness. The coordination time intervals of EMD-GA-ELM models in practical applications are all greater than 0.3s, and the relay action speeds in different modes are all improved, which verifies the higher fault detection level of the proposed strategy in practical applications and can help identify and respond to the security risks of the power system in high-altitude areas.