Simulating Voltage Dips at the end of Coal Mine Power Supply Systems

Coal serves as the cornerstone resource for electricity generation in China, and its extraction relies on intricate systems. Among these, the coal mine power supply system plays a crucial role. The integration of numerous power supply and consumption devices introduces several challenges related to the quality of electric power, particularly in scenarios involving long-distance power distribution. Notably, voltage drops triggered by the initiation of asynchronous motors significantly hamper mining efficiency. This study undertook a comprehensive modeling and parameter analysis of these electrical devices based on actual power supply systems, culminating in the development of a simulation platform. It specifically investigated the effects of both direct and variable frequency starting methods of asynchronous motors on the system's voltage. To mitigate voltage dips associated with direct starting, the study employed Static Var Generators for compensation, a solution whose efficacy was confirmed through simulation tests.