Power Quality Evaluation of Electrified Railway’s Impact on Wind Farm Electric and Its Engineering Application

Abstract

As electrified railway is an unbalanced load with random fluctuations, and its nonlinearity will affect the power supply quality of the power grid near the access point of the traction power supply system, causing various power quality problems; When electrified railway is connected near wind farms, the power quality problems may affect the safe operation of grid-connected wind farms, even caused a large-scale wind farm cut off the grid. To assess the impact of electrified railway access on the power quality of wind farms at the Point of Common Coupling (PCC), combining the characteristics of electrified railways and the actual operation of the power grid, this paper proposes a method for quantitatively evaluating the impact of electrified railways on the power quality of wind farms, and the negative-sequence current conditions is calculated at the grid-connected points of wind farms that tightly operated on one side of the electrified railway and tightly operated on both sides from engineering practical perspective, providing a basis for the comprehensive management of power quality.