Multi-Timescale Energy Management Strategy for Flexible Traction Power Supply System with Photovoltaic and Hybrid Energy Storage

Under the impetus of the dual-carbon background, rail transit, as a large energy consumer, plays a significant role in guiding its green and low-carbon development to promote the achievement of dual-carbon goals. This paper proposes a multi-timescale coordinated scheduling optimization method for a flexible traction power supply system considering photovoltaic access. In response to the uncertainty of photovoltaic and traction loads, a day-ahead-intraday economic operation optimization model is established. With the aim of reducing the daily comprehensive operating cost and taking the three-phase voltage imbalance as a constraint, a rolling optimization correction is carried out on the energy management strategy. This approach achieves a reduction in the comprehensive energy consumption of green rail transit and enhances the operational efficiency and economy of the flexible traction power supply system under the context of photovoltaic power generation access, providing theoretical support for the development of green and efficient rail transit systems.