Research On Regenerative Braking Energy Utilization And Negative Sequence Control Of Electrified Railway Based On Energy Storage RPC

In order to cope with global climate change,China put forward the double carbon goal of‘carbon neutrality,reach the CO₂ emission peak’in the 14th Five Year Plan.It intends to steadily promote energy conservation and emission reduction in all walks of life,and finally build a new power system with new energy as the main body.With the high-speed and heavy-load development of China’s electrified railway,negative sequence and regenerative braking energy have become important factors that restrict the green and energy-saving operation,safety and stable development of electrified railway.In order to realize the negative sequence control,improve the utilization rate of regenerative braking energy,and assist the energy-saving and efficient operation of electrified railway.Taking V/v traction power supply system as an example,based on the analysis of its traction load characteristics,the negative sequence control and regenerative braking energy recovery and utilization based on the energy-storage railway power regulator are studied.The specific contents are as follows:（1）Analyze the negative sequence generation mechanism and regenerative braking energy transfer law of V/v traction power supply system,conduct field measurement of traction load data,establish traction power supply system load model according to the structure and measured data of V/v traction power supply system,and provide a basis for follow-up research.（2）The topology scheme of energy storage railway power conditioner is described.energy-storage railway power conditioner under different working condition of power supply arm of the working mode is analyzed,and the negative sequence based on energy-storage railway power conditioner and regenerative braking energy compensation mechanism and compensation performance of the key factors affecting the deduction.（3）In order to realize the negative sequence V/v traction power supply system of governance and regenerative braking energy recycling as the goal,the energy-storage railway power conditioner control strategy study,this paper proposes a hierarchical control strategy,a detailed discussion on each part of the strategy implementation process,and finally build the simulation model,using static load model and the measured data,the method of combining The simulation results are verified and analyzed,and the results show that the proposed layered control method can realize the recovery and utilization of regenerative braking energy and negative sequence control within the range of system equipment capacity.（4）Aiming at the problem that the negative-sequence complete compensation method taking into account the power flow of energy storage system is prone to failure when exceeding the capacity of system equipment,a compensation optimization method is proposed,its optimization objective function and constraint conditions are derived,and a simulation model is constructed.The simulation results are verified and analyzed.The results show that:The proposed method can realize negative sequence control and regenerative braking energy recovery and reuse in the full capacity range,reduce the load peak-valley difference of the traction power supply system,stabilize the intermediate DC side voltage of the energy-storage railway power conditioner,and play a positive role in the safe and stable operation of the compensation system.