Research On New Passing Neutral Section Of EMU Based On Energy Storage Technology

At present,Chinese high-speed railways are set up with an electrical neutral section at regular intervals,and the frequent passing neutral section of trains will have an impact on the normal operation of a wide range of on-board electrical equipment.The auxiliary power supply system is an important part of the power supply system of the rolling stock,supplying power to the low and medium voltage AC loads in the train to ensure the comfort of the passengers on board.The power supply is interrupted when the train is out of electrical neutral section,so regenerative braking of the traction motor is used on CRH380 BG trains to supply power to the auxiliary loads,but working in this mode results in more speed loss when the train is inert and out of electrical neutral section.When the train is running on a long gradient,the speed will drop even more and there is a greater chance of stopping in the electrical neutral section once the speed into the neutral section is not high.It can also have a serious impact on the train experience when the power goes out in emergency situations.In this paper,the CRH380 BG train of passing neutral section is used as a research object to supply power to the auxiliary load during the passing neutral section by adding an on-board energy storage device.Firstly,the analysis of passing neutral section about the CRH380 BG magnet type is carried out,and the passing neutral section scheme and control strategy based on the on-board energy storage device are established for the problem that the regenerative braking of the traction motor during the passing neutral section process will reduce the train speed.The results show that the mathematical model is correct;then the proposed scheme of bi-directional DC/DC converter double closed-loop PI control and high-order sliding mode control strategy is simulated and analysed,and the results show that both control strategies are feasible.The results show that this solution can replace the regenerative braking of the traction motor to power the auxiliary power supply system when the train is passing neutral section,and at the same time,when the stored energy is large enough,it can provide power to the train’s auxiliary inverter for a longer period of time in the event of an emergency stop due to a power failure in an emergency situation,ensuring the safety of the passengers and the needs in an emergency situation.