Abstract
For high-speed rail with high energy consumption, the recovery and utilization of regenerative braking energy is essential to improve the energy consumption of high-speed rail. As a technical link, the energy bidirectional feed inductively coupled power transfer (ICPT) system can realize the regenerative braking energy recovery of the contactless traction power supply system. Furthermore, considering that the braking energy of the high-speed rail is the largest when entering the station during the whole line operation, the braking section of the station is mainly considered. This paper proposes a preset control method for segmented power supply of the energy bidirectional feed ICPT system considering regenerative braking energy recovery. By establishing the steady-state mathematical model of the bidirectional ICPT system, the influence of the internal phase-shift angles φ1 and φ2 and the external phase-shift angle γ on the operating state of the system is analyzed. To realize system synchronization under the operation of EMUs, a train braking model is established through force analysis, and a power preset controller is designed to realize the synchronous control of the power flow of the bilateral system. According to the braking process of the train entering the station, the switching control method of the segment coil under the different conditions of the single train entering the station and the multitrain entering the station is proposed to ensure the reliability and flexibility of the train power supply. The simulation results of the 350 kW ICPT system simulation model show that the system can operate stably when the power transmission simulation is switched, and the transmission efficiency can reach 89%, which proves the feasibility of the control method. Energy-saving estimates show that a single train can recover about 200–300 kWh of electric energy during single braking. The comparison with the measured data verifies the accuracy of the modeling in this paper.
Highlights
Electrified rail transit system is an important load of the power system
When the system is in the regenerative braking mode, the onboard part of the motor reverses to become a generator, through the AC/DC link to obtain the standard 2800 V direct current for the bidirectional inductively coupled power transfer (ICPT) system, and the regenerative braking energy is fed back to the ground part through the magnetic coupling coil. e ground part selectively feeds back the regenerative braking energy to the DC bus through the PET link or recovers the regenerative braking energy through energy storage devices such as supercapacitors and batteries
Based on the above mathematical analysis of the bidirectional ICPT system, the control method more suitable for the application background of this paper is to control the output side to work at 0 or π power angle θP, so as to ensure the high efficiency of the system while eliminating the communication channel to achieve bilateral phase synchronization
Summary
Electrified rail transit system is an important load of the power system. According to statistics, by the end of 2018, China’s high-speed railway operation mileage has reached 29000 km, and the total power consumption of the railway in 2018 is up to 71.1 billion kWh, of which high-speed railway consumes about 40% [1]. Erefore, the ICPT system with energy bidirectional feed is the key to solve the problem of contactless traction power supply regenerative braking energy recovery. Based on the application background of rail transit, the forward transmission mode of bidirectional ICPT system can realize traction power supply, and the reverse transmission mode provides a recovery channel for regenerative braking energy. This paper divides the regenerative braking process of the train according to the characteristic curve, according to the energy flow relationship of the braking process, through the onboard controller responsible for the adjustment of the power flow size and direction of the converter on the side of the train and the ground controller responsible for the power control, provides the switching logic to the ground coil switching, and obtains a sectionalized power supply line suitable for the regenerative braking energy recovery of the high-speed railway cycle power preset switching control method. A: e empirical constant ηG: e transmission efficiency of gearbox ηM: e transmission efficiency of traction motor ηI: e transmission efficiency of inverter ηC: e transmission efficiency of rectifier ηT: e transmission efficiency of automotive transformer
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