Abstract
This paper proposes a ground-side power transmitting coil parameter design method that takes the length of the transmitting coil as an optimization target, which takes into account the driving speed of EV (Electrical Vehicle), the EV's power consumption per kilometer, the coil energy loss and the system charging efficiency. The system uses a long-track transmitting coil, rectangular receiving coil, and LCC-S resonance compensation topology. First, the charging power and energy transmission efficiency are calculated. Based on the condition that the dynamic wireless charging power within 1km is not less than the EV's power consumption per kilometer, the lower limit of the charging power is determined. Secondly, the minimum value of transmitting coil current is inferred from the peak value of the charging power, the corresponding compensation inductance and transmitting coil wire diameter are further obtained, then the relationship between the system efficiency, the load resistance and the transmitting coil length is calculated. Under the condition that the charging efficiency is not less than 80%, the selection range of the transmitting coil's length and the load resistance value is initially determined, which further refined by combining the curve of the charging power with the load resistance value and “2 second principle”. Finally, aiming at segmenting a road section of 1 km in integers with the least number of transmitting coil segments, the number of transmitting coil segments and coil length that simultaneously meet the economic requirements for coil laying and system efficiency are determined. Finally, the feasibility of the above transmitting coil parameter design method is verified through experiment. The parameter design and optimization method of ground-side power transmitting coil of EV DWPT charging system proposed in this paper provides a reference for the design of the power transmitting coil length of EV DWPT charging system in the high-speed driving scene.
Highlights
Compared with traditional fuel vehicles, electric vehicles are becoming an important choice for solving today’s energy and environmental problems
WPT technology for EV is divided into static wireless power transmission (SWPT) and dynamic wireless power transmission (DWPT)
This paper proposes a method for selecting the length of the transmission coil in a long-track EV-DWPT system that combines the vehicle speed limit and the energy loss of the power transmitting coil
Summary
Compared with traditional fuel vehicles, electric vehicles are becoming an important choice for solving today’s energy and environmental problems. The transmission coil structure of the long-track DWPT system is more suitable for EVs to perform dynamic wireless charging at high driving speed, a more suitable resonance compensation network for DWPT system needs to be further studied. Based on the EV driving speed, transmitting coil energy loss, and system charging efficiency, a method for selecting the transmitting coil length and resonance compensation network parameters of a long-track EV DWPT charging system is proposed. Let the number of EVs in the charging area be n-1, L2-Ln and R2-Rn represent the self-inductance and internal resistance of the vehicle-side power receiving coil respectively, C2-Cn are the resonance compensation capacitors at the receiving-side, and RL2-RLn are the equivalent load impedance of the receiving side of EVs, which can be adjusted through an impedance matching network (IMN).
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