Control method and system for DC-DC conversion unit in non-contact power supply system

Abstract

The invention discloses a control method for a DC-DC conversion unit in a non-contact power supply system. The method comprises: combining a feedforward control link and an error feedback link in a current control link of each DC-DC converter; in the feedforward control link, performing feedforward PI control on the actual output current and the expected current in the DC-DC converter to obtain afeedforward output quantity; and the error feedback link performing feedback PI control on the difference between the actual output current and the expected current and zero, and generating a compensation signal to correct the feedforward output quantity. The invention further discloses a control system which comprises a feedforward control link and an error feedback link. The feedforward controllink is used for performing feedforward PI control on the actual output current and the expected current in the DC-DC converter to obtain a feedforward output quantity. The error feedback link is usedfor performing feedback PI control on the difference between the actual output current and the expected current of the DC-DC converter and zero, and generating a compensation signal to correct the feedforward output quantity. The method and the system have the advantages of stable and reliable output and the like.

Description

technical field [0001] The invention mainly relates to the technical field of rail transit, in particular to a control method and system for a DC-DC conversion unit in a non-contact power supply system. Background technique [0002] Compared with urban rail transit vehicles using catenary and third-rail power supply, urban rail transit vehicles using non-contact power supply have the advantages of good environmental practicability, and are not prone to safety hazards such as leakage, electric shock, and arcing, etc., reducing operating costs. Cost, reducing the maintenance work on the power supply line. [0003] Urban rail transit vehicles with non-contact power supply adopt a structure in which a small number of ground coils correspond to multiple on-board secondary coils (also known as pickup coils). The closed-loop control method on the ground and the vehicle position detection device can adaptively control the transmitting coil. switching. However, because the vehicle ...

AI Technical Summary

Problems solved by technology

From the analysis in the previous section, we can see that as the secondary side picks up the voltage u 0 changes, the diode rectifier circuit is uncontrollable, and its output DC voltage u dc1 Also changes, resulting in the input instability of the subsequent DC-DC converter, which indirectly affects the DC bus voltage

Images