Wenli Lin

Maximum Adhesion Force Control Simulated Model of Electric Locomotive

When the traction torque of the electric locomotive exceeds the maximum adhesion force torque, the wheel will have slip/skid phenomena. To fulfill the maximum adhesion force control, a full-order state observer for estimating the adhesion torque was designed. To make DSP programming convenient, a simple control algorithm for slip velocity reference generator was proposed. Then, the simulated control model based on FOC (Field Oriented Control) was built in SIMULINK/MATLAB, and its effectiveness was verified by some specific simulation experiment and waveforms.

Control and Implementation of Reversible Multi-modular Converter with Interleaved Space Vector Modulation

Reversible multi-modular converter has such merits as bidirectional energy flow, unity power factor, high power and high reliability. The Interleaved space vector modulation technique is developed to acquire a high equivalent switching frequency, and reduce the harmonic current injected into AC grid. This paper introduces a new reversible multi-modular converter, which is preferred to be the interface between AC grid and DC bus. Then, the Interleaved space vector modulation technique is demonstrated. Furthermore, a novel parallel control scheme for the reversible multi-modular converter is presented. Results are validated by simulation experiments.

Analysis and design for reducing voltage stress in output rectifier of LFLRV SIV DC-DC converter

This paper presents a full-bridge full-wave DC-DC converter used in 35kVA power grade auxiliary static inverter (SIV) of first low-floor light rail vehicle (LFLRV) in China, where reducing voltage stress in output rectifier diodes is so important for the converter reliability. DC-bias function of high frequency transformer is analyzed and a sensorless digital dc-bias control method by DSP and CPLD without capacitor is given. Voltage spike caused by the secondary winding resonance is analyzed and three output RCD snubber circuit modes are given and compared, the dissipation of each snubber mode is deeply described. Lastly, engineering design methods are additionally given to reduce voltage stress.

Energy-closed AC asynchronous drive test system based on field-oriented vector control

This paper presents a “Two Inverter-Motor” energy-closed AC asynchronous drive test system which uses the asynchronous machine as the dynamic emulation load. The common DC bus of both inverters are connected to each other to circulate the energy and improve efficiency of the system. In this paper, the common DC bus technique and the dynamic loading technique are discussed, and direct field-oriented vector control strategy are used to control speed and torque of the induction machine. Then, we introduce the hardware realization of the control system. At last, experimental results show that this drive test system has excellent dynamical and static performances and high control effect.

Network system research and design for 100% low floor light rail vehicle

100% low floor light rail vehicle (LFLRV) is favored for its small volume, light weight, user-friendly design and its full low floor convenient for all people. 100% LFLRV adopts the structure of independence wheel, which gets rid of the transmission shaft crossing the vehicle in the traditional vehicle, consequently to low the floor. This structure makes the drive control mode obviously differ from other ones, and also leads to a different network system. This paper presents the design of 100% LFLRV in China, including the whole structure design of the network system, the multifunction vehicle bus using CANopen, the traction system design and its control strategy, and especially the intelligent network monitoring system for traction system (TSYS). The humanization interface for control system debugging and monitoring is given at the end of this paper.