基于空间电压矢量的电力机车四象限整流的研究

本论文侧重于三相电压型PWM整流器及其控制系统的工程设计与实现,以提供一种较为实用的控制器设计与选取方法。论文主要内容包括算法研究、控制器设计、装置开发、样机仿真。介绍了四象限整流器为核心的电力机车系统,阐述了四象限整流器的运行原理及控制电路设计;提出一种简单的空间电压矢量算法,该算法在矢量区间判断上采用非坐标变换法进行判断,给出了在各个扇区中的矢量选择以及作用时间的计算公式。这种改进方法对SVPWM控制算法有一定程度的简化,从而使其更易于数字化实现。最后建立了Matlab/Simulink环境下的仿真模型,对上述控制算法进行了仿真,仿真结果验证了控制算法的正确性和可行性。同时,这种控制算法亦能使整流系统的能量双向流动,实现能量再生,且具有控制算法简单、直流电压利用率高的特点。

Research of 4-quardant Rectifier for Electric Locomotive Based on SVPWM

This dissertation focuses on the engineering design and realization of high power three-phase Voltage Source Rectifier(VSR) with emphasis on the control technique.The dissertation work,covering the methodology study,controller design,prototype implemen- tation and experiment,is presented as following.Electric locomotive system mainly concentrated on 4-quardant rectifier is stated.Circu- late principle and Control system design of electric locomotive 4-quardant rectifier are presented.A simplified algorithm is proposed in this paper for space voltage vector,which adopting non-standard vertical reference frame to judge the vector sector and calculate the ac- tion time.The ways make the calculate load of the SVPWM reduced and more easily digital applied.At last,the whole simulation mod- ule of control system is built up under the power Matlab/Simulink platform and the above several ways are used in the simulation mod- ule.The result of the simulation proves that control ways are right and feasible.At the same time,from the concrete analysis,the rectif- ying system applied the simple algorithm can make the power bi-directional flow.Moreover,its control algorithm is easy and the range of DC utilizing efficiency is large.