基于载波实现的三电平过调制策略研究

在深入研究双模式过调制策略原理的基础上,提出一种在线性调制区、过调制一区和二区均为适用的通用载波实现方法,定量分析其与矢量思想的统一性,并在具体程序执行时间及实现方式等方面将其与两种典型的过调制策略进行对比分析。与现有的矢量实现过调制策略相比,所提载波实现方式仅需若干逻辑判断和简单数学运算即可实现从线性调制到方波调制整个过调制区间内的平滑过渡,具有运算量少、总谐波畸变小和便于工程应用的优点。最后,通过一台10kW三电平逆变器样机进行验证,证明所提过调制策略载波实现方式的有效性和工程可行性。

Study of Three-level Inverter Carrier-based Over-modulation Strategy

Basically,this paper intensively studies the strategy of dual-mode over-modulation theory; putting forward to a method which makes the application of common carrier wave in linear modulation area, over-modulation No.1 area as well as No.2 area comes true, at the same time analyzing its integration with vector principle. And in terms of program execution time and achieve specific methods which were compared with two typical over-modulation strategy, This method could achieve the smooth transition from linear modulation area to the whole area of square wave ,so in large extend, it will help to lessen the work in calculating and the application in engineer. In the end, to prove the feasibility and engineering possibility of the method proposed in this paper, We build a three-level inverter 10kW prototype of the proposed over-modulation strategy implementation will be verified to prove its effectiveness and feasibility.