60°坐标系下三电平逆变器SVPWM的关键问题

The Key Problems of Three Level Inverter SVPWM in the 60 Degrees Coordinates

在学习与应用60°坐标系SVPWM优化算法过程中,认为在60°坐标系下SVPWM算法不需要三角函数的计算和查表运算,是对60°坐标系SVPWM算法的误解。为纠正这一误解,对传统SVPWM算法和60°坐标系SVPWM算法进行了比较分析,并从理论推导和DSP实现两个方面做了相关阐述。详细介绍了如何用DSP F28335实现60°坐标系下三电平逆变器的SVPWM十二路驱动波形的输出并用示波器观察输出的波形。证明了60°坐标系下的SVPWM算法只是减少了三角函数的计算量,而且在用DSP F28335实现该算法时不需要三角函数的查表运算。使用这一算法提高了系统的运行效率。

In the process of learning and applying the 60 degrees coordinate system SVPWM optimization algorithm, a lot of literature thinks that SVPWM does not need the calculation of the trigonometric function and the operations of look - up table, but the paper argues that this is a misunderstanding of 60 degrees coordinates system SVPWM algorithm. In order to correct the misunderstanding, the paper makes a comparative analysis of the traditional SVPWM algorithm and the 60 degrees coordinates SVPWM algorithm, and does a related elaboration from the two aspects of theoretical derivation and the DSP implementation. After that, it introduces detailedly how to realize the output of SVPWM 12 road driving waveform of the 3 - level inverter in 60 degrees coordinates and observes the output waveform using the oscilloscope. It proves that SVPWM algorithm in 60 degrees coordinates only reduces the calculation of trigonometric function, and it does not require trigonometric function table lookup operation when uses DSP F28335 to realize the algorithm. The algorithm improves the operation efficiency of the system.