摘要
针对三电平特定消谐逆变器,给出了在Walsh域建立SHEPWM(Selective Harmonic Eliminated PWM)模型的简便方法,省略了Walsh域与Fourier域间的转化,并提出了窄脉冲直接判断省略法与有效集算法相结合的优化算法。该优化算法下逆变器具有开关损耗低,硬件电路可实现性强的优点。通过MATLAB/SIMULINK仿真与DSP实验分析发现,经优化后的触发脉冲最小宽度增大到200μs,逆变器拟消除的谐波次数增加了6次,大大的提高了三电平特定消谐逆变器的转换效率与实用性。
A convenient method to establish the selective harmonic eliminated PWM （SHEPWM） model applied to three-level inverter in Walsh domain is presented in this paper. In the method, the conversion from the Walsh domain to the Fourier domain is omitted, and the optimization algorithm based on direct-omitting minimum puXse and activeset algorithm is proposed. Using the algorithm, the inverter achieves benefits of low switching losses and high hardware circuit feasibility. Simulation and experiment with MATLAB/SIMULINK show that the number of harmonics to be eliminated increases 6 times, and the minimum width of trigger pulse after optimization increases to 200us. Therefore, the conversion efficiency and practicality of the three-level inverter are improved greatly.
出处
《电测与仪表》
北大核心
2014年第7期29-32,共4页
Electrical Measurement & Instrumentation
