特定谐波消除脉宽调制(Selective Harmonic Elimination Pulse Width Modulation——SHEPWM)，顾名思义，通过开关时刻的优化选择，产生PWM来消除选定的低次谐波，具有波形质量高、效率高、直流电压利用率高、直流侧滤波器尺寸小等显著优点，越来越受到人们的青睐。 三电平SHEPWM试验电路模型
By use of power sums theory, an algorithm to solve two-level SHEPWM nonlinear transcendental equations is put forward which can reduce computational burden greatly.
运用“幂和理论”，提出一种两电平SHEPWM非线性超越方程组求解算法，可显著降低运算量。
According to the generating theory of SHEPWM wave, a design of digital firing circuit on SHEPWM based on CPLD is implemented and correctness of design is verified by practical experiment.
根据SHEP - WM波形发生原理，设计和实现一种基于CPLD的SHEPWM数字触发电路。通过实际的现场实验，验证设计的正确性。
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