基于随机牛顿法(SNM)的级联多电平逆变器特定谐波消除

Selected harmonic elimination in cascaded multi-level voltage inverters based on the stochastic Newton method(SNM)

特定谐波消除脉宽调制(SHEPWM)技术,通过计算最优的开关角度,在保证期望基波电压输出的同时有效消除选定的低次谐波,具有开关频率低、波形质量高等一系列优点。为了提高SHEPWM非线性方程组的求解可靠性和快速性,提出了将粒子群优化算法(PSO)与牛顿迭代法相结合的随机牛顿法(SNM),通过Matlab编程求解SHEPWM非线性方程组验证了SNM求解的可靠性和快速性。最后通过搭建单相7电平级联H桥逆变器和三相D型接线11电平级联H桥逆变器仿真实验系统,验证了SNM求解的开关角度能够实现基波控制目标并有效消除选定的低次谐波。

The technology of selected harmonic elimination pulse width modulation（SHEPWM） can be used to eliminate the selected low-order harmonics and satisfy the demand of desired fundamental voltage by calculating the optimal switching angles, this method has a series advantages such as low switching frequency and high-quality waveforms, etc.In order to improve the reliability and rapidity of calculating for the SHEPWM non-linear equations, this paper presents the stochastic Newton method（SNM） which is composed of the particle swarm optimization（PSO） and the Newton method, the reliability and rapidity of the SNM is verified by a program for SHEPWM non-linear equations.In the end, the simulation experimental systems of seven-level single-phase cascade inverter and eleven-level three-phase D connected cascaded inverter are designed and tested that the selected low-order harmonics are eliminated by the switching angles calculated by the SNM and the fundamental voltage is produced.