基于遗传算法提高超声波电源功率因数的研究

Improved Power Factor in the Ultrasonic Source Using Genetic Algorithms

在SPWM的超声波电源中,输出电压常出现畸变,提出了一种使用遗传运算规则提高超声波电源功率因数(消除高次谐波)的方法。为了获得最佳开关角,叙述了计算方法步骤,通过离线计算,可以得到消除超声波电源中输出电压的3次、5次、7次谐波的最优开关角。运用Matlab软件的仿真波形和实用电源实验波形,都表明了遗传运算规则提高功率因数有缩减计算量,快速收敛和保证最优等优点。

The method for voltage harmonic elimination in a pulse width modulated（PWM）uitrasonic source by using genetic algorithms（GAs）was proposed. Explained the resolution method procedure of the non-linear equation system in order to achieve the appropriate switching angle. The best switching angles are calculated off-line to eliminate the third, fifth and seventh harmonics. The results of experiment and simulation all verifiy that the genetic algorithm method has some advantages such as a reduced computational burden, faster convergence and guarantee global optima in most cases.