CAJ | 학술논문

本文对脉宽调制(PWM)方式中的分段同步调制方式进行了分析,将正负半周期镜对称,且在半周期内前后周期以π/2为轴线对称的SPWM波表示为傅里叶级数的形式,以载波比N为控制量,开关频率为限定条件,输出电压中谐波分量最小为目标,利用遗传算法求解非线性规划问题的优势,将遗传算法用于在不同频段下最优载波比N的求解问题中,并对所得结果进行了Simulink仿真对比验证,证明了该算法的可行性和有效性.
본문대맥관조제(PWM)방식중적분단동보조제방식진행료분석,장정부반주기경대칭,차재반주기내전후주기이π/2위축선대칭적SPWM파표시위부리협급수적형식,이재파비N위공제량,개관빈솔위한정조건,수출전압중해파분량최소위목표,이용유전산법구해비선성규화문제적우세,장유전산법용우재불동빈단하최우재파비N적구해문제중,병대소득결과진행료Simulink방진대비험증,증명료해산법적가행성화유효성.
As one important method of PWM, piecewise synchronous modulation is analyzed in this paper. The method makes the positive half period and the negative half period mirror symmetrical, and expresses the symmetrical SPWM waveform by the form of fourier series in half period, in which the waveform is symmetrical by the axes π/2.Taking the carrier ratio N as its controlled vari-able, switch frequency as its limitation, and the minimum harmonic in output voltage as its goal, the method can solve the problem of optimal carrier ratio in different frequencies based on genetic algorithm, which has the advantage of solving nonlinear programming problems. At last, simulation results prove that this method is correct and effective.