Research On Selected Harmonic Elimination Technology Of PWM Inverter Based On Differential Evolution Algorithm

In the 21 st century,power electronic technology is increasingly advanced,inverter as a core member of power electronic devices,is widely used in daily life,from large to DC transmission system,to small to life lighting.But at the same time,its harmonic problems can not be ignored,so the elimination of these harmonics has become an important part of the inverter research.There are many commonly used techniques to eliminate harmonics.In this paper,a variety of PWM techniques are described respectively,and the specific harmonic elimination techniques are discussed emphatically.First,respectively,the voltage type inverter circuits of three different structure of single polar and bipolar output voltage waveform Fourier analysis,through the determination of eliminating harmonic to establish a simplified Fourier series,resulting from the simplified nonlinear equations,research in selective harmonic elimination technique,it is difficult to find a suitable algorithm to solve this equation.Secondly,Newton iterative method is one of the methods to solve the above problems,and it must have good initial value when used.Both genetic algorithm and differential evolution algorithm can randomly select initial values,and the switching Angle can be obtained by solving the nonlinear transcendental equations with Newton iterative method,genetic algorithm and differential evolution algorithm respectively.Differential evolutionary algorithm and this paper mainly research on the application of selective harmonic elimination technique,and in a typical three-phase voltage type inverter circuit,for example,by choosing the proper mutation operator,crossover operator and the evaluation function of MATLAB programming to solve the switch Angle,under this kind of algorithm,Simulink modeling and simulation analysis,the observed output voltage and current waveform is good,the harmonic elimination is also in line with the theory,proved feasibility in selective harmonic elimination technique,differential evolution algorithm.Then,for the characteristic harmonic elimination technology of differential evolution algorithm,the harmonic distortion rate under different resistive inductive loads is studied,and the method to minimize the influence of harmonic on the output current of inverter under different conditions is found out.Then Newton iterative algorithm and genetic algorithm of switch Angle data load simulation model,simulation comparison mentioned above resistance inductive load simulation results of three kinds of algorithm,turned out not to the low harmonic suppression,or computing speed,the differential evolution algorithm is the best effect,illustrates the selective harmonic elimination technique based on differential evolution algorithm has certain reference value in practical application.Finally,respectively for sinusoidal PWM technology,space vector PWM technique is applied to a typical three-phase voltage type inverter circuit to the modeling and simulation,and calculate the comparison of three different harmonic elimination technique of harmonic elimination and utilization rate of dc voltage,proved that the selective harmonic elimination technology to eliminate the effect of low harmonic is one of the best in three kinds of PWM technology,selective harmonic elimination technique based on differential evolution algorithm simulation of dc voltage utilization rate is highest,it provides a new idea for improving the utilization rate of dc voltage..