Composite Differential Evolution Algorithm, Selective Harmonic Mitigation, Low Carrier Ratio

What is it about?

This paper presents a new method of switching angle solution based on Composite Differential Evolutions (CoDE) in Selective Harmonic Mitigation PWM (SHMPWM). The method can effectively improve the global searching ability and convergence rate of the solution by the combination of multiple composite trial vectors and control parameter settings. Its great generality makes itself applicable to SHEPWM and SHOPWM as well. This paper introduces the basic principles of SHMPWM and CoDE, constructs the constraint and objective functions by means of penalty, and gives detailed solution steps.The experimental platform finally has been designed and carried out to verify the accuracy and generality of the proposed method.

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Why is it important?

The optimized PWM technique by calculating the switching moments directly can obtain better harmonic performance using less switching times. SHMPWM aims to mitigate as many harmonics as possible to meet the power quality standards and ensure the harmonics of inverter output voltage meet corresponding standards. Though it has the most reasonable harmonic performance, its constraint equations are nonlinear transcendental inequality equations and thus to solve the switching angle is also the most complicated problem.Composite differential evolution (CoDE) algorithm based on both composite vector and parameter control is proposed and investigated to solve the single-objective optimization problem. Dramatically, it improves the global searching ability and the convergence properties.

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