三电平逆变器SHEPWM技术的所有解问题

发布时间：2018-11-03 19:06

【摘要】：针对多电平逆变器特定谐波消除SHEPWM(selective harmonic elimination pulse-width modulation)求解非线性方程组对开关角度初值依赖性高的问题,采用三角函数倍角关系将三电平中点钳位NPC(neutral pointclamped)逆变器SHEPWM非线性方程组转换为代数多项式的模式,并利用MATLAB中的Solve函数对多项式模型进行求解,在无需开关角初值的情况下得到了全调制比下的所有解。给出了开关角及线电压谐波失真THD(total harmonics distortion)随调制比变化的轨迹,分析和比较了开关角解的分布特点,为实际工程中开关角度的选取提供了理论依据。最后仿真和实验验证了利用Solve函数所求开关角度的正确性和可行性。
[Abstract]:For the specific harmonic elimination of multilevel inverter (SHEPWM (selective harmonic elimination pulse-width modulation), solving the nonlinear equations is highly dependent on the initial value of switch angle. The SHEPWM nonlinear equations of three-level neutral-point clamped NPC (neutral pointclamped) inverter are transformed into algebraic polynomial by using the trigonometric function doubling relation, and the polynomial model is solved by Solve function in MATLAB. All the solutions of the full modulation ratio are obtained without the initial value of the switching angle. The track of switching angle and linear voltage harmonic distortion THD (total harmonics distortion) with modulation ratio is given, and the distribution characteristics of switching angle solution are analyzed and compared, which provides a theoretical basis for the selection of switch angle in practical engineering. Finally, the correctness and feasibility of the switch angle obtained by Solve function are verified by simulation and experiment.
【作者单位】：华东交通大学电气与自动化工程学院;
【基金】：国家自然科学基金资助项目(51167006) 江西省工业科技支撑计划资助项目(20161BBE50057) 江西省自然科学基金资助项目(20161BAB206157) 江西省教育厅自然科学基金资助项目(GJJ160495)
【分类号】：TM464

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