摘要
Abstract
In traction driving system, asynchronous modulation and single pulse modulation are often used in low and high frequency regions, while in medium region, in order to improve the quality of the output waveform, optimal synchronous modulation is necessary. Current harmonic minimum PWM (CHMPWM) is one of the optimal synchronous modulation methods. Because of its excellent harmonic performance of output current, CHMPWM is considered in special. In this paper, a hybrid pulse width modulation strategy on the basis of current harmonic optimization is proposed, by considering the solution of CHMPWM angles and the influence of different angle distributions on its performance. A comparison between CHMPWM and SHEPWM is carried out by considering current harmonics and torque pulsation. By use of FPGA design, the hybrid PWM modulation strategy is implemented. As a result, a smooth transition between different modulation methods is achieved, and the harmonics features of motor current in medium and high frequency regions are improved. Simulation and experimental results confirm the effectiveness and validity of the proposed scheme.关键词
电流谐波最小脉宽调制/低开关频率/数字实现/平滑过渡Key words
Current harmonic minimum PWM/low switching frequency/digital implementation/smooth transition分类
信息技术与安全科学
