在线自适应PWM死区消除方法.pdfVIP

2011 年 11 月 电 工 技 术 学 报 Vol.26 No. 11 第 26 卷第 11 期 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Nov. 2011 在线自适应PWM 死区消除方法 杨 波 吴建德 李武华 何湘宁 （浙江大学电气工程学院 杭州 310027 ） 摘要 通过对死区效应原理和死区消除原则的分析，提出一种在线自适应的PWM 死区消除 方法。该方法通过在线跟踪负载变化，自适应地计算出最优的电感电流过零区域宽度，以精确实 现电流过零区域和电流非过零区域中死区效应的分别消除，从而在整个正弦调制周期内达到最佳 的死区消除效果。与传统的死区消除和补偿方法相比，该方法对电流过零处电压畸变的抑制效果 尤为明显，能有效地降低输出电压低次谐波含量，使 THD 明显减小。仿真和实验结果证明了该 死区消除方法的有效性和实用性。 关键词：死区消除 在线 脉冲宽度调制 电压源型逆变器 数字信号处理器 中图分类号：TM464 Online Adaptive Dead-Time Elimination Method for PWM Voltage Source Inverters Yang Bo Wu Jiande Li Wuhua He Xiangning （Zhejiang University Hangzhou 310027 China ） Abstract A novel online adaptive dead-time elimination method is presented in this paper for PWM voltage source inverters, based on the analysis of dead-time effects and the principle of dead-time elimination. Tracking the load change on-line and determining dynamically the current direction, the zero current zone and the non zero current zone of the output inductor are precisely distinguished and the optimal width of the zero current zone is adaptively calculated. Furthermore, the dead-time effects are completely eliminated in the whole sinusoidal modulation cycle. In comparison with traditional dead-time compensation and elimination methods, the proposed method can significantly restrain the output distortion in the zero current zone and reduce the low-frequency harmonic contents and THD. The simulation and experimental results demonstrate the validity and practicability of the proposed