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。
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 method.
出处
《电工技术学报》
EI
CSCD
北大核心
2011年第11期45-52,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50777055
50737002)
