摘要
针对四桥臂三相逆变电源,提出了一种特定谐波消除的控制方案,通过对预先计算出的各个桥臂的开关时刻进行预置,以消除指定的低次谐波。文中分析了开关点预置控制原理,给出了四桥臂三相逆变器各个桥臂开关点的预置方案。该控制方案消除了低次谐波对输出的影响,在不平衡负载时有较好的输出对称性。仿真和实验结果验证了该方案的可行性。该方案的显著优点是开关频率低,在大功率三相四线制逆变电源中有很好的应用前景。
A control strategy based on selected harmonic elimination is proposed in this paper for three-phase inverter with four legs.Through presetting the switching time of four bridge legs, the lowest undesired harmonics could be eliminated.The theory of switching-node-preseting is discussed and then the method of presetting switching-node for all the four legs is presented.With this strategy ,the inverter can not only eliminate the effect of lowest undesired harmonics, but also output symmetry voltage with unbalanced load.The simulation and experimentation validate the feasibility of the strategy.The notable exellance of this strategy is the low switching frequency, so it can be well applied for the high-power 3-phase 4-line inverters.
出处
《电力电子技术》
CSCD
北大核心
2006年第4期1-3,共3页
Power Electronics
关键词
逆变器
谐波/开关点预置
不平衡负载
inverter
harmonic/switching-node presetting
unbalanced load
