摘要
特定消谐式逆变器能够通过对方程组的计算对事先指定的谐波进行消除,因此在理论上能有效地消除谐波。开关器件的导通和关断都需要一定的时间,这使理想输出电压波形中的窄脉冲难于硬件实现。为了得到实际输出电压波形,根据开关器件通断时间的具体要求,提出了展宽开关角对的优化策略。展宽开关角对可分为向前展宽、向后展宽和对称展宽,其中对称展宽在降低谐波幅值和总谐波畸变率方面优于向前展宽和向后展宽。理论分析、数字仿真和试验结果表明,所提出的优化策略可以达到硬件实现容易和总谐波畸变率较小的目的,从而为特定消谐技术更好地应用于工程实际提供了有效的手段。
The selective harmonic elimination inverter can eliminate predetermined harmonics by calculating the equations set, therefore harmonics can be eliminated effectively in theory. The connection and break of switch devices all need a little time, thus the narrow pulse of the ideal output voltage waveform is difficult to realize. For obtaining practical output voltage waveform, the optimized strategy of widening a couple of switch angles is presented based on the specific requirement of on-off time of switching device. Widening a couple of switch angles may be divided into forward-widening, backward-widening and symmetry-widening, in which symmetry-widening is more fovorable than forward-widening and backward-widening for reducing harmonic amplitude and total harmonic distortion. Theoretical analysis, numerical simulation and experimental results show that optimized strategy presented may achieve the aim of easy hardware implementation and little total harmonic distortion, accordingly effective means is provided for the application of selective harmonic elimination technology in engineering.
出处
《电工电能新技术》
CSCD
北大核心
2006年第2期21-23,46,共4页
Advanced Technology of Electrical Engineering and Energy
基金
黑龙江省科技攻关资助项目(G99A11-3)
关键词
特定消谐技术
开关角
展宽
总谐波畸变率
selective harmonic elimination technology
switch angle
widening
total harmonic distortion
