摘要
在并网逆变器中,为防止同一桥臂上的上下两个器件发生直通现象,必须注入微秒级的死区时间。死区时间越长,并网逆变器的工作越安全,但逆变器输出的电压波形质量会变差,同时对负载及电网造成不同程度的影响。因此有必要对死区效应进行深入研究。本文对死区效应进行了理论分析,研究了并网逆变器中死区时间对输出电压的影响,最后对并网系统的死区效应进行了仿真实验研究。
In the photovoltaic inverter, a few microseconds of dead-time must be inserted in the switching signals to prevent a short circuit. The longer the dead-time is, the photovoltaic inverter works more safely. However, with the dead-time increasing, the output voltage waveform of the inverter will be distorted more severely, and the load and the grid will be impacted as well. Therefore, it is necessal7 to conduct an in-depth investigation on the dead-time. The current paper firstly renders a theoretical analysis on the dead- time, followed by exploring the effects of the dead-time in the inverter on the output voltage. Finally, it presents the simulation study on the dead-time effect on the grid-connected system.
出处
《电网与清洁能源》
2010年第9期48-53,共6页
Power System and Clean Energy
基金
国家自然科学基金资助项目(50677018)
关键词
并网逆变器
死区效应
基波电压
载波频率
功率因数
谐波含量
photovoltaic inverter
dead-time effect
fundamental voltage
carrier frequency
power factor
harmonic content
