摘要
深入研究当前电压型逆变器的死区补偿或无死区正弦脉宽调制(sine pulse width modulation,SPWM)策略,并分析它们存在的问题。在此基础上,提出基于调制函数的并网逆变器无死区SPWM控制策略。为在三相三电平逆变器中应用这种策略,首先采用分相控制达到三相并网电流、调制函数的解耦,然后利用解耦的并网电流调制函数进行无死区SPWM控制。实验证明,这种控制策略简单有效,保证了无死区调制策略的可靠性,并摆脱了传统方法对于硬件检测电路的依赖。
This paper investigated the dead-time compensation and elimination scheme of voltage source inverter, and problems during its implementation. Then, a novel sine pulse width modulation （SPWM） scheme for dead-time elimination in a grid-connected inverter was proposed. To apply the new scheme to the three-phase three-level grid-connected inverter, first the split phase control is used to reach the grid current and modulation function decoupling. Then the decoupled modulation fianctions are used for the dead-time elimination scheme. The new method does not rely on the hardware current detection circuit as the conventional ways do, the availability and the simplicity are verified by the experiment.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第21期70-75,共6页
Proceedings of the CSEE
关键词
无死区
逆变器
三相
分相控制
dead-time elimination
inverter
three phase
split phase control
