基于状态反馈精确线性化的三相逆变器加权功率并联

Power Weighting Parallel Operation for Three-Phase Inverters Based on State Feedback Linearization

传统的三相逆变器系统加权功率均分需通过加入加权平均电路或者加入虚拟阻抗才能得以实现。通过基于反馈线性化的单机控制方法,阐述了三相逆变器并联系统在dq0坐标系下不需要附加电路和虚拟阻抗就能够比较准确地实现系统功率的加权均分。通过非线性控制的逆系统方法,对考虑了死区效应的三相三线逆变器进行了反馈线性化的控制设计。最后在反馈线性化控制的基础上,论述了三相逆变器并联系统在dq0坐标系下实现加权功率均分的可能性。实验表明,所提出的控制策略在保证加权功率均分稳态准确度的基础上,还可提高系统的动态特性。

The power weighting distribution of three-phase parallel inverter system can be realized only by adding weighting circuits or virtual impedances. In this paper, based on single inverter with feedback linearization control, the parallel inverter system is able to achieve power weighting distribution accurately in dq0 coordinate without the additional circuits or virtual impedances. Through inverse system method of nonlinear control, the feedback linearization control for three-phase three-wire inverter with the consideration of dead-time effect is illustrated. Moreover, the possibility of power weighting distribution for three-phase parallel inverters in dq0 coordinate is further discussed. The experimental results demonstrate that the proposed control strategy can guarantee the steady state precision of power weighting distribution. In addition, the dynamic characteristics can be improved.