发电用微型燃气轮机三相四桥臂逆变器解耦控制

摘要

针对发电用微型燃气轮机系统中的三相四桥臂逆变器,提出了基于内阻变换的解耦控制策略。主要将逆变器和其输出滤波器作为一体化逆变电源,进行一体化建模和一体化控制。经过等效变换,将零线桥阻抗值变换为零,将其他各相的阻抗等效地降为较低的阻抗值,将其解耦成三个相互独立的单相逆变器。控制方法上,采用幅相多环控制,特别是对不平衡和非线性负载具有良好的控制能力。仿真和实验结果验证了该控制方法的正确性和有效性。%In the microturbine power system,decoupling control strategy of three-phase four-leg inverter is proposed based on the internal impedance transformation.The inverter and its output filter are regarded as an integrated inverter power supply to modeling and control as a whole unit.After equivalent transformation,the impedance of zero-leg is transformed into zero and the others are reduced to a lower equivalent impedance value.The three-phase four-leg inverter is decoupled into three independent single-phase inverters.In this scheme,an amplitude-phase multi-loop system is applied.Advantages of the four-leg inverter structure are exerted particularly for unbalanced and non-linear load.The simulation and experiment results show that the control method is correct and effective.