基于级联H桥整流器的双闭环解耦控制策略研究

Research on double closed loop decoupling control strategy based on cascaded H-bridge rectifier

针对级联式电力电子变压器模块的功率、电流失调以及工作状态不平衡所造成的控制策略无法设定的问题,本文以单相d-q矢量转换技术为理论基础,引入虚拟相,并引入了双闭环控制理论,建立了电流内环控制器与电流外环控制器,实现了级联H桥整流器各模块共同占空比的控制策略。最后通过仿真实验进行验证。实验结果显示,本文提出方案能够有效减少无功损失,提升电能输送效率,增强系统运行的稳定性。

Aiming at the problem that the control strategy cannot be set due to the power and current imbalance of the cascaded power electronic transformer modules and the unbalanced working state in the smart grid, the paper takes the single-phase d-q vector conversion technology as the theoretical basis, introduces the virtual phase, and introduces the double closed loop control theory.After that, the current inner loop controller and the current outer loop controller are established, and the control strategy of the common duty cycle of each module of the cascaded H-bridge rectifier is realized. Finally, according to experimental results, the scheme proposed in this paper can effectively reduce the reactive power loss, improve the power transmission efficiency in the smart grid, and enhance the stability of the system operation.