中文摘要：

逆变器是微电网运行与控制的重要基础，本文基于逆变器的离散数学模型提出了一种微电网中分布式电源逆变器的数字多环反馈控制方法。电流控制内环采用无差拍控制实现两个采样周期内对参考值的快速跟踪。中间的电压控制环在同步旋转坐标系下实现电压幅值和频率的解耦控制，并采用重复控制方法抑制周期性的扰动，能够有效地抑制微电网中不平衡和非线性负荷引起的负序和谐波干扰。外围的功率控制器通过模拟下垂特性实现与微电网中其他分布式电源逆变器之间的协调。本文还对各个控制环节的闭环稳定性进行分析和参数设计，并通过仿真实验证明了方法的有效性。

英文摘要：

Inverter is an important foundation of the control and operation of microgrid. This paper presents a digital multiple-loop feedback control method for the distributed generation inverters in a microgrid based on discrete mathematic models. The proposed control method utilizes deadbeat control in the inner current control loop to track the reference values in two sample periods. The intermediate voltage control loop controls the volt-age magnitude and frequency decoupled by synchronous rotating frame. It also uses repetitive control to reject the periodic disturbance and effectively restrain the negative sequence and harmonic interference caused by the imbalance and nonlinear loads in microgrid. The outer power controller coordinates with other distributed gener-ation inverters by imitating the droop characteristic. The close-loop stability of the proposed control method in each loop are studied and designed. Furthermore,the simulation results demonstrate its effectiveness. This work is supported by The Yangtze river scholars and innovation team development plan （ IRT1114 ） .