CAJ | 학술논문

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。
역변기시미전망운행여공제적중요기출，본문기우역변기적리산수학모형제출료일충미전망중분포식전원역변기적수자다배반궤공제방법。전류공제내배채용무차박공제실현량개채양주기내대삼고치적쾌속근종。중간적전압공제배재동보선전좌표계하실현전압폭치화빈솔적해우공제，병채용중복공제방법억제주기성적우동，능구유효지억제미전망중불평형화비선성부하인기적부서화해파간우。외위적공솔공제기통과모의하수특성실현여미전망중기타분포식전원역변기지간적협조。본문환대각개공제배절적폐배은정성진행분석화삼수설계，병통과방진실험증명료방법적유효성。
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 ) .