带自适应估计器的微电网逆变器跟踪控制  

Tracking control strategy for microgrid inverter with adaptive estimator

作　　者：闫士杰[1] 闫伟航 高文忠[2] 

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819 [2]丹佛大学电气和计算机工程系,美国丹佛80208

出　　处：《电机与控制学报》2016年第11期10-17,共8页Electric Machines and Control

基　　金：国家自然科学基金(61428301)

摘　　要：针对电压型微电网逆变器接入本地非线性负载产生输出电压波形畸变问题,提出一种基于自适应估计器的微电网逆变器跟踪控制策略。在该控制策略中,构造一个自适应估计器,用它来估算出因各种扰动产生的微电网逆变器电压降,并进行前馈补偿,求出逆变器的电压控制矢量。为了实现对微电网电压的实时跟踪,引入虚拟阻抗概念,将谐波压降、滤波器电感和电阻参数变化以及各种外部扰动等产生的压降等效成虚拟阻抗上产生的压降。以此为基础,估算出相关的等效虚拟阻抗,并修改自适应估计器中的参数,提高逆变器输出电压波形质量。在各种负载条件下进行了仿真和实验,取得了良好的控制效果。Output voltage waveform of microgrid inverter is distorted when a local nonlinear load is con- nected. In order to solve this problem, a tracking control strategy was presented based on adaptive esti- mator for microgrid inverter. In this control strategy, an adaptive estimator was constructed to estimate voltage drops of microgrid inverter due to all kinds of disturbance. Then these voltage drops were used as feed-forward compensation, and voltage control vector of inverter was obtained. To achieve the real-time tracking of microgrid voltage, the concept of virtual impedance was introduced and some voltage drops are equivalent to voltage on the virtual impedance. These voltage drops may be generated by harmonics, in- ductor and resistor parameters variation on the filter, or a variety of external disturbance. On this basis, relative to harmonics or disturbances, the system estimates these equivalent virtual impedances to modify parameter of adaptive estimator. Therefore, the quality of waveform of the inverter output voltage is im- proved. The simulation and experiment which were carried out under various loads and the good control effect was achieved.

关 键 词：微电网逆变器 自适应估计器 虚拟阻抗 非线性负载 跟踪控制 

分 类 号：TM464[电气工程—电器]