Sensor Malfunction Detection and Mitigation Strategy for a Multilevel Photovoltaic Converter
Sensor Malfunction Detection and Mitigation Strategy for a Multilevel Photovoltaic Converter
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DOI：
10.1109/tec.2020.2973421
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发表时间：
2020-06
影响因子：
4.9
通讯作者：
A. Teymouri;A. Mehrizi‐Sani
中科院分区：
文献类型：
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作者：
A. Teymouri;A. Mehrizi‐Sani
基于级联H桥（CHB）的转换器具有若干优点，包括模块化、隔离DC侧电压和改善的输出电压质量。这些多电平转换器越来越多地用于光伏（PV）系统中。随着H桥子模块（SM）和传感器的数量由于级联拓扑而增加，转换器变得更容易发生传感器故障。本文提出了一种方法，使CHB为基础的光伏转换器弹性传感器故障使用实时状态估计为基础的故障检测算法。所提出的方法进行了验证，在MATLAB/SIMULINK的仿真研究和测试系统上的实验研究。结果表明，一个九级CHB为基础的光伏系统可以正常运行，即使当一个传感器测量丢失。
Cascaded H-bridge (CHB) based converters have several advantages including modularity, isolated DC-side voltage, and improved output voltage quality. These multilevel converters are increasingly used in photovoltaic (PV) systems. With the number of H-bridge submodules (SM) and sensors increased due to the cascaded topology, the converter becomes more prone to sensor malfunctions. This article proposes a method to make a CHB-based PV converter resilient to sensor malfunctions using a real-time state estimation–based malfunction detection algorithm. The proposed method is validated using simulation studies in MATLAB/SIMULINK and experimental studies on a test system. It is shown that a nine-level CHB-based PV system can operate normally even when one sensor measurement is missing.