Online Two-Section PV Array Fault Diagnosis With Optimized Voltage Sensor Locations
Online Two-Section PV Array Fault Diagnosis With Optimized Voltage Sensor Locations
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DOI：
10.1109/tie.2015.2448066
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发表时间：
2015-11-01
影响因子：
7.7
通讯作者：
Kirtley, James L., Jr.
中科院分区：
文献类型：
--
作者：
Hu, Yihua;Zhang, Jiangfeng;Kirtley, James L., Jr.
太阳能光伏发电站是世界上广泛使用的直接利用太阳能的发电站。为了降低投资和运营成本，早期故障诊断通过使光伏阵列能够长期有效运行而发挥着越来越重要的作用。本文分析了故障光伏串和阵列的端部特性，提出了一种光伏阵列故障诊断技术。将故障光伏阵列的终端电流-电压曲线分为两段，高压和低压故障诊断部分。然后针对每个区段分析健康串模块的对应工作点以及不健康串中的健康和故障模块的对应工作点。通过探测不同的工作点，可以定位有故障的光伏组件。故障信息对于最大功率点跟踪和阵列动态重构具有重要意义。此外，可以消除串电流传感器，并且可以通过优化电压传感器位置来减少电压传感器的数量。典型的故障情况下，包括单串，多串，和一个1.6千瓦的3 × 3光伏阵列的部分阴影和实验测试，以确认所提出的故障诊断方法的有效性。
Photovoltaic (PV) stations have been widely built in the world to utilize solar energy directly. In order to reduce the capital and operational costs, early fault diagnosis is playing an increasingly important role by enabling the long effective operation of PV arrays. This paper analyzes the terminal characteristics of faulty PV strings and arrays, and it develops a PV array fault diagnosis technique. The terminal current-voltage curve of a faulty PV array is divided into two sections, i.e., high-voltage and low-voltage fault diagnosis sections. The corresponding working points of healthy string modules and of healthy and faulty modules in an unhealthy string are then analyzed for each section. By probing into different working points, a faulty PV module can be located. The fault information is of critical importance for the maximum power point tracking and the array dynamical reconfiguration. Furthermore, the string current sensors can be eliminated, and the number of voltage sensors can be reduced by optimizing voltage sensor locations. Typical fault scenarios including monostring, multistring, and a partial shadow for a 1.6-kW 3 x 3 PV array are presented and experimentally tested to confirm the effectiveness of the proposed fault diagnosis method.