Mechanism Analysis of Voltage Quality Deterioration for Grid-Connected Photovoltaic System and Improvement Strategy

作者：Liu, Dong^*; You, Yi; Liao, Huaiqing; Huang, Yuhui

来源：International Review of Electrical Engineering, 2012, 7(2): 4221-4225.

• Grid-Connected Photovoltaic System
• Power Quality
• Mechanism Analysis
• Voltage Quality Deterioration
• Equivalent Load Impedance

Nowadays, not only independent Photovoltaic (PV) system but also large-scale grid-connected PV system (GCPVS) have been widely used, due to the advantages of clean and renewable solar energy. However, the intermittence of solar energy could significantly affect the power quality of distribution network with the implementation of large-scale GCPVS. This paper focuses on the mechanism analysis of voltage quality deterioration for GCPVS and the corresponding voltage quality improvement measurements. The mathematical model of GCPVS, including PV Array, inverter devices, filtering circuit and the distribution network with GCPVS interconnected are discussed in detail. Based on the analysis of the inverter control mode of GCPVS, the mechanism that equivalent load impedance characteristic of GCPVS resulting in voltage quality deterioration superimposition effect has been exposed. Voltage sag in Point of Common Coupling (PCC) will lead to the change of equivalent load impedance of GCPVS, accordingly deteriorating voltage quality in PCC flirt her. Additionally, some effective measurements are put forward to improve voltage quality caused by the mechanism aforementioned.

• 出版日期2012-4
• 单位上海交通大学