Low Voltage Ride through Control Capability of a Large Grid Connected PV System Combining DC Chopper and Current Limiting Techniques

• 作者: Karim H. M. Youssef Nabil H. Abbasy Ronald Ntare
• 来源期刊: 电力能源(英文)
• 学科: 医学
• 关键词: GRID CONNECTED PHOTOVOLTAIC (PV) Power Plants (GCPSs) VOLTAGE Dips Low VOLTAGE RIDE Through (LVRT) GRID Code (GC)
• 年，卷（期）: 2019,（1）
• 页码范围: 62-79
• 页数: 18页
• 分类号: R73

摘要

This paper presents the development and performance capability of a comprehensive Low voltage ride through (LVRT) control scheme that makes use of both the DC chopper and the current limiting based on the required reactive power during fault time. The study is conducted on an 8.5 MW single stage PV power plant (PVPP) connected to the Rwandan grid. In the event of fault disturbance, this control scheme helps to overcome the problems of excessive DC-link voltage by fast activation of the DC chopper operation. At the same instance, AC current is limited to the maximum rating of the inverter as a function of the injected reactive current. This helps overcome AC-over- current that may possibly lead to damage or disconnection of the inverter. The control scheme also ensures voltage support and power balance through the injection of reactive current as per grid code requirements. Selected simulations using MATLAB are carried out in the events of different kinds of fault caused voltage dips. Results demonstrate the effectiveness of the proposed LVRT control scheme.