A Novel Circuit Configuration for The Integration of Modular Multilevel Converter with Large-Scale Grid-Connected PV Systems

Northwest China is an ideal region for large-scale grid-connected PV system installation due to its abundant solar radiation and vast areas. For grid-connected PV systems in this region, one of the key issues is how to reduce the shading effect as much as possible to maximize their power generation. In this paper, a shading simulation model for PV modules is established and its reliability is verified under the standard testing condition (STC) in laboratory. Based on the investigation result of a 20 MWp grid-connected PV plant in northwest China, the typical shading phenomena are classified and analyzed individually, such as power distribution buildings shading and wire poles shading, plants and birds droppings shading, and front-row PV arrays shading. A series of experiments is also conducted on-site to evaluate and compare the impacts of different typical shading forms. Finally, some feasible solutions are proposed to avoid or reduce the shading effect of PV system during operation in such region.

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Large Scale Grid Integration of Renewable Energy Sources

10.1049/pbpo098e ◽

2017 ◽

Cited By ~ 2

Keyword(s):

Renewable Energy ◽

Large Scale ◽

Renewable Energy Sources ◽

Energy Sources ◽

Grid Integration ◽

Large Scale Grid ◽

Scale Grid

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Comparison of Modulation and Power Control between Modular Multilevel Converter based Large Scale Battery Energy Storage System and MMC-HVDC

8th Renewable Power Generation Conference (RPG 2019) ◽

10.1049/cp.2019.0379 ◽

2019 ◽

Author(s):

S. Ali ◽

Kai Tian ◽

Zhong Huang ◽

Zhibin Ling

Keyword(s):

Energy Storage ◽

Power Control ◽

Large Scale ◽

Storage System ◽

Energy Storage System ◽

Modular Multilevel Converter ◽

Multilevel Converter ◽

Battery Energy Storage System ◽

Battery Energy Storage ◽

Battery Energy

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Reliability Analysis and Repair Activity for the Components of 350 kW Inverters in a Large Scale Grid-Connected Photovoltaic System

Electronics ◽

10.3390/electronics10050564 ◽

2021 ◽

Vol 10 (5) ◽

pp. 564

Author(s):

Filippo Spertino ◽

Angela Amato ◽

Gabriele Casali ◽

Alessandro Ciocia ◽

Gabriele Malgaroli

Keyword(s):

Reliability Analysis ◽

Large Scale ◽

Photovoltaic System ◽

Component Level ◽

Ac Power ◽

Repair Activity ◽

Industrial Maintenance ◽

Large Scale Grid ◽

Ac Converters ◽

Scale Grid

The reliability of photovoltaic (PV) generators is strongly affected by the performance of Direct Current/Alternating Current (DC/AC) converters, being the major source of PV underperformance. However, generally, their reliability is not investigated at component level: thus, the present work presents a reliability analysis and the repair activity for the components of full bridge DC/AC converters. In the first part of the paper, a reliability analysis using failure rates from literature is carried out for 132 inverters (AC rated power of 350 kW each) with global AC power of 46 MW in a large scale grid-connected PV plant. Then, in the second part of the work, results from literature are compared with data obtained by analyzing industrial maintenance reports in the years 2015–2017. In conclusion, the yearly energy losses involved in the downtime are quantified, as well as their availability.

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