scholarly journals Optimization The Performance of a Synchronization Controller For a 3-Phase Photovoltaic Grid-Connected System

2018 ◽  
Vol 9 (2) ◽  
pp. 622
Author(s):  
Bennis Ghita ◽  
Karim Mohammed ◽  
Lagrioui Ahmed
Keyword(s):  
Distributed Generation ◽  
Power Factor ◽  
Low Voltage ◽  
Photovoltaic System ◽  
Generation System ◽  
Synchronization Algorithm ◽  
Utility Grid

In a distributed generation system, divers renewable agents are connected to the low voltage 3 phase utility grid by an inverter which is used as power condition and must assurance the higher efficiency of the renewable agent. To achieve this level of efficiency, a unitary power factor between the utility grid voltages and the inverter currents is necessary, and a synchronization algorithm is required for the perfect synchronization between the 3-phase utility grid and the renewable agent. The aim of this paper is to present the optimization of the performance of a Synchronization controller for a 3-phase photovoltaic grid-connected system, assessing its accuracy under different conditions and studying their drawbacks and advantages. A grid connected photovoltaic system with a nominal power of 5 kW is used so as to assess the behavior of the synchronization algorithm when the 3 phase utility grid is affected by some disturbances such as voltage unbalances.

Integrated planning of low-voltage power grids and subsidies toward a distributed generation system – Case study of the diffusion of photovoltaics in a Japanese dormitory town

Energy ◽  
2017 ◽  
Vol 140 ◽  
pp. 779-793 ◽  
Author(s):  
Yutaka Nomaguchi ◽  
Hiroki Tanaka ◽  
Akiyuki Sakakibara ◽  
Kikuo Fujita ◽  
Yusuke Kishita ◽  
...  
Keyword(s):  
Distributed Generation ◽  
Low Voltage ◽  
Power Grids ◽  
Integrated Planning ◽  
Generation System

scholarly journals Theoretical and Experimental Study to Determine Voltage Violation, Reverse Electric Current and Losses in Prosumers Connected to Low-Voltage Power Grid

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4568 ◽  
Author(s):  
Torres ◽  
Negreiros ◽  
Tiba
Keyword(s):  
Distributed Generation ◽  
Challenging Behavior ◽  
Power Flow ◽  
Low Voltage ◽  
Electricity Consumption ◽  
Reverse Current ◽  
Operating Conditions ◽  
Photovoltaic System ◽  
Electricity Cost ◽  
The Impact

The impact of PV generation distributed in a low voltage transmission line depends on many factors: The distribution lines and PV generators characteristics, its location, operational control, local meteorological conditions, electricity consumption profile, and the electricity cost variation. An atypical and challenging behavior of photovoltaic distributed generation (DG) insertion in consumer units (CUs), implies in some circumstances, as the reverse directionality of the power flow between the load equipped with a photovoltaic system generator and the electrical grid, when a CU contains a distributed generation and low power consumption, the power flow will be directed to the power electric grid. In this work, the modeling of a low-voltage real feeder was performed, setting the variables of the system under real operating conditions. As result, voltage levels variability throughout the feeder, the electrical losses, and the asymmetry between the phases were observed. Through simulation scenarios, the occurrence of voltage increase under different penetration scenarios of distributed generation was verified and there was a 10% increase in reference voltage as well as the occurrence of higher electrical losses by reverse current, reaching 1200% more with a DG penetration, in the massive presence of the photovoltaic generator. The mitigatory action used in this work was able to attenuate the negative impacts to the feeder circuit, ensuring the integrity grid and the consumer unit.

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