Seven-level grid-connected packed U-cells inverter using photovoltaic generators system

2021 ◽  
pp. 095965182098795
Author(s):  
Alaeddine Ben Zid ◽  
Abdessalem Lamari ◽  
Faouzi Bacha
Keyword(s):  
Input Voltage ◽  
Point Of View ◽  
Photovoltaic System ◽  
System Control ◽  
Active Components ◽  
Central Type ◽  
Point Tracking ◽  
Three Phase ◽  
Controller Board ◽  
Photovoltaic Generators

In this article, one of the most recent multilevel converter topologies named packed U-cells is developed for three-phase grid-connected inverter mode using photovoltaic input voltage sources. This topology makes a very important research subject in what concerns the adaptation of multilevel inverters with photovoltaic systems. According to the literature, it is well applicable with the string type and suitable for high-voltage applications because the number of switches is less than conventional topology and maximum blocking voltage is Udc and 2 Udc; however, it is not applicable for multistring type and unsuitable for the central type because it is based on isolated DC source. The packed U-cells topology is highly optimized from the point of view of the number of passive and active components. The output voltages of our converter are composed by seven levels obtained by the auxiliary buses voltages regulation. In order to obtain the DC input voltages of 120 V for the inverter, photovoltaic generators are connected to a boost converters. The maximum power point tracking method based on the Perturb and Observe was used to improve and optimize the performance of the photovoltaic system control in the simulation part. The grid-connected PUC7 inverter operates with a unit power factor and injects active power into the grid. The control is configured to make the current waveform in phase with the AC voltage waveform. Reference angle variations have been made to operate with different power factors to test the performance of the applied control and the influence of these variations on the auxiliary buses voltages regulation. The simulations were done under Matlab/Simulink platform and have been experimentally verified using dSpace 1104 controller board and three-phase packed U-cells inverter composed by nine half-bridge insulated-gate bipolar transistor modules.

scholarly journals Hardware in the Loop Platform for Testing Photovoltaic System Control

2020 ◽  
Vol 10 (23) ◽  
pp. 8690
Author(s):  
Víctor Samano-Ortega ◽  
Alfredo Padilla-Medina ◽  
Micael Bravo-Sanchez ◽  
Elías Rodriguez-Segura ◽  
Alonso Jimenez-Garibay ◽  
...  
Keyword(s):  
Control Systems ◽  
Operating Conditions ◽  
Real System ◽  
Photovoltaic System ◽  
Hill Climbing ◽  
Integration Time ◽  
System Control ◽  
Hardware In The Loop ◽  
The Real ◽  
Point Tracking

The hardware in the loop (HIL) technique allows you to reproduce the behavior of a dynamic system or part of it in real time. This quality makes HIL a useful tool in the controller validation process and is widely used in multiple areas including photovoltaic systems (PVSs). This study presents the development of an HIL system to emulate the behavior of a PVS that includes a photovoltaic panel (PVP) and a DC-DC boost converter connected in series. The emulator was embedded into an NI-myRIO development board that operates with an integration time of 10 µs and reproduces the behavior of the real system with a mean percent error of 2.0478%, compared to simulation results. The implemented emulator is proposed as a platform for the validation of control systems. With it, the experimental stage is carried out on two controllers connected to the PVS without having the real system and allowing to emulate different operating conditions. The first controller is based on the Hill Climbing algorithm for the maximum power point tracking (MPPT), the second is a proportional integral (PI) controller for voltage control. Both controllers generate settling times of less than 3 s; the MPPT controller generates variations in the output in steady state inherent to the algorithm used. For both cases, the comparison of the experimental results with those obtained through software simulation show that the platform fulfills its usefulness when evaluating control systems.

The Control Strategy and Simulation of Three-Phase Grid-Connected Photovoltaic System

2012 ◽  
Vol 608-609 ◽  
pp. 164-168
Author(s):  
Jian Jun Su ◽  
Men Yue Hu ◽  
Hong Yan Gong ◽  
Hai Tao Sun ◽  
Zhi Jian Hu ◽  
...  
Keyword(s):  
Control Strategy ◽  
Photovoltaic System ◽  
Current Loop ◽  
Maximum Power Point ◽  
Loop Control ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Three Phase ◽  
Power Point ◽  
Research Situation

Firstly the research situation for grid-connected photovoltaic (PV) is introduced, then, the engineering mathematical model of PV cells is introduced. The perturbation and observation algorithm is chosen as the maximum power point tracking (MPPT) algorithm. The SPWM double-loop control strategy with outer voltage loop and inner current loop is described and a three-phase grid-connected photovoltaic model is established. The simulation results demonstrate the validity and correctness of the simulation model built in this paper.

scholarly journals MATHEMATICAL MODELLING AND SIMULATION OF GRID CONNECTED SOLAR PHOTOVOLTAIC SYSTEM

2014 ◽  
pp. 195-199
Author(s):  
K. N. DINESH BABU ◽  
R. RAMAPRABHA ◽  
V. RAJINI
Keyword(s):  
Reactive Power ◽  
Photovoltaic System ◽  
Modulation Index ◽  
Maximum Output ◽  
Solar Photovoltaic ◽  
Point Tracking ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Power Point ◽  
Solar Photovoltaic System

This paper presents the mathematical modeling of three-phase grid connected inverter fed by Solar Photovoltaic (SPV) system with Maximum Power Point Tracking (MPPT). Analysis has been carried out to choose the proper modulation index for maximum output for three-phase inverter. With this modulation index, the variation of the active and reactive power for different loads has been presented along with major parameters like Transfer ratio and Efficiency. Also the Real and Reactive power output of the SPV has been measured with various solar Radiation levels.

scholarly journals Simulation of Standalone Three-Phase Photovoltaic System with SPWM and SVPWM Techniques

2020 ◽  
Vol 9 (4) ◽  
pp. 2208-2215
Keyword(s):  
Maximum Power Point Tracking ◽  
Maximum Power ◽  
Photovoltaic System ◽  
Voltage Source ◽  
Photovoltaic Module ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Three Phase ◽  
Power Point

Maximum power point tracking is a method employed to produce the utmost power available from the photovoltaic module. To date, many algorithms for maximum power point tracking technique had been stated, every with its own capabilities. In this paper, a Luo converter with high-voltage conversion gain is employed to track photovoltaic panels at maximum power and to step up the voltage to a higher level. This work also aims to validate the performance of the maximum power point tracking system with Luo converter which utilizes incremental conductance techniques. Space vector modulation and sinusoidal pulse width modulations are the control techniques employed to control the three-phase voltage source converter. In order to measure the overall performance indices of the proposed system, a simulation is carried out in MATLAB / Simulink environment.

scholarly journals Equivalent Model of a Three Phase System of Photovoltaic Generation to Analyze Voltage Variations in a Radial Distribution System

2020 ◽  
Vol 25 (2) ◽  
pp. 205-215
Author(s):  
Juan Camilo Toro-Cadavid ◽  
Carlos Andrés Ramos-Paja ◽  
Andrés Julián Saavedra-Montes
Keyword(s):  
Radial Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Single Phase ◽  
Parameters Estimation ◽  
Photovoltaic System ◽  
Photovoltaic Generation ◽  
Radial Distribution System ◽  
Three Phase ◽  
Photovoltaic Generators

In this paper, the modelling of a three-phase photovoltaic system, for analyzing voltage variation in a radial distribution system, is presented. The radial distribution system is represented by a benchmark which is widely used in the analysis of distribution systems with distributed generation, and electrical microgrids. The parameters estimation of this model is performed by selecting the aerial distribution of conductors and then calculating the sequence components. Moreover, a model of a three-phase photovoltaic generation system for analyzing voltage variations is proposed. The model represents an array of photovoltaic panels, a dc/dc converter with its control system, and a three-phase inverter. The software MATLAB/Simulink is chosen to simulate both the distribution and the photovoltaic systems. All the components of the three-phase photovoltaic system are parametrized with information of commercial equipment. To facilitate the implementation of the system model in the analysis program, reduced models of its components are selected. Finally, the proposed model of the three-phase photovoltaic system is validated by simulating single-phase faults along the feeder and changes of irradiance over the photovoltaic generators and observing the voltage behavior in one node of the distribution system. The results show that irradiance changes and single-phase faults affect the voltage behavior depending on the photovoltaic penetration level and the generators location.

scholarly journals Duty cycle and radiation estimates using maximum load transfer point for optimization of a 100KVA photovoltaic system

2020 ◽  
Vol 14 (2) ◽  
pp. 171-176
Author(s):  
Sergio Alejandro Terán Rodríguez ◽  
Franklin Jonathan Rojas Caicedo ◽  
Esteban Mauricio Inga Ortega
Keyword(s):  
Duty Cycle ◽  
Load Transfer ◽  
Maximum Load ◽  
Maximum Power ◽  
Photovoltaic System ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Point Tracking ◽  
Incremental Conductance ◽  
Three Phase

In this document, the variation of temperature and radiation in a 100 kW photovoltaic assembly is connected to a 25 kV network through a DC-DC booster converter and a three-phase three-phase voltage source converter (VSC). Maximum power point tracking (MPPT) is implemented in the elevator converter using a Simulink® model that uses the technique of 'Incremental Conductance + Integral Regulator'. The switching duty cycle is optimized by an MPPT controller that uses the technique of 'Incremental Conductance + Integral Regulator'. This MPPT system automatically modifies the duty cycle to generate the voltage required to extract the maximum power.

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