Research on Hybrid Voltage-Power Switching Control Strategy of Grid-Connected Two-Stage Photovoltaic System for Low Voltage Ride Through Faults
Also Available Domains DC - DC Converters|DC - AC Converters
Objective
The main objective of this paper is improving the Low Voltage Ride Through (LVRT) performance of a grid-connected two-stage PV system. It uses a hybrid control strategy that combines voltage and power control. This helps to keep the system stable and balanced during faults. It also ensures better fault handling and meets standards of the grid.
Abstract
This paper analyzes for two-stage grid-connected photovoltaic (PV) system, if the low voltage ride through (LVRT) faults occur in the grid side, because the grid voltage falls to a relative low value and the output current is limited, then the output power of inverter reduces and the dc bus voltage fluctuates, which leads the instantaneous dc bus voltage higher than the normal voltage and brings overvoltage breakdown risk. To solve the above problem, in this paper, a hybrid voltage-power switching control strategy for two-stage grid-connected PV system is proposed. If the grid voltage is normal, the dc-dc stage works in maximum power point tracking (MPPT) mode, and the inverter works in double-loop control (DLC) mode. If the LVRT fault occurs in grid side, the dc-dc stage switches from MPPT mode to voltage control mode, and the inverter switches from DLC mode to single-voltage-loop control (SVL) mode, that is to say, the two stages switch to voltage control mode to stabilize the dc bus voltage.
Keywords: PV System, Boost Converter, Inverter, Filter, PI Controller, Mppt.
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Block Diagram
Specifications
Software Configuration:
Operating System : Windows 7/8/10
Application Software: Matlab/Simulink
Hardware Configuration:
RAM : 8 GB / 4 GB (Min)
Processor : I3 / I5 (Mostly prefer)
Learning Outcomes
· Introduction to Matlab/Simulink
· What is EISPACK & LINPACK
· How to start with MATLAB
· About Matlab language
· About tools & libraries
· Application of Matlab/Simulink
· About Matlab desktop
· Features of Matlab/Simulink
· Basics on Matlab/Simulink
· Introduction to power electronics
· Design of power electronic devices
· Introduction to Hybrid control strategy
· Introduction to Filters
· Introduction to Photovoltaic
· Design of Grid
· Introduction to Maximum power point tracking
· Project Development Skills:
o Problem analyzing skills
o Problem solving skills
o Creativity and imaginary skills
o Programming skills
o Deployment
o Testing skills
o Debugging skills
o Project presentation skills
o Thesis writing skills
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