Single-Phase Cascaded Inverter for Photovoltaic System
Primary Faculty Mentor’s Name
Dr. Adel El Shahat
Proposal Track
Student
Session Format
Poster
Abstract
This project proposes a model and discusses the design and control issues associated with cascaded inverter for a single-phase grid connected photovoltaic system. The cascaded inverter is chosen because of its ability to produce stepped voltage without using a transformer. It is light, compact, and cheaper (≈25% cheaper) than other multilevel inverters. They also require minimum effort to operate on AC and DC. This system will convert power from DC to AC and will use battery storage for times when solar energy is absent. The cascaded inverter consists of two full bridge topologies and AC outputs in series. Each bridge has the ability to produce three different voltage outputs. In addition to the inverter a low pass filter will also be needed. The low pass filter will assist with eliminating switching ripples involved in the process of switching frequencies. For this photovoltaic design a LCL filter design will be used. This design will also produce better gradual losses in flux intensity ratios even with small C and L values. There will be certain constraints associated with this design such as total per unit inductance, capacitance, and resonant frequency. This design will be carried out with Grid synchronization as an important part due to its importance in the rising number of PV installations due to government and utility company support. A controller will be used on the input side and the grid side; the input side controller’s main objective is to extract the maximum power from the input, and the grid side controller controls the active power, reactive power, and ensures the quality of injected power. We use photovoltaic energy system due to the increasing importance of alternate energy sources research. We model and discuss the design and control issues associated with cascaded inverter for a single-phase grid connected photovoltaic system. The PV important characteristics will be simulated using MATLAB software. The inverter itself implemented with the aid of MATLAB/Simulink. The results show excellent performance of this type of inverters.
Keywords
Photovoltaic, MATLAB, cascaded, inverters, grid
Award Consideration
1
Location
Concourse and Atrium
Presentation Year
2015
Start Date
11-7-2015 2:10 PM
End Date
11-7-2015 3:20 PM
Publication Type and Release Option
Presentation (Open Access)
Recommended Citation
Carver, Adam S. and Moore, Anthony L., "Single-Phase Cascaded Inverter for Photovoltaic System" (2015). Georgia Undergraduate Research Conference (2014-2015). 54.
https://digitalcommons.georgiasouthern.edu/gurc/2015/2015/54
Single-Phase Cascaded Inverter for Photovoltaic System
Concourse and Atrium
This project proposes a model and discusses the design and control issues associated with cascaded inverter for a single-phase grid connected photovoltaic system. The cascaded inverter is chosen because of its ability to produce stepped voltage without using a transformer. It is light, compact, and cheaper (≈25% cheaper) than other multilevel inverters. They also require minimum effort to operate on AC and DC. This system will convert power from DC to AC and will use battery storage for times when solar energy is absent. The cascaded inverter consists of two full bridge topologies and AC outputs in series. Each bridge has the ability to produce three different voltage outputs. In addition to the inverter a low pass filter will also be needed. The low pass filter will assist with eliminating switching ripples involved in the process of switching frequencies. For this photovoltaic design a LCL filter design will be used. This design will also produce better gradual losses in flux intensity ratios even with small C and L values. There will be certain constraints associated with this design such as total per unit inductance, capacitance, and resonant frequency. This design will be carried out with Grid synchronization as an important part due to its importance in the rising number of PV installations due to government and utility company support. A controller will be used on the input side and the grid side; the input side controller’s main objective is to extract the maximum power from the input, and the grid side controller controls the active power, reactive power, and ensures the quality of injected power. We use photovoltaic energy system due to the increasing importance of alternate energy sources research. We model and discuss the design and control issues associated with cascaded inverter for a single-phase grid connected photovoltaic system. The PV important characteristics will be simulated using MATLAB software. The inverter itself implemented with the aid of MATLAB/Simulink. The results show excellent performance of this type of inverters.
