Abstract
A photovoltaic system is one of the major sources of renewable energy. The grid-connected inverter controllers play an important role in the conversion and transmission of solar energy. Therefore, they must be improved to meet the demands for grid interconnection. This article introduces the design and hardware implementation of the intelligent fuzzy-PI controller of the inverter part of the grid-connected photovoltaic system. First, the paper discusses the design of the three-phase grid-connected fuzzy-PI controller. Next, the paper describes the implementation of a Matlab graphical user interface (GUI) to design any grid-connected inverter and size the photovoltaic systems. The code generation of the fuzzy-PI controller of the system is accomplished by using Matlab Simulink simulation software. The hardware components of the PV system are implemented experimentally. In the hardware implementation, a 70 W prototype is realized to test the functionality of the controller, such that one can develop a realistic controller without taking risks or falling into security concerns in the case of performing experiments on high-power systems. The prototype proves that the controller model can be directly transformed from Simulink to the control device. It also shows that the fuzzy-PI controller is working properly in the 70-watt prototype. The achieved performance parameters of the proposed fuzzy-PI controller are satisfactory. The proposed method to design and implement the fuzzy-PI controller does not require complicated programming, where a Matlab coder is proposed to transform the Simulink controller into C code that can be directly utilized as a software control program loaded in the microcontrollers embedded in the hardware of the controller. The main result is that the fuzzy-PI controller for the three-phase grid-connected systems can be implemented using low-cost reconfigurable microcontrollers.
Highlights
Introduction published maps and institutional affilSolar energy is one of the major sources of renewable energy
The system uses graphical user interface (GUI) Matlab software to study the dimensions of inverters, boost converters, and photovoltaic arrays
A design is introduced alongside the hardware implementation of a fuzzy-PI controller for the inverter part of a grid-connected PV system
Summary
Solar energy is one of the major sources of renewable energy. This fact means that converting it into electricity is a very important research topic. A photovoltaic system can be defined as a system used for the transformation of solar energy into electrical energy. High cost and low efficiency are among the defects of photovoltaic systems. This event motivates scientists to investigate how to maximize the efficiency of renewable energy resources. Considerable attention is given to photovoltaic (PV) power generation systems as one of the most promising energy generation systems that can alternate with fossil fuel power generation [1]. It can be seen that the installation of photovoltaic technology is increasing by 20–25%
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