Abstract
In this paper, the synchronous control problem of photovoltaic grid-connected inverter with nonlinear impulse perturbation is studied. The mathematical model of photovoltaic grid-connected converter is established by using Kirchhoff’s law. The nonlinear impulse perturbation characteristics of grid-connected current are studied and analyzed. Controllers are designed to suppress nonlinear impulse perturbation. The effectiveness of the controller is verified by Lyapunov stability theory. Finally, the simulation design is carried out by simulink in Matlab and the test platform is constructed. In this paper, simulation verification and data comparison are carried out by using various control methods for suppressing nonlinear impulse perturbation of grid-connected currents. Compared with PI controller, PR controller and other controller, the output harmonic content of photovoltaic inverter can be controlled within 1%, which can effectively reduce the harmonic content. The power quality of grid-connected current is improved. The feasibility and effectiveness of the control strategy proposed are verified by simulation and experiments.
Highlights
Energy shortage is a major problem in the world, so it is of great significance to study and develop renewable energy power generation system
A current impulse perturbation control algorithm is given to suppress the harmonic current into the power grid, and to ensure that the output current of the photovoltaic inverter can be synchronized with the power grid voltage
The 5th harmonic content is reduced to 0.90%, and the 7th harmonic content is reduced to 0.35%
Summary
Energy shortage is a major problem in the world, so it is of great significance to study and develop renewable energy power generation system. The continuous turn on or turn off of power electronic devices in grid-connected inverters of photovoltaic power generation system has a sudden impact on the current. The most commonly used grid-connected current control method of photovoltaic inverter is PI control based on synchronous rotating coordinate system. The nonlinear impulse perturbation current is common in photovoltaic power generation. Some scholars have studied the influence of nonlinear impulse disturbance on the life of power electronic devices or generator insulation system and the health of grid-connected current in the process of inverter or generator grid-connected [11]. A current impulse perturbation control algorithm is given to suppress the harmonic current into the power grid, and to ensure that the output current of the photovoltaic inverter can be synchronized with the power grid voltage. The feasibility and effectiveness of the control strategy proposed in this paper are verified by simulation and experiments
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