Enhanced Control Strategy for Single-Phase Grid-Tie Inverter with Repetitive Learning Controller
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Date
2024
Authors
Yahya Naser
Hassan Bargouth
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Abstract
Photovoltaic (PV) power being supplied to the utility grid is becoming increasingly popular as
the world’s power demand continues to rise. Solid-state inverters are the key technology that
enables the integration of PV systems into the grid. Inverters are used to convert the DC voltage
obtained from the PV system to AC voltage, which is then fed to the grid. Hysteresis control is
typically used to control the inverter to regulate the real and reactive power injected from the
PV into the grid. However, in this project, the real and reactive power will be controlled using
a different technique, namely the PI controller in addition to the repetitive controller. The
repetitive controller will compensate for any errors introduced by the PI controller in tracking
the sinusoidal reference, as shown in Figure 1.
Figure 1: PV multi-level-based Grid
The project will first be simulated in MATLAB Simulink. The hardware components include
a microcontroller, current, voltage sensors, H-bridge, and transformer to implement both the
PI and the repetitive controllers, in addition to generating a PWM signal to the H-bridge to
control the injection of real and reactive power into the grid.