Abstract
The modification of the proportional–integral (PI) controller with the variable proportional constant for tracking of the grid-connected photovoltaic microinverter output current has been proposed. The obtained results show that in the case when the proportional constant of the PI controller varies in time according to the appropriate law, the microinverter output current sinus shape distortions decrease as compared to the case when the ordinary PI controller is used. The operation of the microinverter with the proposed controller was investigated for the cases when the electrical grid voltage sinus shape is not distorted and when it is distorted by the higher harmonics.
Highlights
Microinverters are designed for a single photovoltaic module with a power of 50–350 W and are increasingly used to convert the photovoltaic energy into the standard power grid energy in small scale grid-connected residential applications [1,2]
It is important to keep the shape of the grid-connected photovoltaic inverter output current as close as possible to the sinus to minimize the generation of higher harmonics [4,5,6,7]
The authors of this work have found that when the proportional constant of the PI controller varies in time according to a certain law, the microinverter output current sinus shape distortions decrease as compared to the case when the ordinary PI controller is used
Summary
Microinverters are designed for a single photovoltaic module with a power of 50–350 W and are increasingly used to convert the photovoltaic energy into the standard power grid energy in small scale grid-connected residential applications [1,2]. The novelty of this work is that a new modification of the PI controller with the variable proportional constant for tracking of the grid-connected photovoltaic microinverter output current has been proposed. This controller provides more effective suppression of higher harmonics as compared to ordinary PI controller. The purpose of the control system is to form the pulse width modulation (PWM) signals for the control of the microinverter switches in such a way that the shape of the output current of the inverter would be as close as possible to the sinus.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
