Abstract
This paper presents modeling and controllers design for a photovoltaic (PV) inverter with AC side power decoupling strategy. A small-signal model which includes common mode and differential mode signals is derived from the state-space equations of the modified H-bridge inverter. Based on the model, two controllers are designed to control differential mode voltage and current to eject sinusoidal current into the grid. The power decoupling strategy is achieved by a controller which regulates the common mode voltage of two capacitors placed on the AC side. Simulation studies verified that a 12.7 mF DC link capacitor in 1 kW inverter can be reduced to $120 \boldsymbol{\mu}\mathbf{F}$ while maintaining 0.3% voltage ripple. Experimental results further validate the effectiveness of three developed controllers, i.e., the total harmonic distortion of the output current (THDi) and ripple of DC link voltage are controlled below 3.5% and 4.6%, respectively. Compared to H-bridge inverter which uses a $1360 \boldsymbol{\mu}\mathbf{F}$ electrolytic capacitor on the DC link, a $120 \boldsymbol{\mu}\mathbf{F}$ film capacitor is used in the modified H-bridge inverter so that the reliability of the inverter has been further increased.
Sign-in/Register to access full text options 
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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
