Modeling and Multivariable Analysis of a Two-Stage Three-Phase Grid-Connected Inverter for Photovoltaic Systems

This article presents an approach to modelling and analyzing photovoltaic inverters through the use of multivariable techniques. By applying singular value decomposition and relative gain array methodologies, the inverter can be viewed as a multiple-input multiple-output system, allowing for a comprehensive assessment of the relevant variables that require control within a specific frequency range. This advanced approach offers a deeper understanding of the complex interactions between the different components of the photovoltaic inverter, enabling more effective control over critical parameters.