Passivity-Based Control for Photovoltaic Inverters Considering Parameters Uncertainties and Disturbances

Photovoltaic power generation is widely recognized for its clean, pollution-free, mature technology. Its performance is closely related to photovoltaic inverters. Due to the significant temperature changes and substantial electromagnetic interference in the working environment of photovoltaic inverters, time-varying parameters and sampling interference will threaten the stable operation of the inverter. Therefore, this paper proposes a passive control method for photovoltaic inverters with nonlinear state observation, which not only realizes the online observation and elimination of complex influencing factors such as external disturbances, time-varying parameter uncertainty, and modeling errors but also ensures the global stability of the system under various loads. An experimental prototype with a rated power of 3kV A was designed in the laboratory, and the results confirmed the effectiveness of the control strategy and theoretical analysis.