| Abstract [eng] |
This master's thesis comprehensively investigates various photovoltaic inverter three-phase output voltage forming methods and voltage control algorithms, focusing on their performance in terms of transient response, voltage and current THD, adaptability, and phase correction. The investigation was performed using MATLAB/Simulink software, when photovoltaic inverter operates in off grid and on grid modes for the cases when inverter load is linear and non-linear. The majority of thesis is devoted to investigation of the inverter voltage forming method based on the Sinusoidal Pulse Width Modulation (SPWM) without output voltage feedback control and using output voltage control algorithms as closed Loop Feedback, PI PLL, and two suggested PLL simplification, Acos PLL and Atan2 PLL. Additionally, the photovoltaic inverter voltage forming method based on the Hysteresis Current Control (HCC) was investigated. Finally, the Hysteresis Voltage Control (mHVC) method, which is a suggested modification of HCC, was proposed and investigated and its advantages and drawbacks have been demonstrated. |
