Maliarenko I. Operating modes and characteristics of semiconductor converters in series photovoltaic systems

The object of study - the conversion process of electric energy in series photovoltaic systems. The purpose of research - to create a series photovoltaic systems and research of operating modes and characteristics of semiconductor converters. Methods and equipment - the theory of electrical circuits, linear and nonlinear pulse systems, differential and algebraic equations, harmonic analysis method, numerical integration and differentiation methods. Theoretical and practical results: a new structure of series photovoltaic system using individual matching converters and current source inverter for connection to three-phase power grid was created and justified, a control method for matching converters using output voltages that allow eliminate the output sensors of solar panels was developed, the calculation method of basic parameters for series photovoltaic system was developed, the method of power ripple correction in DC link of current source inverter was developed . Scientific novelty: a model of series photovoltaic system was improved, an indirect method of maximum power point tracking of solar panels was firstly proposed, a control method of three-phase current inverter with sinusoidal PWM has been further developed. Implementation: Ltd. "ALT LASER" (c. Kharkiv) and in the educational process of the department of industrial and biomedical electronics NTU "KhPI". Scope of use: designing of semiconductor converters and renewable energy systems