Bombyk V. The control system of grid-tied multilevel voltage invertor

The thesis is devoted to improving the control system grid-tied multilevel voltage inverter while working with solar module and the grid, which allow improving the quality of electricity and increasing the efficiency of the inverter. The work presents the existing control systems of grid-tied multilevel voltage inverter. Such systems are particular analyzed: control systems of multilevel voltage inverter in electric drive, control systems of multilevel voltage inverter with using of maximum power point tracking algorithm by solar module and control systems of grid-tied multilevel voltage inverter of photovoltaic module. Their advantages and disadvantages, the necessity of finding new solutions in this area are shown. Control law for grid-tied multilevel inverter of solar module and modified structure for his realization is created in the thesis. It allows to hold the solar module operation in terms of maximum power point tracking, which increases productivity. An improved model of the longitudinal component of the current controller of the inverter is proposed, which considers current and desired voltage and voltage of the solar modules to optimize the inverter from both sides of the solar module and from the network by voltage. A model of the transverse component of the current controller of the inverter is proposed, which allows a given value of active power and network node set transverse component of the current, which is necessary for the inverter selection in terms of maximum power, allowing you to optimize work of inverter by frequency. A control law of grid-tied multilevel voltage inverter is improved, which takes into account the temperature of the solar module and the environment, and transformers magnetizing current. Based on developed mathematical models, computer models for testing the adequacy of regulators of longitudinal and transverse inverter components were built. Optimal parameters for regulators configuration of control system of grid-tied multilevel voltage inverter were identified. The structure of microprocessor device for control system of grid-tied multilevel voltage inverter of solar module is developed in the thesis, that allows to hold the solar module operation in the selection of maximum power, taking into account the temperature of the solar module. An algorithm that allows to realize different operating modes was developed for this device.