The Control Strategies For Inverter-based Interface Of Grid-connected Photovoltaic System

Along with the rapid development of technology, people pay more and more attention to the problem of energy. It becomes a hot topic that how to exploit and use reproducible resource resolve energy crisis recently. Solar energy as a new resource possess wide prospect.This paper aiming at photovoltaic equipment to grid proposes a new control method of inverter, which can drive equipment to transmit active power and reactive power to grid according to request. Except that integrated learning boost converter control can drive equipment to compensate harmonic. As the same condition of hardware, the function of equipment has been improved. The primary research of this paper list in the following: 1 Proposing new equipment, this equipment can compensatereactive power and harmonic except supplying active power to grid. 2 Regarding PWM voltage inverter as a boost converter, throughanalysis of variable structure theory and integrated learning controltheory, we suggest an integrated learning boost converter control tocomplete power transmission and harmonic compensation.Simultaneity, we do some simulations and experiments. 3^ Regarding AC side of inverter as a virtual AC motor and basedon virtual flux and space vector modulation theory, we suggest directpower control based on virtual-flux without source voltage sensor.Simultaneity, we do some simulations. 4 According to the V-I character of PV arrays, DC-DC converter isadopted to track the maximum power point of the arrays. Theefficiency of PV arrays is improved.The research emphasize on control method of inverter and simulation, using PSCAD software to simulate waveform under different conditions.