Research On Single-Phase Grid-Tied Inverter Forhouse-Hold PV System Without Counter-Current

Energy crisis, environmental pollution and ecological deterioration is a major issue facing humanity in the twenty-first Century, the development of new energy and renewable energy, has become the consensus of the world. Solar photovoltaic power generation technology after decades of development, has made considerable progress, the photovoltaic power generation system mainly adopts an upstream. With the increase of house-hold type photovoltaic power generation system of permeability, the negative impact on the power quality and reliability of distribution network will become increasingly apparent, the current mode is a better choice.Without counter-current, photovoltaic grid connected power generation is a novel method for solar energy utilization. House-hold without counter-current, photovoltaic system is composed of power generation unit with MPPT function, energy storage unit with energy management function, single phase grid connected inverter unit and local load cell. Multifunctional grid connected photovoltaic inverter is the current trend of development, through developing the function of APF, not only improve the utilization of the device, can effectively reduce the total cost of the system, the space for equipment.Implementation of single phase grid connected inverter of house-hold non current photovoltaic system includes the generation of instruction current and the control of the output current. The single-phase grid connected inverter is equivalent to a controlled current source, and the active current is controlled by the energy management of the energy storage unit. The harmonic and reactive current are controlled by the local load and the harmonic and reactive current of the distribution network. This paper in single-phase APF based on dq transformation of harmonic and reactive current detection method based on the proposed a new reference current operation method, which can not only realize no current photovoltaic grid connected power generation can achieve harmonic suppression and reactive power compensation. The output current is controlled by using the method of classical feedback and voltage feed forward.Using the MATLAB/Simulink system model is established, under various working conditions in the simulation analysis, to verify the effectiveness of instruction signal operation method and control method. On the basis of the development of a prototype of the 3kW capacity of the control system using TMS320F28335 based on DSP, completed the main circuit, control circuit, drive prototype design and debug circuit, protection circuit. Experiments were carried out under various working conditions, verify the effectiveness of no current control.