The invention provides a three-level
Z source wind power generation grid-connected
system, and belongs to the field of
wind power generation. The three-level
Z source wind power generation grid-connected
system comprises a duplex winding
vertical axis wind power generator, an unloading protection unit, a first uncontrolled rectification unit, a second uncontrolled rectification unit, a
Z source impedance network, a midpoint clamping three-level
inverter, a grid-connected current sampling unit, a filter
inductor L<f>, a grid-connected
voltage sampling unit, a Z network
voltage sampling unit, a
direct current bus voltage detecting unit, a bidirection DC / DC conversion unit, a charging current detecting unit and a storage
battery pack. According to the three-level Z source
wind power generation grid-connected
system, wind energy is converted into
power frequency alternating current through the three-level
Z source inverter, the
power frequency alternating current is connected into a
power grid, and working
modes are changed over in real time on the condition of different wind speeds. When the wind energy is abundant, the system is connected to the
power grid and also charges the storage
battery pack, and the energy is stored; when the wind energy is moderate, the system only conducts grid-connected operation; when the
wind speed is relatively low, the system is supplied with
electricity by the storage
battery pack to conduct the grid-connected operation, and therefore
new energy wind power generation and use thereof are realized. The three-level Z source
wind power generation grid-connected system is suitable for a small and medium size duplex winding
vertical axis wind power generator unit.