Grid-connected inverter mains impedance detection method and power factor correction method and device
An inverter and electrical impedance technology, which is applied in the control field of photovoltaic inverters, can solve the problems of poor power factor and quality of grid-connected power
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[0171] The control block diagram of the grid-connected inverter mains impedance of the embodiment of the present invention is as follows figure 1 As shown, inverters of other topologies are also applicable. The impedance detection method of the embodiment of the present invention needs active current (ie figure 1 Idref) disturbance and reactive current (ie figure 1 Iqref) disturbance in , where the active current disturbance utilizes the PV voltage on the DC control side (ie figure 1 Vpvref) in the reference disturbance is generated, and the reactive current disturbance adopts the reactive current (ie figure 1 Iqref) in the reference disturbance, the schematic diagram of the reference disturbance is as follows Image 6 As shown, among them, Vpvref_d is the PV voltage disturbance signal, which is superimposed on the voltage reference value; Iqref_d is the reactive current disturbance signal, which is superimposed on the reactive current reference value; where the wave arrow ...
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