A quasi-z source inverter photovoltaic grid-connected control method based on input/output linearization
A technology of source inverter and control method, which is applied in the field of photovoltaic grid-connected control of quasi-Z source inverter based on input/output linearization to achieve the effects of reducing influence, reducing influence and smoothing transients
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[0028] The invention proposes a QZSI input / output linearization modeling method and a QZSI grid-connected control strategy, so that when the operating point of the QZSI changes greatly, it can better track the reference input voltage, reduce the influence of the DC side on the AC side, and improve grid-connected current quality.
[0029] The structure and mathematical model of the QZSI system will be introduced first.
[0030] The topology of single-phase QZSI grid-connected system is as follows: figure 1 shown. QZSI consists of a quasi-Z source impedance network and a single-phase two-level inverter. The quasi-Z source impedance network consists of an inductor L 1 and L 2 , capacitance C 1 and C 2 (L 1 =L 2 = L, C 1 =C 2 =C), and the diode D, which is essentially a passive boost network, the input voltage v in Through the quasi-Z source impedance network and under the action of the bridge arm of the inverter bridge, it is modulated into the desired high-frequency p...
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