High-Frequency-Link-Based Grid-Tied PV System With Small DC-Link Capacitor and Low-Frequency Ripple-Free Maximum Power Point Tracking

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this paper. a grid-tied CMI PV system based on CF-DABdc-dc converters using small dc-link capacitors has been proposed.“d = 1“ control was applied to minimize the peak currentstress in the converter by synchronizing the LVS dc-link voltagewith HVS dc-link voltage. A detailed low-frequency power mitigationcontrol for the CF-DAB converter was proposed basedon the dynamic model of the converter. With the proposed dualloopcontrol using PIR controller. the large low-frequency voltageripple on the dc-link can be blocked away from the PVside. This proposed power mitigation control can be extendedto other current-fed topologies. e.g.. CF-DHB and CF-DAB3.An autonomous variable step-size INC MPPT method was alsoproposed. Fast tracking speed under rapid irradiation changeand high MPPT efficiency (&gt.99.5%) were realized for the PVsystem. Experimental results of the 5-kW PV converter modulewere given to verify the power mitigation control and MPPTmethod.