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It is required to use the DC current sensor in the photovoltaic system which is controlled by the maximum power point tracking. To eliminate this expensive sensor, this paper shows how to estimate DC output current of PV array by using the main capacitor voltage and on-duration of the main semiconductor switch in high frequency link type inverter. The experimental data show the proposed technique is helpful to practical use.

Current-Sensor-Less Control of High Frequency Link Type Inverter for Photovoltaic System