Direct duty-cycle control for Maximum Power Point Tracking of multi-module converter

In the PV system, Module Integrated Converter (MIC) is widely used for BIPV application because of the high efficiency by controlling each module´s MPPT locally. However, as the number of PV module increases, the material cost of the power conditioning system also increases. In this paper, to reduce the cost of the entire system, single Digital Signal Processor (DSP) in the centralized host power stage is utilized for MPPT operation of the multi-modules. Voltage and current information of each PV module are sent to the DSP, which operates MPPT algorithm with the information. After this process, DSP sends back the updated duty-ratio to each module correctly by wireless communication. To suggest the proposed method, a couple of 50W module integrated converters and Zigbee (Xbee-pro series1) transceiver are utilized.