SoCbased Controller of B4 Inverters for a LowCost PV System in Gridconnected Mode

SoCbased control unit for B4 inverters in a cheap gridconnected Photovoltaic (PV) system is proposed in this paper. Because the inverter is the main element of Photovoltaic module, we utilized the B4 one here for decrement of entire expenditure of Photovoltaic system. This paper also coupled the Photovoltaic system to the main grid via IGBT switches for removing the bulky transformers. Besides, in order to inject the real energy to the main grid, this kind inverter is able to compensate to make up the real power and mitigate the harmonics related to the nonlinear loads. Instead of the conventional PV systems on which a DSP processor is used to control the B4 inverter, we applied a zynq7020 SoCbase control unit for effective control of the B4 inverter. Several characteristics of such control units such as dedicated low power and fast 32bit×32bit multipliers, with modified algorithm, enable the application of the required control methods. The operation of the proposed control unit in a PV system is implemented on zynq7020. Implementation of the control unit in the SoC zync7020 is the main contribution of this paper. Comparison with the conventional DSPbased control systems, TMS320F28335 DSP processor, demonstrated the high efficiency of the proposed SoCbased control unit for B4 inverters.