Automatic data acquisition design of PV inverter system based on FPGA

A multi‐channel data acquisition scheme for the single‐phase photovoltaic(PV ) inverter sys‐tem is designed based on Altera field‐programmable gate array (FPGA ) chip Cyclone V and 16‐bit high‐precision and low‐cost analog‐to‐digital conversion chip AD7656 .It can be used in single‐phase inverters of photovoltaic system w here there are six electrical PV parameters including DC output voltage ,DC output current ,DC output voltage of boost circuit ,AC output voltage of inverter ,AC output current of inverter and grid‐connected AC current .By using very‐high‐speed integrated circuit hardware description language(VHDL) ,a novel serial peripheral interface(SPI) master is designed in FPGA chip to control the AD7656 interface of six‐channel data acquisition .Moreover ,the developed new and interactive JTAG‐CTRL tool and integrated circuit IP soft core can configure the registers of automatic script and also transport these collected data after loading the top net list into FPGA board . The system has implemented the functions of data acquisition ,storing ,control ,automatic test and debug etc .The test results indicate that the designed system has high accuracy with the average error of voltage and current of only 0.92% ,and the on‐line measuring system works reliably .