Quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and method thereof

Abstract

The invention discloses a quasi-Z-source cascaded multi-level photovoltaic grid-connected inverter control system and a method thereof. The control system comprises a field programmable gate array (FPGA) control logical unit, a digital signal processor (SDP) algorithm calculation unit, a touch screen man-machine interface unit, a high-precision analog-digital conversion unit and a driving signal electro-optical conversion unit, wherein the DSP algorithm processing unit is connected with the FPGA control logical unit and the touch screen man-machine interface unit respectively, and the FPGA control logical unit is connected with the high-precision analog-digital conversion unit and the driving signal electro-optical conversion unit respectively. The control system has the advantages that the expansion demand can be satisfied based on dual controllers of a FPGA and a DSP, complicated control algorithm operation also can be achieved, the function division is reasonable and clear, and the system structure is high in universality.

Description

technical field [0001] The invention belongs to the technical field of cascaded multi-level grid-connected photovoltaic inverters, and in particular relates to a quasi-Z source cascaded inverter control system based on FPGA and DSP. Background technique [0002] At present, the scale of global solar power generation continues to expand, and solar power generation technology has received extensive attention and research from many scholars. Cascaded multi-level inverters have good application value in large-scale photovoltaic grid-connected systems. This topology inverter requires multiple independent DC power sources, which exactly match the characteristics of photovoltaic power generation. This kind of inverter can control different photovoltaic power generation modules to output maximum power, and it is easier to achieve high output voltage level. The quasi-Z source cascaded multilevel inverter adds a quasi-Z source network on the basis of the traditional cascaded inverter...

AI Technical Summary

Problems solved by technology

[0003] However, compared with the traditional two-level inverter, the quasi-Z source cascaded multi-level inverter system has a complex structure, the physical distance between the modular quasi-Z source H-bridge units is large, and the amount of voltage and current data that needs to be collected is large. At the same time, more PWM drive signals are required

In terms of chip resources, a single DSP controller can no longer meet the needs of the control system

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