Multi-system solar off-grid and grid-connected inverter system

Abstract

The invention discloses a multi-system solar off-grid and grid-connected inverter system. The system comprises a control DSP, a single-phase / three-phase output dial switch and four groups of main power conversion circuits, wherein the four groups of main power conversion circuits are respectively a bidirectional converter power unit, an off-grid inverter power unit, an MPPT power circuit unit anda battery charging and discharging power unit. Through independent circuit design and corresponding control DSP design, three independent inverter circuits A, B and C of the bidirectional converter power unit are identified as three independent single-phase bidirectional converters, and an independent detection and control algorithm is used, so a circuit architecture can automatically adapt to input single-phase and three-phase voltages, moreover, an output mode of the off-grid inverter power unit is determined through a single-phase / three-phase output dial switch, so the output of the systemcan be in a single-phase or three-phase mode, and input and output modes such as single-phase input and single-phase output, single-phase input and three-phase output, three-phase input and single-phase output and three-phase input and three-phase output can be realized.

Description

technical field [0001] The invention relates to the technical field of solar energy systems, in particular to a multi-mode solar off-grid inverter system. Background technique [0002] At present, the solar off-grid system sold on the market mainly has two power supply systems: single-phase input and single-phase output, three-phase input and three-phase output. Phase in and three phase out, but these quantities will be relatively small, but no matter what type of system, after the design or manufacture of the machine is completed, its power supply system will be fixed and cannot be changed; [0003] In this way, machines with the same power need to be divided into several different models, with different prices, different sizes, and different accessories, which is very inconvenient for market sales, factory production, after-sales maintenance, transportation, and inventory. , the present invention proposes a multi-standard solar off-grid inverter system to solve the proble...

AI Technical Summary

Problems solved by technology

[0002] At present, the solar off-grid system sold on the market mainly has two power supply systems: single-phase input and single-phase output, three-phase input and three-phase output. Phase in and three phase out, but these quantities will be relatively small, but no matter what type of system, after the design or manufacture of the machine is completed, its power supply system will be fixed and cannot be changed;

[0003] In this way, machines with the same power need to be divided into several different models, with different prices, different sizes, and different accessories, which is very inconvenient for market sales, factory production, after-sales maintenance, transportation, and inventory. , the present invention proposes a multi-standard solar off-grid inverter system to solve the problems existing in the prior art

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