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Photovoltaic grid connection power generation system based on DC converter and working method thereof

A DC converter and grid-connected power generation technology, which is applied in photovoltaic power generation, light radiation generators, control/regulation systems, etc., can solve problems such as limiting the promotion of photovoltaic grid-connected systems and rising photovoltaic system costs, and achieve excellent tracking accuracy and Stability, reducing the impact of single branch faults, and stabilizing the DC bus voltage

Inactive Publication Date: 2009-08-05
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Since the grid-connected inverter must have an isolation transformer to electrically isolate the photovoltaic grid-connected system from the grid, the cost of the photovoltaic system will increase, which limits the promotion of the photovoltaic grid-connected system

Method used

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  • Photovoltaic grid connection power generation system based on DC converter and working method thereof
  • Photovoltaic grid connection power generation system based on DC converter and working method thereof
  • Photovoltaic grid connection power generation system based on DC converter and working method thereof

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Embodiment

[0030] Embodiment: A kind of photovoltaic grid-connected power generation system based on novel DC converter (see attached figure 1 ), which is characterized in that it is composed of a DC converter, a grid-connected inverter, an isolation transformer and a control circuit; the input terminals of the said DC converter are respectively connected to the two ends of the solar cell array, and the output terminals are connected to the grid-connected The input end of the inverter; the output end of the grid-connected inverter is connected to the input end of the isolation transformer, and the output end of the isolation transformer is connected to the power grid; the control circuit with the digital signal processor as the control core The input end is connected to the signal output ends of the DC converter and the inverter, and the output end is connected to the signal input ends of the DC converter and the grid-connected inverter.

[0031] The DC converter mentioned above (see att...

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Abstract

The invention provides a grid-connected photovoltaic power generating system based on a novel direct current converter and a working method of the grid-connected photovoltaic power generating system. The grid-connected photovoltaic power generating system is characterized in that the grid-connected photovoltaic generating power system consists of a direct current converter, a grid-connected inverter, an isolation transformer and a control circuit; the working method comprises the steps as follows: 1. collecting signal; 2. MPPT module data processing; 3 applying an MPPT arithmetic; 4 inverter module data processing; 5. applying a grid-connected arithmetic; and 6. applying SPWM arithmetic. The grid-connected photovoltaic power generating system and the working method thereof have the advantages of small technical realization difficulty, obviously reducing the cost, flexible installation, convenient maintenance, high voltage and current detection precision, advanced control arithmetic, quick running speed of control chip, the system being capable of obtaining excellent tracking precision and stability, combining the hardware device with the software programming of a digital signal processor, simple design, low cost and easy realization of the hardware device, brief and understandable software programming arithmetic.

Description

(1) Technical field: [0001] The invention belongs to a solar photovoltaic grid-connected power generation system, in particular to a photovoltaic grid-connected power generation system based on a DC converter and a working method thereof. (two) background technology: [0002] As an important renewable energy source, solar energy is abundant and clean, and it is an important part of the energy strategy for sustainable development of human beings. It has developed rapidly in recent years. The three development trends of solar energy utilization are: the transformation of solar energy from supplementary energy to alternative energy, the development of solar power generation from areas without electricity to areas with electricity, and the development of solar photovoltaic systems from off-grid independent photovoltaic systems to photovoltaic grid-connected systems. [0003] However, there are still many factors restricting the promotion of household photovoltaic grid-connected ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02N6/00G05F1/67
CPCY02E10/58Y02E10/563Y02E10/56
Inventor 周雪松郭润睿马幼捷田密陈德树王辉
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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