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Single-phase grid connection inverter for solar photovoltaic power generation

A solar photovoltaic and solar cell technology, applied in photovoltaic power generation, single grid parallel feeding arrangement, irreversible DC power input conversion into AC power output and other directions, can solve the problem of solar energy utilization rate less than 1/1000, etc. To achieve the effect of improving work performance and safety, and improving work efficiency

Active Publication Date: 2014-09-10
NANJING OULU ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country is also very rich in solar energy resources. Except for some areas on the Guizhou Plateau, most of China is rich in solar energy resources. The current utilization rate of solar energy is less than 1 / 1000.

Method used

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  • Single-phase grid connection inverter for solar photovoltaic power generation
  • Single-phase grid connection inverter for solar photovoltaic power generation
  • Single-phase grid connection inverter for solar photovoltaic power generation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 1 , the solar photovoltaic power generation single-phase grid-connected inverter of the present invention includes an inverter 1, a controller 2 and a monitoring and protection module 3:

[0030] The inverter 1 includes a DC / DC conversion unit 11 and a DC / AC conversion unit 12. The direct current output by the solar cell 10 is upgraded to the direct current required by the inverter for grid-connection through the DC / DC conversion unit 11, and then passed through the DC / DC conversion unit 11. The AC conversion unit 12 converts the AC power required by the grid 20; the inverter 1 also includes an input protection switch 13 and an output protection switch 14, and the input protection switch 13 is connected to the solar cell 10 and the DC / DC conversion unit 11 to Control whether to input the direct current output by the solar cell 10 to the DC / DC conversion unit; the output protection switch 14 connects the DC / AC conversion unit 12 and the grid 20 to control...

Embodiment 2

[0048] refer to Figure 4 , same as Embodiment 1, the solar photovoltaic power generation single-phase grid-connected inverter of this embodiment includes an inverter 1, a controller 2 and a monitoring and protection module 3:

[0049] The inverter 1 includes a DC / DC conversion unit 11 and a DC / AC conversion unit 12. The direct current output by the solar cell 10 is upgraded to the direct current required by the inverter for grid-connection through the DC / DC conversion unit 11, and then passed through the DC / DC conversion unit 11. The AC conversion unit 12 converts the AC power required by the grid 20; the inverter 1 also includes an input protection switch 13 and an output protection switch 14, and the input protection switch 13 is connected to the solar cell 10 and the DC / DC conversion unit 11, To control whether the direct current output by the solar cell 10 is input to the DC / DC conversion unit; the output protection switch 14 is connected to the DC / AC conversion unit 12 a...

Embodiment 3

[0055] refer to Figure 5 , same as Embodiment 1, the solar photovoltaic power generation single-phase grid-connected inverter of this embodiment includes an inverter 1, a controller 2 and a monitoring and protection module 3:

[0056] The inverter 1 includes a DC / DC conversion unit 11 and a DC / AC conversion unit 12. The direct current output by the solar cell 10 is upgraded to the direct current required by the inverter for grid-connection through the DC / DC conversion unit 11, and then passed through the DC / DC conversion unit 11. The AC conversion unit 12 converts the AC power required by the grid 20; the inverter 1 also includes an input protection switch 13 and an output protection switch 14, and the input protection switch 13 is connected to the solar cell 10 and the DC / DC conversion unit 11, To control whether the direct current output by the solar cell 10 is input to the DC / DC conversion unit; the output protection switch 14 is connected to the DC / AC conversion unit 12 a...

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Abstract

The invention discloses a solar photovoltaic power generation single-phase grid-connected inverter, which includes an inverter, a controller and a monitoring and protection module: the inverter includes a DC / DC conversion unit, a DC / AC conversion unit, an input protection switch and an output Protection switch; monitoring and protection module includes battery voltage / current detection unit and grid voltage / phase detection unit; controller includes MTTP signal generation unit, SPWM signal generation unit, protection control unit, MTTP signal generation unit according to battery voltage / current detection unit The detection result sends the MTTP signal to the DC / DC conversion unit; the SPWM signal generation unit sends the SPWM signal to the DC / AC conversion unit according to the detection result of the grid voltage / phase detection unit; when it is judged that the solar cell and / or the grid are abnormal, the protection control The unit sends a control signal to the input protection switch and / or the output protection switch to disconnect the connection between the solar cell and the inverter and / or between the inverter and the grid.

Description

Technical field [0001] The present invention involves the field of photovoltaic power generation, especially for a solar photovoltaic power generation and network inverter. Background technique [0002] With the continuous development of industrial civilization, we have more and more demand for energy.Traditional fossil energy can no longer meet the requirements. In order to avoid the dilemma of energy depletion, finding high -quality alternative energy has become a hot issue for people's attention.Renewable energy, such as water energy, wind energy, solar energy, tidal energy, and biomass energy, and other energy forms are constantly referred to as people's eyes.As the earliest application of renewable energy power generation, water conservancy power generation has been widely used, but some people have questioned their environmental problems and safety issues. Moreover, the current level of water energy development is high, and there are some difficulties in continuing developm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02M7/48H02M3/10H02H3/00
CPCY02E10/563Y02E10/56
Inventor 江华
Owner NANJING OULU ELECTRIC CORP LTD