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Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)

A photovoltaic inverter and condition detection technology, applied in the direction of instruments, electrical devices, measuring devices, etc., can solve the problem of high hardware costs and achieve full utilization

Active Publication Date: 2011-11-23
SHANGHAI CHINT POWER SYST +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In inverters with DC / DC, the disadvantage of this solution is the high cost of hardware

Method used

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  • Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)
  • Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)
  • Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current)

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Embodiment Construction

[0024] refer to image 3 and Figure 4 , a kind of start-up condition detection method that is applicable to the photovoltaic inverter with DC / DC of the present invention, it is characterized in that carry out according to the following steps:

[0025] 1) The DSP control unit samples the PV voltage of the solar panel. When the PV voltage of the solar panel reaches the preset start-up threshold voltage Vmin, it is recorded as the time t1; During this process, it is detected that the voltage of the solar panel PV is continuously greater than the start-up threshold voltage Vmin, then the DSP control unit samples the BUS voltage through the sampling circuit, and records the BUS voltage as V1, and at the same time, the DSP control unit controls the DC / DC circuit to start working;

[0026] 2) The DSP control unit controls the PV voltage of the solar panel to be near the start-up threshold voltage Vmin, and keeps it stable until t3 within a set period of time; when the PV voltage of...

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Abstract

The invention discloses a startup condition detection method suitable for photovoltaic inverter with DC / DC(direct current / direct current). A DC / DC circuit extracts energy from a solar cell panel PV and stores the energy on a BUS capacitor C2; the output power of the solar cell panel PV is calculated according to the change of energy storage of the BUS capacitor in unit time, thereby realizing relatively high voltage sampling precision; and meanwhile, as the no-load power consumption of a specific inverter can be tested in advance, the method of the scheme can relatively accurately judge whether the maximum output power of the solar cell panel is greater than the no-load power consumption of the inverter, and can start up in real time according to the test result and combine grid for generation so as to sufficiently utilize the solar energy output by the solar cell panel without increasing the hardware cost.

Description

technical field [0001] The invention relates to the field of photovoltaic grid-connected inverters or other energy storage conversion equipment whose input sources are solar panels, and specifically relates to a method for detecting start-up conditions applicable to photovoltaic inverters with DC / DC. Background technique [0002] The function of the photovoltaic grid-connected inverter is to convert the DC current generated by the solar panel into AC power with the same frequency and phase as the public grid, and feed it to the grid. [0003] Such as figure 1 Shown is the output characteristic curve of the solar panel under different light intensities. Since the intensity of the sun's light gradually increases from night to day, the maximum power that the solar panel can output has a process of gradually increasing. The open circuit voltage of the solar panel does not change much with the change of light intensity. It is unreasonable to judge when the inverter starts to r...

Claims

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Application Information

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IPC IPC(8): G01R21/00
Inventor 谭钧承徐锡军张彦虎朱军卫
Owner SHANGHAI CHINT POWER SYST
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