Low-voltage ride-through method for photovoltaic inverter

A low-voltage ride-through, photovoltaic inverter technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., to improve the stability and reliability of grid connection, and prevent the voltage from being temporarily low.

Inactive Publication Date: 2011-08-31
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0032] It can be known from the background technical information that the current low voltage ride-through capability of photovoltaic inverters needs to be imp

Method used

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Embodiment Construction

[0049] Below in conjunction with accompanying drawing, technical content of the present invention is described:

[0050] Such as figure 2 , 3 As shown, the low-voltage ride-through method of the photovoltaic inverter of the present invention is specifically implemented as follows:

[0051] The low-voltage ride-through method of the photovoltaic inverter of the present invention is characterized in that the grid voltage is collected, the voltage amplitude is judged in the chip, and the voltage amplitude is used as the current amplitude by using different reference voltage amplitudes for different voltage amplitudes Reference value, photovoltaic power generation is connected to the grid through the inverter. Use the amplitude and duration of the drop to measure the voltage drop of the photovoltaic grid-connected system, so as to achieve low voltage ride through.

[0052] The low-voltage ride-through method of the photovoltaic inverter of the present invention is characterize...

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Abstract

The invention discloses a low-voltage ride-through method for a photovoltaic inverter. The method comprises the following steps of: acquiring a power grid bus side voltage by using a voltage sensor, causing the power grid bus side voltage to pass through a conditioning circuit and transmitting the power grid bus side voltage into a digital signal processor; capturing and calculating a standard voltage amplitude value by using the digital signal processor; judging whether the standard voltage amplitude value is less than a set lower low-voltage limit or not; if the standard voltage amplitude is less than the set lower low-voltage limit, disconnecting the inverter from a contactor of a power grid; on the contrary, judging the duration of the standard voltage amplitude at the lower limit, keeping the inverter connected with the power grid if the duration is less than a standard, and on the contrary, disconnecting the inverter from the power grid; judging whether a power grid voltage unit value is less than a set upper voltage limit or not; performing grid-connection normally on the inverter if the power grid voltage unit value is greater than the set upper voltage limit; on the contrary, judging the duration of the power grid voltage unit value at the upper limit, keeping the inverter connected with the power grid if the duration is less than the standard, and on the contrary, disconnecting the inverter from the power grid; adopting the internally set voltage reference amplitude of the digital signal processor; and realizing inversion by taking the voltage reference amplitude as an inverter reference voltage.

Description

technical field [0001] The invention relates to a low-voltage ride-through of a photovoltaic inverter. The invention relates to a method for improving the grid-connected stability of a photovoltaic inverter. The invention relates to a method for improving the grid-connected reliability of a photovoltaic inverter. The power grid system voltage was temporarily low and disconnected. Background technique [0002] Energy is an important material basis for the existence and development of human society. With the rapid development of society, the demand for energy and resources is increasing. As we all know, non-renewable energy will be exhausted in the near future, and some new energy will come into being. pregnancy. Photovoltaic power generation is a recognized new energy technology with high technical content and great development prospects. This is because solar energy is inexhaustible and inexhaustible, does not produce any waste, has no noise and other pollution, and will no...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 袁晓玲李世军张叶范发靖周素梅
Owner HOHAI UNIV
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