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Earth impedance detecting circuit and method of photovoltaic inverter

A photovoltaic inverter and ground impedance technology, which is applied in the direction of ground resistance measurement, etc., can solve the problems of high cost, complex structure, and low reliability, and achieve the effects of low cost, accurate detection, and precise reliability

Inactive Publication Date: 2013-04-24
SHENZHEN JINGFUYUAN TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The invention proposes a ground impedance detection circuit of a photovoltaic inverter to solve the technical problems of complex structure, high implementation cost and low reliability when the current photovoltaic inverter realizes ground impedance detection

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  • Earth impedance detecting circuit and method of photovoltaic inverter
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  • Earth impedance detecting circuit and method of photovoltaic inverter

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Embodiment Construction

[0030] like figure 1 As shown, the ground impedance detection circuit proposed by the present invention includes an impedance detection module and a microprocessor, wherein the impedance detection module can detect the positive pole-to-ground impedance R+ between the positive pole PV+ of the photovoltaic panel and the earth PE or the photovoltaic cell Negative electrode-to-ground impedance R- between the negative electrode PV- of the board and the earth PE, and the detection terminal PV.ISO of the impedance detection module is connected to the microprocessor. A set of detection voltage U output by the microprocessor sampling detection terminal PV.ISO PV.ISO , and according to a set of measured voltage U PV.ISO Calculate the positive-to-ground impedance Ry or negative-to-ground impedance Rx of the electrodes to be tested (positive PV+ or negative PV-) of each photovoltaic panel, and compare the positive-to-ground impedance Ry or negative-to-ground impedance Rx with the thresho...

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Abstract

The invention discloses earth impedance detecting circuit and method of a photovoltaic inverter. The earth impedance detecting method of the photovoltaic inverter comprises the following steps: respectively inserting a ground connecting resistor between positive electrode of every path of a solar cell panel and the ground, inserting a resistor R 4 and a resistor R 5 in series connection between public negative electrode of every path of the solar cell panel and the ground; obtaining detection voltage of public end of the resistor R 4 and the resistor R 5; calculating positive electrode ground impedance or negative ground impedance of the solar cell pane according to detection voltage and equivalent circuit of the solar cell panel inserting photovoltaic inverter; comparing the positive electrode ground impedance or the negative ground impedance with preset threshold, sending out alarm information when the positive electrode ground impedance or negative ground impedance is smaller than the preset threshold. The earth impedance detecting circuit and method of the photovoltaic inverter have the advantages of being simple in structure, low in achievement cost, reliable, accurate in detection and the like.

Description

technical field [0001] The invention relates to an inverter circuit, in particular to a ground impedance detection circuit and method of a photovoltaic inverter. Background technique [0002] At present, the large-scale application of solar energy will be an important symbol of the progress of human society in the 21st century, and photovoltaic grid-connected power generation system is the development trend of photovoltaic system. [0003] A photovoltaic inverter is a device that converts the DC voltage output by photovoltaic (PV) battery components into AC voltage or current and outputs it to the grid. For different applications, there are one or more input channels for photovoltaic panels. According to the different materials of photovoltaic panels, there are two situations in which photovoltaic panels are tapped to the earth (PE) and ungrounded in practical applications. At present, the ungrounded situation is the mainstream in the market. For ungrounded photovoltaic pa...

Claims

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Application Information

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IPC IPC(8): G01R27/20
Inventor 朱勇平陈恒留
Owner SHENZHEN JINGFUYUAN TECH
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