Inverter Diagnosis Method and System

A diagnostic method and inverter technology, applied in the monitoring of photovoltaic systems, electrical components, photovoltaic modules, etc., can solve problems such as low power generation efficiency, reduced power generation efficiency of photovoltaic power plants, and inability to detect all inverters, and achieve optimal results. Work efficiency, reduce the false alarm rate of faults, and reduce the effect of power generation loss

Active Publication Date: 2022-05-24
HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the low power generation efficiency caused by the inverter's own hardware running in a semi-fault state, the inverter cannot detect all of them (the hardware fault detection range of the older generation of inverters is less), and the operation and maintenance personnel of the power station cannot handle the inverter relatively comprehensively. Due to various abnormal working conditions of the inverter, the inverter cannot perform its best work efficiency, thereby reducing the power generation efficiency of the photovoltaic power station

Method used

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  • Inverter Diagnosis Method and System

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Experimental program
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Effect test

Embodiment 1

[0049] figure 1 This is a flowchart of an inverter diagnosis method provided in Embodiment 1 of the present invention. This embodiment can be applied to the case of performing fault diagnosis on the inverter of the photovoltaic power station based on the operation data of the photovoltaic power station in operation. The method may be performed by an inverter diagnostic system, for example, by a computing device configured with a processor, and the method specifically includes:

[0050] S110 , acquiring historical operation data of the photovoltaic power station.

[0051] The operation history data of the photovoltaic power station includes the operation data of each inverter in the photovoltaic power station. For example, the active power parameters of each inverter, the power generation current parameters of each inverter string, and the maximum power point voltage data of each inverter, etc.

[0052] S120. Based on the operation history data, determine the number of power ...

Embodiment 2

[0077] figure 2 This is a flowchart of an optimized inverter diagnosis method provided in Embodiment 2 of the present invention. This embodiment is optimized on the basis of the foregoing embodiment. Specifically, the method includes:

[0078] S210 , obtaining historical operation data of the photovoltaic power station.

[0079] S220. Based on the operation history data, determine the number of power extremes of each inverter in the photovoltaic power station on each typical day, and the occurrence time of each power extreme.

[0080] In one embodiment, a typical day is determined by analyzing the variation relationship of the power generation of the photovoltaic string with the largest daily power generation at different sampling times, and the method specifically includes:

[0081] Select the string with the largest daily power generation based on the operation history data;

[0082] Calculate the absolute value of the current second-order difference of the string with th...

Embodiment 3

[0112] image 3 A structural block diagram of an inverter diagnosis system provided by an embodiment of the present invention, the inverter diagnosis system includes: a data acquisition module 310 , a power extreme value determination module 320 , an abnormal fluctuation duration determination module 330 , and an MPPT voltage acquisition module 340 and fluctuation anomaly determination module 350, wherein,

[0113] The data acquisition module 310 is used for acquiring the operation history data of the photovoltaic power station;

[0114] The power extreme value determination module 320 is used for determining the number of power extreme values ​​of each inverter in each typical daily photovoltaic power station and the occurrence time of each power extreme value based on the operation history data;

[0115] The abnormal fluctuation duration determination module 330 is configured to determine the abnormal fluctuation duration of the corresponding inverter based on the number of...

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Abstract

The embodiment of the invention discloses an inverter diagnosis method and system. The diagnosis method includes: obtaining the operation history data of the photovoltaic power station; based on the operation history data, determining the number of power extreme values ​​of each inverter in each typical day in the photovoltaic power station, and the occurrence time of each power extreme value; based on the power extreme value Determine the abnormal fluctuation duration of the corresponding inverter based on the quantity and the occurrence time of each extreme power value; obtain the MPPT voltage of each corresponding inverter; determine whether the corresponding inverter has power based on the MPPT voltage and the abnormal fluctuation duration Abnormal volatility. The embodiment of the present invention determines whether the inverter has abnormal power fluctuation based on the operation history data of the photovoltaic power station. It solves the problem in the prior art that the inverter cannot be detected in time due to its own fault, which leads to the decrease of inverter power generation efficiency. It can detect inverters with potential faults in advance, reduce the false alarm rate of inverter faults, and reduce the cost of photovoltaic power plants. power generation loss.

Description

technical field [0001] Embodiments of the present invention relate to photovoltaic power generation technologies, and in particular, to a method and system for diagnosing an inverter. Background technique [0002] The power generation efficiency is low due to the inverter's own hardware running in a semi-fault state, and the inverter cannot be fully detected (the hardware fault detection range of the old-generation inverter is less), and the power station operation and maintenance personnel cannot relatively comprehensively handle the inverter. Due to various abnormal working conditions of the inverter, the inverter cannot play the best working efficiency, which in turn reduces the power generation efficiency of the photovoltaic power station. SUMMARY OF THE INVENTION [0003] Embodiments of the present invention provide an inverter diagnosis method and system, so as to diagnose inverters with abnormal power, discover potential faulty inverters in advance, and improve the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02S50/00
CPCH02S50/00Y02E10/50
Inventor 张家前
Owner HEFEI SUNGROW RENEWABLE ENERGY SCI & TECH CO LTD
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