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Household photovoltaic system DC side fault diagnosis method

A household photovoltaic and fault diagnosis technology, applied in the field of power grid operation and maintenance, can solve problems such as difficult data collection, ignoring applicable scenarios, and excessive data dimension requirements, and achieve the effect of reducing losses

Pending Publication Date: 2021-01-29
STATE GRID ZHEJIANG ANJI POWER SUPPLY +2
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Problems solved by technology

Faults on the DC side include permanent short-circuit and open-circuit faults such as component delamination, internal air bubbles, unit yellowing, scratches, and hot spots, as well as temporary faults caused by factors such as partial shadow coverage and dust pollution, and also occur when the components are in normal use. Abnormal aging faults occur during the service life, and all of the above faults may lead to a decline in the output power, efficiency and reliability of photovoltaic systems for household use
[0007] At present, there are few fault diagnosis algorithms for household photovoltaic systems, because the output of photovoltaic systems is affected by multiple factors, and meteorological factors (light intensity, temperature) lack professional instruments for each photovoltaic user. Data collection is difficult
Most of the existing algorithms are based on experimental conditions, and the requirements for the dimensionality of the data are too high, and the accuracy is blindly pursued, ignoring the applicable scenarios

Method used

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  • Household photovoltaic system DC side fault diagnosis method
  • Household photovoltaic system DC side fault diagnosis method
  • Household photovoltaic system DC side fault diagnosis method

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Embodiment Construction

[0057] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0058] like figure 2 Shown, the present invention comprises the following steps:

[0059] Step 1. Acquisition of original information, including the data kept by household photovoltaic users, generally including the reported installed capacity, the geographical location of the user, the manufacturer and model of photovoltaic modules and inverters, and the photovoltaic load and power generation recorded by the smart meter. There is also the user information of the failure;

[0060] Step 2. Find the three normal users whose geographic location is closest to the faulty user, and solve the equations to obtain the approximate photogenerated current value I of the normal user components at any time h , the equations are shown in formula (1):

[0061]

[0062] In the formula:

[0063] C 2 =(U m / U OC -1)[ln(1-I m / I SC )] -1...

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Abstract

The invention discloses a household photovoltaic system DC side fault diagnosis method, and relates to the field of power grid operation and maintenance. Household photovoltaic system DC side fault diagnosis is mostly based on experimental conditions, a requirement for the dimension of data is too high, the accuracy is pursued blindly, and application scenes are ignored. The method comprises the following steps: finding out three normal users closest to a fault user, solving a photo-generated current value according to a single-diode model formula of a photovoltaic module, calculating a powerloss time sequence of the fault user in a single day, fitting the power loss by using a least square method, combining output characteristics of a photovoltaic array, and obtaining a fault diagnosis result according to a fitting result. According to the technical scheme, the analysis and fault diagnosis of a household photovoltaic state in one region are completed only by depending on the readingand installation information of an intelligent electric meter installed by the user, and the loss caused by a fact that a photovoltaic fault cannot be perceived by the user is effectively reduced.

Description

technical field [0001] The invention relates to the field of grid operation and maintenance, in particular to a method for diagnosing faults on the DC side of a household photovoltaic system. Background technique [0002] With the country's vigorous promotion of renewable clean new energy and the emphasis on natural ecology, photovoltaic power generation has been widely promoted and applied due to its pollution-free and sustainable characteristics. Around 2013, with the increase of policy subsidies for photovoltaic power generation, large-scale photovoltaic power generation was gradually connected to the grid, distributed photovoltaic users increased sharply, and photovoltaic installed capacity has leapt to the first place in the world. After photovoltaics are widely spread across the country and gradually stabilized, due to the particularity of photovoltaic installation locations, how to monitor the operating status of photovoltaics and analyze the failures that occur has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00
CPCH02S50/00Y02E10/50Y02B10/10
Inventor 龚超崔屹章坚民俞宙杰王伟康郭涛焦田利张靓
Owner STATE GRID ZHEJIANG ANJI POWER SUPPLY
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