Photovoltaic I-V curve test system and method, and photovoltaic equipment

A test system and test method technology, applied in the field of photovoltaics, can solve problems such as inability to detect I-V curves, inability to quickly locate photovoltaic strings, inability to accurately monitor the operating status of photovoltaic systems, etc.

Pending Publication Date: 2021-11-12
SINENG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a photovoltaic I-V curve testing system and testing method, aiming to solve the problem that the existing I-V curve cannot be detected in the full voltage range, so that the operating status of the photovoltaic system cannot be accurately monitored, and the faulty photovoltaic group cannot be quickly located. string problem

Method used

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  • Photovoltaic I-V curve test system and method, and photovoltaic equipment
  • Photovoltaic I-V curve test system and method, and photovoltaic equipment
  • Photovoltaic I-V curve test system and method, and photovoltaic equipment

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Embodiment 1

[0028] Such as figure 1 As shown, this embodiment provides a photovoltaic I-V curve test system, the photovoltaic I-V curve test system includes: a photovoltaic module, composed of a plurality of photovoltaic strings; Convergence; inverter components, connected to the combiner box; inverter components include inverters, bus capacitors connected to the inverters; detection units, located in the combiner box, connected to each photovoltaic string, used to detect each photovoltaic The current and voltage of the string; the control unit, which is connected with the combiner box, the inverter and the detection unit, and the control unit is used to control the inverter to be in the off-grid state during the test, so that multiple photovoltaic strings can be used as inverters Bus capacitor charging, obtain the current and voltage data of each photovoltaic string when multiple photovoltaic strings charge the bus capacitor, and obtain the photovoltaic I-V curve in the full voltage rang...

Embodiment 2

[0055] This embodiment provides a photovoltaic I-V curve test method, the photovoltaic I-V curve test method includes the following steps:

[0056] Control the inverter to be in the off-grid state, and charge the inverter bus capacitor;

[0057] Obtain the current and voltage data of each photovoltaic string when multiple photovoltaic strings charge the inverter bus capacitor;

[0058] And according to the current and voltage data of each photovoltaic string, the photovoltaic I-V curve in the full voltage range is obtained.

[0059] In this embodiment, the photovoltaic strings are provided with current and voltage detection devices for measuring the voltage and current of each photovoltaic string.

[0060] In the process of photovoltaic power generation, the inverter is in the grid-connected state when the voltage of the photovoltaic modules reaches the minimum start-up voltage of the inverter. Therefore, in the grid-connected state, the full voltage of the photovoltaic modul...

Embodiment 3

[0076] This embodiment also provides a photovoltaic device, which includes the above-mentioned testing system and a processor, and the processor can run the steps of the above-mentioned photovoltaic I-V curve testing method. The photovoltaic I-V curve test method is as above, and will not be repeated in this embodiment.

[0077]The photovoltaic equipment of this embodiment, when testing the photovoltaic I-V curve, controls the inverter to be in the off-grid state, and charges the bus capacitor; obtains the current and voltage of each photovoltaic string when multiple photovoltaic strings charge the bus capacitor Data; and according to the current and voltage data of each photovoltaic string, the photovoltaic I-V curve in the full voltage range can be obtained. According to the photovoltaic I-V curve, it can be accurately judged whether there is a fault or current mismatch in the photovoltaic module. Compared with the existing photovoltaic equipment, the photovoltaic equipment ...

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Abstract

The invention is applicable to the field of photovoltaic technology, and provides a photovoltaic I-V curve test system and method, and photovoltaic equipment. The photovoltaic I-V curve test system comprises a photovoltaic module, a combiner box, an inverter module, a detection unit and a control unit, and the inverter module comprises an inverter, a bus capacitor, a detection unit and a control unit; and the control unit is used for controlling the inverter to be in an off-grid state during testing, so that the plurality of photovoltaic group strings charge the bus capacitor, current and voltage data of each photovoltaic group string are obtained when the plurality of photovoltaic group strings charge the bus capacitor, and a photovoltaic I-V curve in a full voltage range is obtained according to the current and voltage data of each photovoltaic group string. When the inverter is in the off-grid state, the bus capacitor is charged, the current and voltage data of each photovoltaic string when the bus capacitor is charged are obtained, the photovoltaic I-V curve under the full voltage is obtained, the running state of the photovoltaic module can be monitored according to the photovoltaic I-V curve, and the photovoltaic module with the fault can be accurately judged.

Description

technical field [0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a photovoltaic I-V curve test system, a test method and photovoltaic equipment. Background technique [0002] With the continuous development of the photovoltaic industry, the power level of the inverter continues to increase, and the cost of power generation per watt is further reduced. Photovoltaic owners have higher requirements for the power generation and cost of photovoltaic systems. After research, the failure of photovoltaic modules in photovoltaic systems has a greater impact on the power generation of photovoltaic systems. Therefore, how to accurately diagnose the current mismatch fault of photovoltaic modules has become the current Research focus of photovoltaic industry. [0003] Judging the working state of the photovoltaic system through the photovoltaic I-V curve is a method that is widely used at present. The current photovoltaic system must be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/10H02S40/34H02S40/32H02J3/38
CPCH02S50/10H02S40/34H02S40/32H02J3/381H02J3/388H02J2300/24Y02E10/50Y02E10/56
Inventor 宋英杰赵龙张林江王跃林
Owner SINENG ELECTRIC CO LTD
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