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Case Sharing, Component-level Monitoring Data Analysis of Guodian Jiande PV Power Station

    In the operation and maintenance of PV power plants, low power generation efficiency and large power loss have always been a headache for operation and maintenance personnel. Low power generation efficiency may be caused by various factors, such as component abnormality, component occlusion, component accumulation, and MPPT failure. Conventional operation and maintenance cannot effectively solve such problems. Located in the 20MWp agricultural and photovoltaic complementary PV power station of State Power Investment Corporation in Jiande City, Zhejiang Province, the reason for the low photovoltaic power generation has been preliminarily analyzed by using Fonrich's module IoT and safety protection scheme for 2 months. The following is a detailed data demonstration.

    

1.Power generation analysis

Total power generation: 1762.27kWh

Total lost power generation: 174.54kWh

Percentage of total power lost: 9.9%

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Date
Power Generation (kWh) Total Loss (kWh) Loss Percentage
2021/11/24 80.5162 5.6159 6.97
2021/11/25 114.3602 9.7766 8.55
2021/11/26 117.7779 9.7854 8.31
2021/11/27 79.7865 7.7391 9.70
2021/11/28 46.0023 3.3145 7.21
2021/11/29 26.5772 2.7861 10.48
2021/11/30 83.9544 8.2659 9.85
2021/12/1 120.5157 14.3987 11.95
2021/12/2 115.2152 13.5085 11.72
2021/12/3 117.3081 13.9122 11.86
2021/12/4 110.7681 12.0415 10.87
2021/12/5 110.6371 12.8249 11.59
2021/12/6 112.7549 11.3614 10.08
2021/12/7 97.4537 8.0278 8.24
2021/12/8 75.9412 7.635 10.05
2021/12/9 71.5402 6.6965 9.36
2021/12/10 92.9073 8.5614 9.21
2021/12/11 71.634 4.6404 6.48
2021/12/12 2.9986 1.4 46.69
2021/12/13 27.785 3.4648 12.47
2021/12/14 11.2647 3.1612 28.06
2021/12/15 74.571 5.6185 7.53
Total 1762.2695 174.5363 9.9


The average daily power generation loss is about 10%, which is significantly higher than the loss ratio of ordinary photovoltaic power stations


2.Loss Type Analysis

图片4


Loss Type Lost Electricity Generation (kWh) Lost Percentage
Component exception 13.22 0.75
Component Shadow 130.52 7.41
Inverter MPPT 29.92 1.70
Component dust accumulation 0.88 0.04
Total 174.54 9.90

    Through data analysis, it is found that the power station has a small proportion of losses due to dust accumulation, but a large proportion of component shadows and inverter MPPT failures. It can be concluded that the operation and maintenance personnel of this power station are very attentive and clean the power station in a timely manner, but the problems of component shadowing and inverter MPPT failure cannot be solved through routine operation and maintenance.



3.Component abnormal loss analysis

    Abnormal components will cause series loss in the string. If the inverter MPPT is input by multiple channels in parallel, it will lead to mismatch loss between strings and parallels. The following figure shows the thermal diagram of abnormal loss of components. The darker the color of the module, the more serious the abnormal loss. If the abnormal loss ratio of the module exceeds 10%, it is recommended to replace the module to improve the overall power generation.

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Component abnormal loss heat map

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4.Component Shadow Loss Analysis

    Shaded components will cause series loss in the string. If the inverter MPPT is input by multiple channels in parallel, it will lead to mismatch loss between strings and parallels. The darker the color of the module, the more serious the abnormal loss, and the shadow loss ratio of the module exceeds 10%. It is recommended to solve the shadow problem and improve the overall power generation.

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Component Shadow Loss Heatmap

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5.Inverter MTTP Loss Analysis

    MPPT loss caused by parallel mismatch between strings; inverter power reduction operation will cause MPPT loss; inverter aging and sampling distortion will cause MPPT loss; inverter MPPT loss will affect the overall power generation of the power station! When the inverter MPPT loss percentage is greater than 4%, it is recommended to replace the inverter.

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String Lost power generation (kWh) Loss percentage
1 7.21 0.41
2 5.91 0.34
3 6.42 0.36
4 4.37 0.25
5 6.01 0.34
Total 29.92 1.70

Inverter MPPT loss ratio



6.Component Ash Loss Analysis

The fouling of the module will affect the overall power generation. It is recommended that the module should be cleaned when the fouling loss ratio of the module is greater than 4%.

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Component fouling loss heat map

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7.The benefits of component IoT and security protection


Component-level data reports, quickly locate faulty components, increase power generation, and improve operation and maintenance efficiency

Fengzhi Safety Photovoltaic-Data Report, which analyzes in detail the power loss of abnormal components, shadow components, fouling components and inverter MPPT, and locates the position of components, which greatly improves the efficiency of operation and maintenance. After targeted adjustment After that, the power generation capacity of the power station can be increased.

The low-voltage components are automatically turned off to protect the components and increase the power generation of the string

When there is an abnormality or shadow in the module, the voltage of the module drops, and the end module will actively shut down the output of the module, eliminating the impact of the abnormality and shadow on the string, protecting the module and improving the power generation of the string.

A variety of shutdown methods to escort the safety of the power station

Manual shutdown:

1. During rescue, the main control is manually turned off, and the component voltage drops to 0V within 30S

2. Through the main control fixed-point shutdown of the problem components, quickly solve the failure of power generation

Automatic shutdown:

1. The head end is powered down

2. String disconnection

3. Overtemperature at the end

4. Arc accident

5. Electric leakage accident

Various fault detection to solve the pain points of power station operation and maintenance

Arc Detection:

1. Parallel arc

2. Series arc

3. Arc positioning

Leakage detection:

Leakage fault location


8.System Components

system structure

1642734634(1)

System solutions

Name Quantity Function
①Tail module 22*5=110 Shutdown, monitoring, arc protection, leakage protection
②Head module 1 PLC transceiver, 485 communication
③Collection box 1 Local display, shutdown protection, data upload
④Cloud server
Analyze, manage plant data
⑤Fonrich PV Management System
Display and manage power station data




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