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The Most Efficient and Adaptable Inverter and Solution Design for Bifacial Modules

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Generally, a physical model needs to be set up for evaluating the energy yield of bifacial modules. Research personnel from National Renewable Energy Laboratory (NREL), Sandia National Laboratories, and Fraunhofer Institute for Solar Energy Systems (ISE) in Germany have conducted a lot of research. They focus on the ray-tracing and view-factor models which can accurately describe the gain of the bifacial module from the rear. The two models are based on 3D modeling. Although more details can be displayed, algorithms are complex and computing is time-consuming, which does not meet the actual requirements of engineering applications. Huawei has simplified and optimized the two models, and launched an industry-leading intelligent design tool for bifacial module systems based on the 2D physical model (as shown in Figure 2-4). The tool can find the balance point between the calculation speed and design details, and accurately and quickly calculate the optimal configuration of the bifacial module system.
 
Figure 1-1 2D model of a bifacial module whose rear receives radiation
 
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The intelligent design tool for bifacial module systems integrates full-scenario, adaptive, and self-learning intelligent control algorithms to accurately output the optimal design solution. This increases the energy yield by more than 3% compared with solutions provided by other standard design methods. Currently, this tool is the only accurate design tool for bifacial module plants in the industry and has been verified by a large amount of data.
 
In addition, the complexity of the I-V curve of the bifacial module makes the intelligent diagnosis of string faults easy to misjudge, which causes inconvenience to operation and maintenance (O&M). Huawei's latest Smart I-V Curve Diagnosis function 2.0 uses a new intelligent string diagnosis algorithm. Based on big data analysis and AI algorithms, it can automatically learn and evolve. Based on the built-in database, it can quickly master the input and output feature curves of various PV modules and automatically filter out the noise that causes misjudgment. It supports bifacial modules and is the best choice for O&M of bifacial module plants.
 
To sum this up, we compared the Smart PV Solution with the current mainstream inverter solutions, as described in the following table.
 
Table 1-1 Comparison of solutions for bifacial module scenarios
 
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2 Application Cases of Bifacial Modules and Optimal Inverters
Huawei inverters have the following features:
Higher input current and highest efficiency 
Finer MPPT Granularity
Highly adaptive, the most accurate and efficient MPPT 
Secure and reliable protection design
Unique, accurate and the most refined design tool for bifacial module plants in the industry
These five smart tools make Huawei inverters the best match for bifacial modules.
 
In fact, the solutions composed of Huawei inverters and bifacial modules have been widely applied to bifacial module plants in various scenarios. The following table lists some cases.
 
Table 2-1 Cases of Huawei string inverters used in bifacial module plants
 
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Case 1: Gonghe Bifacial module plant
 
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COD: June 2016
Capacity: 1 MW of fixed mounts and 1.3 MW of horizontal single axis trackers
Inverter: Huawei SUN2000-50KTL-C1
PV module: 360 W HIT bifacial module
Application scenario: grassland and sand
Energy yield gain (compared with standard PV modules): 10.5%
 
Case 2: Golmud bifacial module plant
 
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COD: gradually connected to the grid since August 2017 
Capacity: 60 MW of horizontal single axis trackers
Inverter: Huawei SUN2000-50KTL-C1
PV module: 345 W and 350 W PV modules
Application scenario: desert 
Energy yield gain (compared with standard PV modules): 13%
 
Case 3: Xintai solar-agricultural project
 
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COD: November 2017
Capacity: 100 MW of single axis trackers
Inverter: Huawei SUN2000-50KTL-C1
PV module: 310 W PV module
Application scenario: solar-agricultural scenario
Energy yield gain (compared with standard PV modules): 22%
 
Case 4: Lianghuai floating PV plant
 
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COD: December 2017
Capacity: 10 MW
Inverter: Huawei SUN2000-50KTL-C1
PV module: 285 W PV module
Application scenario: white floats on the water surface
Energy yield gain (compared with standard PV modules): 15%
 
Summary
The bifacial module has started a new round of technology replacement. The application of new technologies requires the development of other new technologies, such as the higher inverter input current, finer MPPT granularity, more accurate MPPT algorithms, and smarter design tools for bifacial module plants. Based on the preceding analysis, we are proud to be the provider of the most adaptive PV inverter and solution design in the industry.
 
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