Dyness Knowledge | Application of anti-reflux in photovoltaic industry (Part 2)

Introduction

In the previous article, we described the concept and basic principles of anti-reflux. This section will tell you how to conduct simulation tests on photovoltaic anti-refulx solutions and anti-reflux protection devices, and popularize the differences between anti-reflux devices and anti-islanding devices.

Photovoltaic anti-reflux solution

In order to prevent photovoltaic backflow, measures such as installing anti-refulx protection devices, reasonable configuration of photovoltaic systems and loads, and regular inspection and maintenance are generally adopted.

• Install an anti-reflux protection device: The anti-reflux controller monitors the current flow direction and transmission power at the grid end in real time. When it is found that there is current flowing to the grid, it communicates with the photovoltaic inverter through RS485/Ethernet and other interfaces, and reduces the output power of the corresponding inverter until it no longer feeds power to the grid, achieving the purpose of preventing reverse flow.
• Properly configure the photovoltaic system and load: When designing and installing the photovoltaic system, the size of the photovoltaic system and load should be reasonably configured according to the actual situation to avoid the occurrence of reverse current caused by excessive power generation of the photovoltaic system.
• Regular inspection and maintenance: Regular inspection and maintenance of the photovoltaic system and anti-reflux protection device to ensure their normal operation and effectiveness.

How to simulate testing of anti-reflux protection device

• Preparation: Prepare test tools, including anti-reflux protection device, power supply, load, multimeter, etc. Connect the test circuit and connect the anti-reflux protection device between the power supply and the load to form a complete circuit. Set test parameters, and set corresponding parameters, such as current, voltage, power, etc., according to the specifications and requirements of the anti-reflux protection device.
• Start-up test: Turn on the power, gradually increase the load, and observe the reaction and action of the anti-reflux protection device.
• Test results: Record the reaction and action of the anti-reflux protection device under different loads, as well as the corresponding current, voltage, power and other parameters. Analyze the performance and reliability of the anti-reflux protection device and whether it meets the specifications and requirements.

Note: Since the simulation test needs to be carried out based on the actual situation of the anti-reflux protection device, the specific test methods and steps may be different. At the same time, simulation testing also needs to be conducted by professionals to ensure the accuracy and reliability of test results.

The difference between anti-reflux device and anti-islanding device

so what is the difference between the anti-reflux device and the anti-islanding device?

Although they both play a role in protecting the stable operation of the power system, their functions and roles are different.

The anti-reflux device is mainly used to prevent backflow in the power system and avoid adverse consequences caused by backflow problems in the power system. The anti-islanding device is to detect whether there is an islanding phenomenon in the power system, so as to take action to ensure the normal operation of the power system. The core difference between the two is that the anti-reflux device is mainly for prevention, while the anti-islanding device is mainly for detection.

In addition, the application scope of anti-reflux devices and anti-islanding devices is also different. anti-reflux devices are mainly used in power supply facilities such as inverters and solar panels, while anti-islanding devices are generally used in independent power systems, microgrids and distributed power systems.

Generally speaking, anti-reflux devices and anti-islanding devices both play a vital role in power system protection, but their functions and roles are different, and their application scope is also different. It is crucial for the safe and stable operation of the power system, so the power industry should choose appropriate devices for installation and use according to specific conditions.

Conclusion

Compared with other energy sources, photovoltaic resources have unlimited resource advantages. anti-reflux is an important part of the development of the photovoltaic industry in meeting user needs, in order to cope with more new needs and usage scenarios. anti-reflux measures for grid-connected photovoltaic systems will face more challenges and higher requirements. I hope this article will be helpful for everyone to understand the concept of anti-reflux.

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