Anti backflow equipment for photovoltaic power plants

1、 Overview

Driven by the global energy transition and the "dual carbon" goal, the installed capacity of distributed photovoltaics continues to rise. However, as the penetration rate of photovoltaics increases, the problem of backflow (photovoltaic power generation being sent back to the grid) is becoming increasingly prominent: it may not only cause frequency fluctuations and voltage exceeding limits in the grid, but also result in users facing fines for violating grid connection regulations. Traditional counter current prevention schemes mostly rely on hard cut-off or single inverter regulation, and there are some pain points such as delayed response, rough regulation and poor economy.

AM5SE-ISAnti backflow equipment for photovoltaic power plantsThe birth of this has provided the industry with a breakthrough path of "safety economy intelligence". With a dual protection mechanism (anti backflow+anti islanding) as its core, it integrates high-precision hardware, flexible adjustment algorithms, and multi scenario adaptation capabilities, making it an ideal choice for industrial and commercial rooftop photovoltaics, large-scale solar storage power stations, microgrids, and other scenarios. This article will deeply analyze how AM5SE-IS reshapes the paradigm of photovoltaic anti backflow technology from four aspects: product characteristics, technological advantages, application scenarios, and user value.

2、 Photovoltaic anti backflow flexible regulation technology solution

2.1 Overview of the Plan

By installing an integrated islanding/reverse flow device at the incoming line of the municipal power supply (for multiple grid connection points, master-slave multi anti reverse flow devices can be used), real-time monitoring of the photovoltaic grid connection situation can be carried out, and the monitoring signal can be uploaded to the coordination controller. By logically calculating the reverse flow data, the output power of the inverter is adjusted to achieve no reverse flow situation.

At the same time, in order to prevent the coordination controller from crashing, sudden load changes, or communication interruptions, if the coordination controller fails to adjust the output of the inverter in a timely manner, the protection action of the anti backflow device can be used to disconnect the grid connected cabinet circuit breaker to achieve the purpose of anti backflow.

2.2 Anti backflow principle and diagram

The ACCU-100, combined with the anti backflow protection device AM5SE-IS scheme, monitors the backflow situation at the common connection point. Once backflow is detected or about to occur, a signal is sent to the coordination controller through the communication interface. The coordination controller monitors the power at the main incoming line and real-time power generation, and generates corresponding inverter adjustment instructions through system calculation to achieve flexible regulation of photovoltaic anti backflow. At the same time, reverse power or low power protection functions are installed in the anti backflow protection device as a flexible control for backflow protection in case of loss of control. This method can ensure that the power system operates according to design, protect the safety and stability of the power grid, and also utilize photovoltaic power generation.

As shown in the figure, the dashed box represents the user's power grid, which is connected to the power grid through a common connection point C. Within the user's power grid, there are two distributed photovoltaic power generation systems connected to the user's power grid through points A and B. Points A and B are both grid connection points, but not public connection points. At point D, there is a distributed photovoltaic power generation system directly connected to the public grid. Point D is a grid connection point and also a public connection point. Therefore, the anti backflow of distributed photovoltaics should monitor the grid power at the common connection point (point C or D).

3、 Functional diagram of AM5SE-IS anti backflow protection device

4、 Conclusion

During the critical period of the transformation of distributed photovoltaics from "scale expansion" to "quality development", AM5SE-IS has redefined the standards of photovoltaic anti backflow technology with dual protection mechanisms, high-performance hardware, flexible adjustment algorithms, and multi scenario adaptation capabilities. It is not only a "guardian" to ensure the safety of the power grid, but also an "efficiency enhancer" to enhance the economy of photovoltaics, and a "connector" to build a smart energy ecosystem.

In the future, with the in-depth promotion of the "dual carbon" goal and the rapid development of the energy Internet, AM5SE-IS will continue to iterate and upgrade, integrate AI prediction, blockchain traceability and other cutting-edge technologies, and provide safer, more economical and more intelligent solutions for global energy transformation. Choosing AM5SE-IS means choosing to align with future energy trends.

Anti backflow equipment for photovoltaic power plants