Design and Application of Anti backflow Control for Optical Storage System in a Data Center

Li Mingjun

Ankerui Electric Co., Ltd. Shanghai Jiading202505

Abstract:With the widespread application of photovoltaic power generation, preventing backflow has become the key to ensuring the safety of the power grid and user benefits. This article provides an in-depth analysis of the core value of photovoltaic anti backflow technology. Through intelligent monitoring and real-time control, it effectively avoids the reverse transmission of electricity from photovoltaic systems to the grid, eliminates safety hazards, and helps users maximize their self use ratio and reduce electricity costs. The article combines project cases to demonstrate how anti backflow solutions can adapt to various scenarios such as household use, industry and commerce, optimize energy management compatible with energy storage systems, and interpret the necessity of photovoltaic anti backflow under policy guidance. Choose professional and reliable anti backflow solutions to help you safely increase efficiency on the path of green power generation, achieving a win-win situation for both economy and environmental protection.

Keywords:Distributed photovoltaics, energy storage control, anti backflow control, energy management, and protective devices.

1 Overview

In the current context,The installed capacity of distributed photovoltaics is increasing, and red zones have emerged in some places. Local power companies require the construction of new distributed photovoltaics for self use and take measures to prevent backflow. Photovoltaic backflow prevention has become an urgent need for some customers, mainly due to the following reasons:

(1) Driven by mandatory policy requirements

Distributed photovoltaic projects connected to the grid before the "430" node can continue to use the old policy, while projects connected to the grid after the "531" node need to implement new regulations, such as requiring 100% self use for industrial and commercial projects, forcing enterprises to ensure compliance through anti backflow technology.

(2) Technical necessity: Ensuring the safety and stability of the power grid

Intermittent photovoltaic power generation is prone to power fluctuations, and reverse flow may cause voltage rise, frequency abnormalities, etc., posing a threat to equipment safety. The anti backflow device can quickly cut off the circuit or adjust the inverter power when backflow is detected. The combination of anti backflow technology and smart meters can solve the measurement contradiction of traditional meters and meet the measurement requirements.

(3) Economic improvement and energy efficiency optimization

The flexible adjustment scheme can reduce the loss of abandoned light and, combined with peak valley arbitrage, lower the electricity cost for users. The relevant energy management system optimizes the synergy of light storage through algorithms, improves the spontaneous self use rate, and shortens the investment payback period. New energy projects after 531 need to be priced through electricity market transactions, and anti backflow technology can help enterprises adjust output and improve revenue stability.

(4) Diversified technical solutions adapted to scene requirements

The quick break solution has low cost and fast transformation, suitable for small household scenarios; The flexible adjustment scheme can achieve millisecond level power regulation and is suitable for complex scenarios with multiple grid connection points in industry and commerce. The smart energy platform integrates data, achieves collaborative optimization of source network load storage, and enhances asset appreciation space.

2. Project situation

The Amazon Zhongwei Data Center project exists in totalThree sites，The data from sites 50 and 52 is transmitted through the gateway to the 51FOC data center host for unified management and control.

50 sites Admin: 1 grid connection point, equipped with 4 inverters and 1 energy storage cabinet. 51 Station Admin: 1 grid connection point, equipped with 4 inverters and 1 energy storage cabinet. 51 CCU stations: 3 grid connection points, equipped with 3 inverters. 52 Station Admin: 1 grid connection point, equipped with 4 inverters and 1 energy storage cabinet. 52 CCU stations: 3 grid connection points, equipped with 3 inverters.

In the project, photovoltaics are connected to the low-voltage system at 0.4kV for grid connection. The customer requires that photovoltaic power generation is only used for the low-voltage part, and it is strictly prohibited to send it to the 10kV grid to affect the power quality of the higher-level grid.

The following are the drawings of the project:

According to the customer's requirements, this distributed photovoltaic project can only be consumed on-site and is prohibited from being transmitted to the 10kV power grid.

3solution

becauseThe project has a high demand for power quality from new energy sources connected to the system, so each inverter is equipped with an APView500 power quality online monitoring device,In order to achieve the above objectives,need toEach grid connection point is equipped with an AM3 anti backflow protection devicecomeMeasure and control the power output of the 0.4kV transmission lineWhen the power valueApproaching 15kWtimeBy using the Acrel-2000MG unmanned energy management system to dynamically adjust the inverter output power in real-time, the photovoltaic power station can operate continuously, while also ensuring the safe and reliable operation of the output power energy management system. When the Acrel-2000MG dynamic adjustment of the output power energy management system fails, it can automatically cut off some photovoltaic power generation circuits to ensure the normal power supply of the 0.4kV line, and can automatically restore the normal operation of the energy management system and automatically cut off some inverters to restore operation.

The typical configuration of the plan is as follows:

The system networking diagram is as follows:

4. Plan effect

The Acrel-2000MG energy management system is applied in a photovoltaic backflow prevention project in a data center, which integrates distributed energy to build a unified monitoring and management system. The system dynamically regulates the output power of each photovoltaic unit based on real-time load demand in the data center. Before the anti backflow comprehensive protection action, flexible control is achieved through inverter power adjustment instructions to ensure zero backflow grid connection of photovoltaic power. Actual operation shows that the power of the public connection point is accurately maintained at the set threshold of 15kW, eliminating the risk of backflow, avoiding the impact on the normal power supply of the higher-level power grid, and affecting the power quality of the higher-level power grid. This solution synchronously enhances the stability of microgrid systems, creating a compliant and economical green energy paradigm for high computing power density data centers, achieving a dual value upgrade of power supply reliability and low-carbon operation.

The human-machine interaction interface equipped in the system adopts a visual design of electrical primary diagrams, allowing management personnel to intuitively view the operating status of various electrical circuits and monitor real-time electrical parameters such as photovoltaic circuit voltage, current, power factor, etc. Through the distributed power generation management module, it is possible to real-time grasp the output curve and revenue data of power generation units, as well as dynamically adjust the power generation settings, building a full process energy control system of "visual monitoring intelligent regulation digital management" for data centers, and assisting in the fine operation of green power in high computing scenarios.

5. Conclusion

The implementation of the photovoltaic anti backflow project in this data center relies on the intelligent control system of Acrel-2000MG microgrid energy management system, which not only achieves a high proportion of self use of photovoltaic energy, but also ensures the stability of power supply in the data center through power regulation. The scheme adopts a dual-mode design that combines rigid regulation of comprehensive protection with flexible regulation of energy management system. While meeting policy compliance requirements, it reduces the number of trips of anti backflow comprehensive protection and lowers the proportion of abandoned light.

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