1.项目背景Background

随着光伏行业的发展，部分地区村级变压器及工业用电变压器容量与光伏项目的装机容量处于饱和。电网公司要求对后建的光伏并网系统为不可逆流发电系统，指光伏并网系统所发生的电由本地负载消耗，多余的电不允许通过低压配电变压器向上级电网逆向送电。

With the development of photovoltaic industry, the capacity of village-level transformers and industrial power transformers and the installed capacity of photovoltaic projects are saturated in some areas.The power grid company requires the photovoltaic grid-connected system to be a non-backflow current generation system, which means that the electricity generated by the photovoltaic grid-connected system is consumed by the local load, and the excess electricity is not allowed to be sent to the upper power grid through the low-voltage distribution transformer in reverse direction.

光伏逆变器在将光伏组件产生的直流电变换成交流电时，会夹杂有直流分量和谐波，三相电流不平衡，输出功率不确定性等，目前基本没有采取有效的治理手段，因此，当有发电功率送往公用电网时，就会对电网产生谐波污染，易造成电网电压波动，闪变等，如果有许多这样的发电源向电网输电时，会导致电网电能质量严重下降。所以这类光伏发电系统必须配套加装防逆流设施，来防止逆功率的发生。

Photovoltaic inverter in photovoltaic components will produce direct current into alternating current (ac), has the dc component and harmonic mixing, unbalanced three phase current, output power of uncertainty, such as the current basic didn't take effective management measures, therefore, when there is power to the utility grid, will generate harmonic pollution to power network, easy cause power grid voltage fluctuation and flicker, etc.,If there are many such power sources to transmit electricity to the grid, the power quality of the grid will be seriously degraded.Therefore, this kind of photovoltaic power generation system must be equipped with anti-backflow current facilities to prevent the occurrence of reverse power.

当光伏发电量大于负载需求电量时，会产生逆功率。因此，我们需要仪表来判定。逆变器有过功率输出，再由仪表通过RS485通讯发出信号和逆变器数据交互，调节逆变器输出功率，使其输出功率和用电功率平衡。

When the photovoltaic power generation is greater than the load demand, the inverse power will be generated.So we need instruments to determine that Inverter has power output, and then by the instrument through RS485 communication signal and inverter data interaction, adjust the inverter output power, so that its output power and power balance.

2.项目概述Project Overview

菲律宾一家做光伏发电的公司，联系到我司，寻找防逆流电表  ， 对接协议合适后， 采购我司的ACR10R-D16TE.

A photovoltaic power generation company in the Philippines contacted our company to look for anti-backflow current meters. After proper connection agreement, we will purchase ACR10R-D16TE from our company.

 3.防逆流检测仪表Anti-backflow detection meter

当光伏发电量大于负载需求电量时，会产生逆功率。因此，我们需要仪表来判定逆变器有过功率输出，再由仪表通过RS485通讯发出信号和逆变器数据交互，调节逆变器输出功率，使其输出功率和用电功率平衡。

When the photovoltaic power generation is greater than the load demand, reverse power will be generated. Therefore, we need an meter to determine that the inverter has over-power output, and then the meter sends a signal through RS485 communication to interact with the inverter data to adjust the output power of the inverter to balance the output power and the electrical power.

4.功能Function 

5.接线Wiring

6.典型链接 Typical Connection

参考文献 Bibliography

1.Solutions for enterprise micro-grid system