基于电力线载波通信信道阻抗的台区双电源切换感知技术

The sensing technology of dual power supply switching in transformer area based on impedance of power line carrier communication channel

“双电源单表计”问题指的是针对需要双路电源供电的终端负荷采用一个电能表计费的情况,该问题导致难以在双电源发生切换时确定此负荷的用电量计算在哪个台区。针对实际工作中由于营配融合沟通不畅会引起台区重要负荷双电源切换未能及时处理,导致线损不合格问题,提出一种基于电力线载波通信信道阻抗的台区双电源切换感知方法。当发生双电源切换时,负荷计量点所属台区的网络发生改变,通过双电源计量点注入的扫频信号感知此处的输入阻抗变化,从而实现双电源切换的自动辨识。在保护用户隐私的前提下,通过开发的主动采集识别终端注入载波信号实现对非电网资产运行工况的智能感知,并实现用户与电网的双向互动。通过设定合理的判定阈值,设计的多组验证性试验证明了所提出方法的有效性与科学性。

The problem of“dual power supply single meter”refers to the use of one energy meter for the terminal load requiring dual power supply, which makes it difficult to determine which transformer area the power consumption of this load is calculated in when the dual power supply is switched. In practice, due to the poor communication of marketing and distribution integration, the dual power supply switching of important loads in the transformer area can not be handled in time, resulting in unqualified line loss. A dual power supply switching sensing method based on power line carrier communication channel impedance is proposed. When dual power switching occurs, the network of the transformer area to which the load metering point belongs changes. The change of input impedance here is sensed through the frequency sweep signal injected by the dual power metering point, so as to realize the automatic identification of dual power switching. Through the active sensing method,the sensing function of dual power switching is increased while retaining the original metering function. By setting a reasonable decision threshold, several groups of confirmatory experiments proved the effectiveness and scientificity of the proposed method.