基于IEC61850-9-1的电能数字算法研究.pdfVIP

学兔兔 总第49卷 第554期 电测与仪表 Voll49 No．554 2012年 第2期 ElectricaI Measurement Instrumentation Feb．2012 基于IEC 6 1 850—9—1的电能数字算法研究 王乐仁，雷民，章述汉 (国网电力科学研究院，武汉430074) 摘要：IEC 61850是数字化变电站光纤网络的传输标准，其中互感器部分的交流采样数字信号采用IEC61850—9—1 规约，在一个数据帧中包含i个相电压和三个相电流的采样信号。用三元件法计算电能时，数字化电能表的误 差表现为计算方法误差，为了保证电能量值的统一、正确以及软件的安全，需要对数字化有功电能与无功电能 算法进行标准化。针对电网电压与电流为非周期交流信号，不宜进行频域变换计算的特点，设计了一种时域算 法，该算法既适用于周期交流信号，也适用于非周期交流信号，除满足数字化电能表在电能表校验台稳定电源 条件下的校验外，在变电站现场使用时也能满足标称准确度的误差要求。对于无功电能，本文提出了无功电流 伴生理论，采用非电阻性电流的定义进行无功电能计算。其计算结果对于无功补偿具有工程实用价值。 关键词：算法；数字化电能表；数字化变电站；无功功率 中图分类号：TM933．3 文献识别码：A 文章编号：1001—1390(2012)02—0013—06 Research on Electric Energy Algorithm by IEC 61850-9-1 Protocol WANG Le—ren．LEI Min．ZHANG Shu—han (Electric Power Research Institute of SGCC，Wuhan 430074，China) Abstract：At a digital substation there are optical fibers to transmit digital signals which were sampled from VTs and CTs in protocol by IEC 6 1 850-9-1． I1he Energy meters linked on nets take the data frames then‘calculate active and reactive electric energy based on digital data．For purpose of unification and correctness of process as well as safety for soft ware，a standard algorithm has to be put forward．It was realized in this paper for time domain solution to suite the environment of power nets in which frequency and current are unstable．What’s more．the theory on accompanying induced current in non—sinusoidal pioriod circuit．It consistes not only components produced by capacitors and reactors，but also components produced by nonlinliear electrical elements．The calcuhion of reactive energy in a circuit should be based Oil accmpanying induced current．This algorithm on reactive energ