高采样率数字化变电站电能质量监测系统研究与应用

为解决目前数字化变电站中应用的数字式互感器和合并单元的采样特性无法满足高次谐波和电压暂态事件监测分析等难题,提出了一种具有512点/周波高采样率的数字化变电站电能质量在线监测系统。该系统采用新型高采样率电子式互感器、合并单元和数字式电能质量监测装置,从过程层互感器层面解决采样率低的问题,同时解决了电子式互感器和传统互感器的同时接入、采样率提高后海量数据处理、数字式电能质量监测装置IEC61850建模、合并单元和数字式电能质量监测装置全自动校准等问题。校准试验表明该系统满足电能质量监测功能和准确度标准要求,并且在实际工程中取得良好的效果。

Research and application of digital substation power quality monitoring system with high sampling rate

In order to solve the problem that current sampling characteristics of EVCT and MU cannot fulfill the practical demand of power quality analysis such as high-frequency harmonics and voltage transients in digital substations, this paper proposes a new power quality monitoring (PQM) system for digital substation with high sampling rate of 512 points / cycle. By use of new high-sampling-rated EVCT, MU and PQM equipment, the problem of low sampling rate is solved from the beginning of EVCT in process level. Other problems such as retrieving data from both EVCT and traditional transformer, mass data processing derived from high sampling rate, IEC 61850 modeling of digital PQM equipment, automatic calibration of MU and PQM equipment are analyzed and solved at the same time. Calibration result shows that this system can meet the function and accuracy standard and practical application of this system has achieved good results.