Test and Analysis Method of Transformer Loss in Composite Power Quality Environment Based on Grey Correlation Analysis
With the connection of distributed power generation and a large number of nonlinear loads to the power grid,the problem of power quality disturbance is becoming more and more prominent,and the loss of key equipment in the distribution network is seriously affected.At present,the transformer loss in the condition of multiple power quality disturbances is difficult to be accurately measured,and the loss influence degree of each transformer is difficult to be quantified by various power quality indicators.Therefore,according to the three typical power quality disturbance mechanisms of voltage deviation,three-phase unbalance and harmonic,a experimental platform which could simulate the actual operating conditions of the transformer and generate multiple power quality disturbance conditions was designed.In addition,the grey correlation analysis method was used to process the experimental data,and the correlation degree between each power quality index and transformer loss was obtained.The results show that the transformer loss will be affected by three power quality indicators,which will affect the energy efficiency of the transformer.The additional loss of the distribution network transformer is most significantly affected by the coupling between the three-phase unbalanced disturbance and other disturbances,while the additional loss is less affected by the coupling between the voltage deviation disturbance and other disturbances.This conclusion can be considered a valuable reference for the analysis of energy efficiency in distribution networks and the control of power quality.
power qualitytransformer lossloss testgray correlation analysisenergy efficiency experiment
万方数据
维普
