Comprehensive Power Quality Evaluation Method for AC/DC Distribution Network Considering the Coupling Effect of Both Sides
AC/DC distribution network fully combines and gives play to the advantages of AC and DC power supply,which is the inevitable development trend of new distribution network.Aiming at the shortage of accuracy and comprehensiveness of the current power quality comprehensive evaluation system of AC/DC distribution network,a comprehensive evaluation method considering the coupling effect of AC/DC power quality is proposed.Firstly,based on the power quality phenomenon of AC/DC distribution network,a comprehensive power quality evaluation index system is established.Secondly,based on the influence of source charge characteristics on the power quality of distribution network,combined with the short-circuit ratio coefficient of each source charge node,the improved analytic hierarchy process is used to calculate the subjective weight of power quality evaluation indicators on both sides of AC and DC.The entropy weight method is used to determine the objective weight according to the sampled data of power quality indicators on both sides,and the sampling equilibrium algorithm is combined with the subjective and objective weights.Comprehensive power quality assessment is carried out to avoid the one-sidedness of power quality assessment based on a single weight and further improve the accuracy of the assessment results.Then,the coupling effect of AC and DC power quality is fully considered and de-coupling is carried out,and the de-coupling voltage of AC and DC power quality is comprehensively evaluated.The power quality problems in AC-DC distribution network are quantitatively analyzed and graded evaluated,and a set of comprehensive evaluation system of power quality in AC-DC distribution network is established,which provides certain decision support for the subsequent analysis and management of power quality problems in AC-DC distribution network.Finally,a simulation model is established in Matlab/Simulink to verify the feasibility and effectiveness of the proposed method.
AC/DC distribution networkpower qualitycoupling effectcomprehensive evaluationsubjective and objective weight
NETL
NSTL
万方数据
