Analysis On The Operation Effect Of PV Power Station Connected To Power Grid And Study On Power Quality Assessment

Photovoltaics(PV)power generation is one of the important development directions of new energy sources in the future.Its large-scale access to distribution network has led to the evolution of traditional passive distribution system into a distribution system characterized by multi-power supply,which has increased the uncertainty and complexity of grid operation.Therefore,It is of great practical significance to carry out the analysis of the operation effect of PV power station after it is connected to the power grid and to evaluate the power quality.This paper starts with the calculation of the power flow of PV power station connected to distribution network,in order to analyze the influence of power output uncertainty on power network operation.A new distribution power flow calculation method based on the combination of Monte Carlo and the forward push back method is used to analyze the network loss and voltage operating level of the optical voltage-power station after it is connected to the power network.Secondly,the objective function of coordinated optimization of reactive power in distribution network with maximum active output and minimum network loss is established.The model is solved by the mixed integer second-order cone programming method,and the influence factors on the access of optical power station are analyzed.The maximum permeation level of PV power station is obtained by considering the factors such as network loss,voltage running level,and three-phase imbalance.Finally,based on the actual grid operation data,the voltage deviation,voltage fluctuation,flicker,harmonic and other power quality indexes of the actual photovoltaic power station connected to the grid in a certain area are evaluated and analyzed,from the evaluation of the performance of the results to choose the best form of power supply,while establishing relevant effective control measures,in order to meet the basic premise of the relevant power quality,as far as possible,standardize and rationalize the related power quality operation indexes in the process of grid-connected operation of PV power plants.