Effectiveness Evaluation Of Voltage Control Strategy For Distributed Photovoltaic Distribution Network With High Proportion

In recent years,with the transformation of China’s energy structure and more stringent requirements for carbon emissions,the development and utilization of new energy has become the main development trend of China’s power industry.A large number of distributed photovoltaic(DPV)are connected to the distribution network,which causes voltage fluctuation and overrun and other prominent problems in the distribution network.The traditional equipment and control strategy for voltage regulation has been difficult to meet the current demand.Therefore,the strategy of voltage regulation using the bidirectional reactive power of photovoltaic inverter has been proposed.At the same time,how to analyze and evaluate the effectiveness of various voltage regulation strategies becomes a necessary work.From the perspective of the effectiveness of voltage regulation strategies to improve the voltage quality of distribution network,this paper puts forward the voltage evaluation system,photovoltaic access uniformity and scene construction method of distribution network,establishes the distribution network model based on Open DSS,evaluates and compares the common voltage regulation strategies of distribution network,and the evaluation results reflect the effectiveness,advantages and disadvantages and application of each voltage regulation strategy.Firstly,the characteristics and principles of common distribution network voltage regulation strategies are analyzed in detail,and a mult-index distribution voltage evaluation system is constructed from two aspects of single node and distribution network as a whole,which provides an evaluation standard for voltage regulation effectiveness evaluation.Using the real weather data of Tianjin in recent 10 years,the data are transformed into temperature,weather sensitive load and weighted normalization.The daily scene set composed of irradiance,temperature and related load data series is established by Kmeans clustering algorithm,which provides a differential evaluation environment.Secondly,considering the impact of different DPV access status and conditions in distribution network,this paper establishes the PV access uniformity index of distribution network,quantifies the DPV access situation of distribution network from the perspective of access location,access distribution and penetration rate,and explores its correlation with voltage quality by using the voltage quality evaluation system established in this paper.In addition,in the case of different PV penetration and PV distribution location,the influence of distribution network voltage quality is analyzed and studied in IEEE-33 distribution network model.Finally,five voltage regulation strategies are simulated,which are no voltage regulation,voltage regulation strategy of distribution network substation,DPV droop voltage regulation strategy,voltage regulation strategy considering distribution network capacitor and reconfiguration and voltage regulation strategy of multi voltage regulation equipment considering DPV.The simulation is carried out under the condition of scene set and different uniformity.Finally,the voltage evaluation index of each voltage regulation strategy is obtained,Thus,the advantages and disadvantages of each voltage regulation strategy under different conditions are compared and analyzed.This study provides a platform and ideas for exploring the effectiveness evaluation of various voltage regulation strategies,which has guiding significance for the optimization of voltage regulation strategies in different situations,and has practical application value.