Research On Multi-Scenario Sizing And Siting Of Wind Turbine Based On Voltage Sag

In view of the growing seriousness of the greenhouse effect and a series of th e problems of insufficient power supply in the distribution network caused by China’s high urbanization speed,China has also proposed a series of new energy-related policies to adjust the current energy consumption structures and the use proportion of clean energy.It is imperative to enhance the power generation capacity of various types of clean energy.However,the use of clean energy has both advantages and disadvantages.Considering the intermittence and uncertainty of wind turbine output and its impact on the distribution network,how to reasonably select the wind turbine access scheme is one of the current research focuses.At present,more than 90%of power quality problems are caused by voltage sag.Moreover,the emergence of voltage sags may make the distribution network and sensitive loads unable to maintain normal operating conditions,thereby causing certain economic losses.Therefore,considering that the access of distributed power has a certain mitigation effect on voltage sags,this article proposes a distributed power constant capacity based on wind turbines,which aims to alleviate voltage sags and considers the timing of wind turbine output.First of all,this article adopts the multi-scene analysis method to realize the simulation and calculation of the wind turbine output sequence.In the scene generation part,based on the original multi-scene analysis method,this paper proposes a scene generation method based on the similarity of curve changes.In the scene reduction part,this paper proposes a scene reduction algorithm based on DPC&k-means.In addition,in order to analyze the impact of the number of clusters on the clustering results,this paper uses the cluster validity index CH(+)to objectively evaluate the impact of the cluster number on the clustering results,and confirms the effectiveness and rationality of proposed scene reduction algorithm.Secondly,based on the relationship between Clark transformation,voltage ellipse parameters and voltage sag,this paper uses the fault point method to realize the analysis of the voltage sag of the distribution network which containing wind turbines.And based on the above analysis process,the evaluation index of the voltage sag frequency of the bus is proposed from the perspective of the victim.In addition,The economic loss evaluation index of the sensitive load voltage sag considering the time sequence of the wind turbine output is also proposed,which is taken as one of the evaluation objectives of the sizing and siting mathematical model of wind turbine.Finally,taking wind turbines as the experimental object,this paper establishes the multi-objective sizing and siting optimize the mathematical model of wind turbines from three perspectives:the basic costs of wind turbines,the economic loss of voltage sag and the economic loss of grid loss.And the elite sampling algorithm are used to solve the mathematical model proposed in this article.The simulation results based on IEEE 33-bus system shows that the reasonable access of wind turbines can help to reduce the loss of the distribution network and the influence level of voltage sags which can ensure the safety of the system economic operation.