Research On D-STATCOM New Control Strategy And Its Application Optimization

With the rapid development of economy in our country,the demand for electricity load in various industries increases sharply,and the scale of the power system also increases.Especially in remote heavy industrial areas and agricultural areas,the power grids in these areas have a long radius of supply and a relatively scattered load,which is greatly affected by the seasonal time.As a result,reactive power compensation measures are not easy to reach.Therefore,to ensure the stable,safe and efficient operation of the power system,it is important to do an accurate,flexible and rapid compensation of reactive power demand in distribution network.Distributed Static Synchronous Compensator(D-STATCOM),can follow load changes in real time and has broader application range and shorter compensation time than traditional compensation devices.Better improve the loss and power quality problems in the distribution network.The main research content are as follows:In this dissertation,the principle and structure of reactive power compensation of D-STATCOM are analyzed firstly,and the relevant dynamic mathematical model is established.The basis of related control theory is introduced in detail.Based on the research of automatic disturbance rejection control(ADRC)technology,there is a coupling between the amount of control in the D-STATCOM device,which affects the control effect,linear ADRC is put forward in this paper,it can make the coupling as a disturbance,the d-q axis in the D-STATCOM model is fully decoupled.Based on the model of D-STATCOM,the q-axis is taken as an example to design a first-order linear ADRC controller and to prove its stability.Set up the actual circuit simulation model to verify the effectiveness of the control system in this paper,as well as improve the compensation control performance of D-STATCOM and improve the power quality effectively.For practical application of D-STATCOM in distribution network,a reasonable optimization scheme will contribute to the actual compensation effect and economic operation of the device.This article takes into account the economy and power quality,the establishment of a comprehensive annual fee(including annual loss costs,equipment investment and operating costs such as annual cost)as the minimum optimization goal,Particle swarm optimization algorithm is used to optimize the configuration of D-STATCOM,and the validity of the model and the method are verified by classical examples.