Research On Optimal Control Of D-STATCOM Based On Active Disturbance Rejection Technology

As the world’s energy cleanliness and low-carbon processes accelerated,China’s energy achieved "carbon shoots" and "carbon neutralization" and faced new developments such as electricity,digitalisation and standards.This situation significantly changes the structure of the distribution system and increases pollution in the design and operation of the electrical system.Undamaged and irregular electrical charges are increasing and electricity quality problems are not working,harmonic and three-phase imbalances are becoming more and more pronounced.The Static Network of Modern Compensation Distribution(D-STATCOM)is an important type of equi_pment in the wrong compensation unit,which has achieved extensive use to improve the quality of electricity.This paper e introduces a research history and a brief understanding of DSTATCOM and describes the development of D-STATCOM and current control technology and at the same time describes in detail the current measurement technology,the management of D-STATCOM.The second chapter,the grid-connected structure of D-STATCOM is introduced,and the decoupling analysis of its structure is carried out by using Park transform,and its mathematical model in dq0 coordinate system is derived,which establishes the foundation for the control strategy and system analysis of subsequent research.On this basis,the PI parameters of D-STATCOM are optimized and adjusted.The third chapter detailed was deduced based on the traditional theory of instantaneous power of p-q test and i_p-i_q tests,and put forward a kind of improvement based on the angular frequency tracking grid i_p-i_q tests,the method can real-time tracking grid angular frequency and tracking signal involved in the current calculation,with fast response speed,improved the practicability and accuracy of test method.In the fourth chapter,in order to improve the performance of linear Active Disturbance Rejection controller(LADRC),the coupling problem between d axis and q axis current of D-STATCOM is solved,and the dynamic tracking response speed is improved.An improved LADRC based on compensating total disturbance error is proposed.The output of the fully disturbed channel is corrected to improve the antiinterference ability of the system and the ability of LESO to observe the interference of high frequency noise.Compared with traditional LADRC,the improved LADRC proposed in this paper has better anti-interference performance by analyzing bode graph in frequency domain.Finally,the improved first-order LADRC was used to replace the traditional D-STATCOM control strategy for current inner loop control,and the simulation model of D-STATCOM double closed-loop control system was established,which effectively reduced the disturbance observation error of LESO.Different types of fault conditions are designed on the network side.Through simulation analysis,the improved LADRC control has better tracking performance and anti-interference performance.