Study On Topology Of Hybrid Compensation Systems

In recent years,with the rapid development of high-speed railway and urban rail transit,more and more nonlinear,large capacity load connected to the power system,harmonic pollution control and reactive power compensation have become an urgent problem for power system.As a kind of harmonic,reactive power and negative sequence comprehensive compensation device,hybrid compensation systems have been widely concerned because of its large capacity,low cost and good compensation effect.The topology of the hybrid compensation system determines the compensation characteristics and the capacity characteristics of the equipment,while the capacity characteristics and the compensation characteristics determine the cost of the system.So to study the compensation system topology is of great significance to design hybrid compensation systems.Aiming at the problem of imprecision and incompleteness in the existing study of identification of hybrid compensation topology,a new computer identification method of hybrid compensation network topology is proposed.The adjacency matrix model of compensation network single-phase equivalent circuit is established by graph theory.Be aimed at reflecting the branch information in the compensation network topology comprehensively and accurately,the novel adjacency matrix and its generating method are proposed.The novel adjacency matrix is analyzed.According to the effectiveness of electrical connection of the circuit,the identification conditions of the compensation network are given.After the characteristics of adjacent matrix and novel adjacent matrix are analyzed,the identification program for hybrid compensation system is developed.The topology of hybrid compensation network with 2 or 3 types of compensation elements is identified and analyzed.The results showed that the proposed method could identify the compensation network automatically.It was more general,comprehensiveness and accuracy,and provided the reference for proposing practical new type of topology and compensation network.There are impractical structures in the identified topology,so the connection characteristics of the compensation elements are analyzed.The connection characteristics of active component and passive component are analyzed,and the constraint conditions of practical topology are summarized.The computer topology analysis method in two cases is also given.Finally,the results of computer analysis,constraint condition analysis and repeated topology analysis are compared,which shows the computer analysis can reduce the manual analysis amount.The compensation and capacity characteristics of hybrid active filter with two or three elements are analyzed.The selection methods of equipment in different application scenarios are described briefly.