![]() However, some local measurable variables that are very meaningful for designing component controllers (as feedback variables) are not used, such as the amplitude of terminal voltage and the active and reactive powers. For example, when analyzing the interconnection relations between components and AC grid, the current and voltage vectors are normally used to describe the relations. In the area of structural analysis of power systems, there is a prominent phenomenon, which is that the analysis purpose is mainly for system’s analysis and simulations, and little attention is paid to the needs of other issues (such as designing control strategy). For example, in, under the platform of the AnyLogic Simulation Software, the hierarchical characteristics are investigated in, the concept of multilevel MATE (Multi-Area Thévénin Equivalent) is proposed, and thus power system networks could be partitioned into multilevels in, a power system is decomposed and described by a component tree, which is valuable for the computation parallelism and programming flexibility. In recent years, in order to satisfy the demand of large-scale numerical simulations (such as parallel computation, etc.), the analysis of the complex topology and hierarchical structure of modern power systems has drawn more attention. In, the relations among subsystems of power systems are investigated, but the results have not been extended to the analysis of more hierarchical levels and are less flexible. However, there are seldom literatures discussing the hierarchical structural characteristics of modern power systems. In the early time, when constructing the structure preserving model (SPM) and component connection model (CCM), the “planar” structural characteristics or the interconnection relations between components (mainly generators and loads) and AC grid are analyzed. For example, (1) power system is a large-scale system (2) the topology of power system is very complex and power systems are normally with multilevel/hierarchical structures (3) various components of power systems are interconnected with each other via electrical network (not interconnected directly), and without considering electromagnetic effect, power systems’ networks follow basic principles of electrical networks.Īiming at the specialties of power systems, a lot of work has been done to analyze the structure of power systems. ![]() There are some important specialties that should be considered when analyzing the structure of power systems. IntroductionĪnalysis of the structure of power systems is a very important task for many problems, such as the time-scale simulation, control strategy design, and so forth. The constructed hierarchical model can reveal the self-similarity characteristic of large-scale power systems. Then, the structural models of various hierarchical levels are constructed in a bottom-up manner. ![]() The proposed decomposition method is suitable for arbitrary system topology, and the relations among various decomposed hierarchical levels are explicitly expressed by introducing the interface concept. Firstly, the large-scale power system is decomposed into various hierarchical levels: the main system, subsystems, sub-subsystems, down to its basic components. ![]() Some fundamental structural characteristics of large-scale power systems are analyzed in the paper. ![]()
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