Hierarchical models in power systems analysis & control

Abstract

In this paper the functional modeling (FM) method developed for efficient solution of simulation, planning and control problems in large power systems and interconnections is presented. In the first part of the paper outline of the FM method is given. According to the FM method a power system is represented by hierarchical model, consisting of systems of equations of subsystems (lower level) and system of equations of higher level, in which only boundary variables of subsystems are present. Next part of the paper is devoted to description of hierarchical algorithms for solution of power flow , optimization and stability analysis problems of power systems, based on the FM method. It is shown in the last part of the paper how general structure of the FM algorithms and principles of the FM method are used to form the basis, on which construction and functioning of distributed control system assuring optimal operation control in large integrated electrical power systems is founded.

Hierarchically distributed architecture for large-scale integrated WAMPAC system

“…This hierarchical model is based on systems of equations of subsystems (lower level) and system of equations of a larger system (higher level), in which only boundary variables of subsystems are present. Then, a large-dimension optimization problem can be reduced to one of smaller dimension [4], [5].…”

“…In [5] power flow distributed solutions, optimization and steady-state stability problems in large power systems are proposed, and in [4] a decomposition method is used for solving an optimal current flow problem. In [5], the configuration of the distributed control system (See Fig.…”

“…Distributed solutions of the operation and control problems in a large power system enables optimal control of power system as well as enables maintaining functions and independence of SO control centers [5].…”

“…Then, distributed dynamic state estimation (DDSE) is proposed, which should be the first stage of the required dynamic data Figure 2. Distributed control system for hierarchical models [5] processing for accomplishing wide-area protection and control applications in a distributed way.…”

Coordinated monitoring of large scale interconnected power systems

“…The advantage of this architecture based on developed algorithms is that only boundary values are exchanged. Internal values can be kept as private [21]. In conclusion, a multilayer architecture for large scale power systems consists of conventional monitoring technology and including time synchronized measurement for WAMS.…”