AGC Control For Interconnected Overlapping System Based On Dynamic Virtual Voronoi-Weighted Area Division

At present, our country is energetically promoting the constructionof intelligent grid engineering that is a complete system of power supply withtechnologies consisting of advanced sensor and monitoring, high performance networkcommunication, automatic control and grid infrastructure technology, tec. The network isto realize such fuctions as the coordination of interconnection, intelligent dispatching,power equipment compatibility, green economic, automatic fault diagnosis isolation andself-restoring capacity. In the new power supply system, automation generation control, asone of core technologies in the process of realizing the interconnection of tradital powersystem, will not adapt the new conditions that electric energy need to be coordinated andallocated dynamically while the whole system ensures the stability of power frequency.However a possibility of realizing dynamic allocation of power energy among grids havebeen awaken by the development of intelligent power relay system mixed together withadvanced sensing and communication technology, which requests more about automaticgeneration control. The core of the technology lies in dynamic virtual division of powersupply area and decentralized control for each subsystem to achieve the optimal efficiencyof power supply.The paper is to study an approach to automatic generation control with virtualdynamic area division based on Voronoi-weighted diagram.At first, the nearest area divisions attached to each subsystem are determined byVoronoi diagram, and the way of power transmission can be obtained by the comparisonbetween the weight of each subsystem and one within the nearest area division. Accordingto the above definition, a distributed rule for consultation among subsystems of powersupply is designed to allocate potential area of each subsystem by the consideration of thepriority of each power unit.The second，in order to adapt to the transient variation of each virtual area, adecentralized approach to automatic generation control based on inclusion principle isdesigned to eliminate the trubulence resulted by network switch. The method expands thesystem into pair-wise subsystems, and then ensures the stability of these subsystems byLQG control.Finally all pair-wise subsystems will be contracted into a system. We give anexample of distributed control and virtual area division for four erea of power system, andthe simulations and experiments show that the proposed methods can effectly realize the stability of power system frequency by the coordination between dynamic power systems...