Multi-Strategy Micro Network Access Control

With the development of science, economy, energy and environment, building a safer, more reliable, more environment friendly and more economical electric power system has become the common goal of the global power industry. Therefore, the concept of smart grid was put forward. The smart grid include the generation, transmission, distribution and scheduling of electricity. As micro-grid is a significant part in the development of future smart grid, researches focusing on operation efficiency, intelligent control and smooth transition with the main distribution network are of great importance in advancing micro-grid technology.This paper studies multi-micro-grid control strategy based on IP and MAS and a thorough discussion of research methods and implementation processes of the strategy is presented. Covered in this paper are micro-grid modeling, the realization of multi-agent systems (MAS) and the setup of intermediate server. The simulation model of the micro-grid is built via Matlab/Simulink and it is equipped with a micro-grid structure and a main network power. The micro network structure includes distributed power source, critical load, non-critical load and a number of other circuit devices. The implementation of multi-agent systems is achieved through ZEUS development platform. The planning process of MAS is carried out step by step from analysis of MAS to design of MAS and to the realization of MAS. Intermediate servers are deployed to connect micro-grid to multi-agent systems. And this connection enables information exchange.This paper discriminates micro-grid networks to three levels which are important, less important and unimportant. The design, development and implementation of real-time control over multi micro-grid networks by MAS are all based on the afore-mentioned discrimination.When the power of distribution network lowers, management of micro-grid networks are based on the importance of the relevant networks.In case of emergency, the power supply of critical micro-grid networks is maintained.After the restoration of electrical accidents, micro-grid networks can be smoothly connected to large power grids.In this paper, smart control of micro-grid networks is rendered possible via multi-agent systems. Changes in main power supply network will be detected and appropriate measures will be taken to control the running status of the main network and micro-grid networks. Thus seamless transitions between the main network and micro-grid networks from island mode to grid mode are made realizable. The time it takes for these transitions to finish is around0.02second. The total harmonic voltage of the micro-grid is within5%. The side voltage of the main network is within4%. These parameters are all up to national electricity industrial standards. This paper acts as a proof that control over micro-grid networks is possible through multi-agent systems. And this kind of control creates an efficient and plausible coalition running environment for micro-grid networks and the main network.