Research On Coordination Control For Microgrids Based On MAS

With the promotion of distributed generation technology and the raise of theproportion of the renewable energy in generation, it not only increased the numberof the control variables of the power system, but also brought in the uncertainty ofthe dynamic environment. Traditional methods of the power system areincreasingly not adapted to it. This problem can be solved by using a systematicapproach to treat the generation, load, storage and the control equipments as aMicrogrid, which can be controlled like a standalone system.Due to the uncertainty of the dynamic environment and less inertia in theMicrogrid, Microgrid is more vulnerable to the reliability problem. So it is urgentto have a Energy Management System (EMS) to optimize the operation ofMicrogrid. Because of the requirements of low running costs and the“plug-and-play” capability, the centralized control method, which is flexible andopen enough, is not suitable for the Microgrid EMS(MG-EMS). While MG-EMSbased on MAS has the features of on-demand cooperation and loosely couple and itfulfills the requirements of MG-EMS. MG-EMS comprises energy cooperationcontrol, load forecasting, weather forecasting and power flow optimize, etc. Andthe energy cooperation control is the basic and core function of it, this paper do theresearch on the this control method.First, the basic control method and the quasi-steady-state economic model forcalculating the power output of micro-sources is studied. Based on the hierarchicalcontrol theory, the Microgrid tropical energy cooperation control mechanism isproposed. And the foundation for digital simulation of the coordination control forMicrogrids is built. Second, the MAS model of MG-EMS is introduced, whichincludes the division and definitions of the agents. And these agents are organizedwith federation-architecture. Last, based on the general communication protocoland the multi-factor evaluation mechanism of agents, the protocol for cooperationamong agents in Microgrid energy cooperation control is proposed. Then theMicrogrid tropical energy cooperation control is achieved with the methods ofAgent Local Control, Contract-Net Protocol (CNP) of several agents and marketbidding protocol of whole Microgrid specifically. And by the clients-server frame,the platform for MAS Microgrid control is developed in the C++Builder softwaredevelopment environment, which is also integrated with the physical test platform. The energy cooperation control methods are simulated and the feasibility andeffectiveness are verified on this platform. The method of Microgrid energycooperation control based on MAS insures the stable operation of the Microgridunder the premise of the openness and flexibility of MG-EMS. It facilitates thepracticable application of MG-EMS, increases the openness, reliability andeconomy of Microgrid and lays an important foundation for the practicalapplication of the Microgrid.