Automatic Generation Control Method Of Smart Distribution Network Based On The Theory Of Multi-agent Consensus Coordinated Control

With the development and utilization of small-size, low-carbon, unconventional renewable energy, which usually access to the low voltage distribution network as distributed generation(DG), the traditional passive distribution network with one-way power flow has been turning to active distribution network with two-way power flow. The safe and efficient utilization of renewable energy is based on flexible and intelligent control system and advanced distribution technology, and it is imperative to build the smart distribution network.Firstly, this paper analyzed the domestic and foreign research status of smart distribution network and automatic generation control(AGC) of smart grid, and prospected the application of multi-agent consensus algorithm in AGC of smart distribution network. Then generation principle, structure, mathematical model of common DGs were studied, and the feasible approach and principle for DG cutting in distribution network were discussed, and with reference to the domestic and international micro-grid demonstration project and analysis of the characteristics of DG, several typical micro-grid structures were studied, and relevant evaluation index was given, then a physical-cyber model of smart distribution network with several micro-grid was built, and the corresponding load frequency control(LFC) model was also established. Via analyzing the demand of active power dispatch and frequency autonomy of distribution network with high permeability of DG, the key technologies of distribution network automatic generation dispatch and control were discussed, which conclude accurate prediction technology and perfect power prediction system, safe, high speed two-way communication system, efficient demand side management technology, as well as the new smart generation control technology. Subsequently, a decentralized autonomous framework of smart distribution network and an AGC power optimization dispatch method—equal incremental principle consensus coordinated control algorithm were presented, and virtual consensus variable was designed to solve the topology update problem when AGC order exceeds the unit’s limit, and to implement the plug and play of AGC units. A variable convergence coefficient method is presented to improve the convergence rate. At last, the robustness of consensus coordinated control algorithm under non-ideal communication environment was studied, the effect of gain function to communication delay and noise was discussed, and the robustness of consensus coordinated control algorithm under communication packet loss and communication failure environment was studied, the simulation results showd that the presented algorithm is robust.