Research On AGC Method Of Multi Area Interconnected Power Grid Based On BAS-MPC And Fractional Order PID Hierarchical Architecture

Nowadays,there are great differences between social development and people’s awareness of environmental protection,which makes the rapid rise of new energy power generation,including wind energy,and also brings adverse effects on the safe operation of power system.On the one hand,due to the randomness and uncertainty of wind energy and other new energy power generation,automatic generation may exist when wind power is integrated into multi regional interconnected power grid On the other hand,when the system is disturbed and cross regional power dispatching is needed to support the area with insufficient frequency regulation capacity,the operation cost of interconnected AGC system will increase sharply.Therefore,this paper will design a hierarchical structure control method based on model predictive control(MPC)algorithm and PID controller,which can quickly suppress the system frequency fluctuations caused by multiple types of disturbances,and optimize the allocation of frequency regulation resources among multi regional AGC units,so as to make the power system stable and economical.The main research contents are as follows:Firstly,the basic structure and control process of AGC system are described,and the relationship between AGC and power system frequency regulation is studied.At the same time,according to the control objectives of AGC system,the appropriate control mode of interconnected AGC system is analyzed and selected.The dynamic model of single area AGC system is constructed from the models of AGC components,and the dynamic model of multi area interconnected AGC is further established.Secondly,the basic concept of MPC algorithm and bee antennae search(BAS)algorithm are introduced.The bas-mpc controller is designed by combining the above two algorithms,and a two area interconnected AGC system including bas-mpc is established.Taking the system as an example,the control performance of bas-mpc controller is simulated and analyzed.Thirdly,based on the bas-mpc controller,a hierarchical control strategy of inter regional interconnected AGC is proposed.Under the control strategy: when the system is disturbed and the frequency regulation capacity in the region is insufficient,the basmpc controller is used to realize the optimal allocation of steady-state power of AGC units across regions in order to optimize the scheduling cost increment in the upper layer,and the distributed Fractional Order PID controller is used to realize the dynamic frequency control of AGC units in each region in the lower layer.Finally,the simulation is carried out on the MATLAB / Simulink platform,and the control strategy is applied to the above three scenarios,including different load step disturbance,random disturbance of wind farm output power and different wind power penetration.The experimental results show that the control strategy has advanced control performance and can greatly optimize the cost increment of cross regional power scheduling.Compared with the traditional AGC method,it has greater advantages.