| With the wide application of information and communication technology in the power grid,information and communication technology has penetrated into all aspects of power grid infrastructure and application regulation,which is not only conducive to enhancing the monitoring and control capabilities of the power grid,but also conducive to the interaction between the power grid and users to optimize resource allocation,the integration and cooperation of the information network and the physical power grid has become one of the important features of the future smart grid,which constitutes a typical cyber-physical system.However,the interdependence of the information network and the physical power grid brings convenience,but also brings many hidden dangers to the operation and regulation of the power system.The information network has the problem of communication delay,which is easy to make the performance of the system controller deteriorate or even reverse,resulting in the instability of the system.In order to effectively suppress the low-frequency oscillation of the wide-area interconnected power system and overcome the adverse effects of the time delay in the communication network on the stable operation of the power cyber-physical system,this paper conducts a wide-area damping control of the power system under the power cyber-physics fusion architecture.The specific research contents are as follows:First of all,based on OPC technology,the joint operation of the power system simulation tool DIg SILENT and the information system simulation tool MATLAB is realized,and a power cyber-physical system simulation platform is established,which can effectively reflect the interaction between the information system and the physical system in the system.The analysis and compensation of the hysteresis and the design of the wide-area damping controller provide the platform support.Secondly,the state space model of the multi-machine power system is established,and the prediction equation and objective function of the Model Predictive Controller（MPC）based on the state control model of the system are deduced.The damping controller design method uses the model predictive controller for wide-area additional damping control,and coordinates with the local PSS to achieve dynamic coordination between voltage regulation and enhanced damping to improve the dynamic steady-state performance of the system.Finally,in order to compensate the adverse effects of the time delay existing in the power cyber-physical system,an adaptive time delay compensation method is proposed,and a time delay compensator（TDC）is designed by using the Simevents toolbox in MATLAB.The compensator can effectively compensate the phase deviation caused by different delays,thereby compensating for the random time delay existing in the communication and improving the performance of the wide-area damping controller.Through the co-simulation analysis on the platform,it is shown that the wide-area damping control using the time delay compensation method can effectively suppress the interval low frequency oscillation of the interconnected power system under the adverse influence of the random time delay existing in the information system. |
