Design of a delay dependent wide area damping controller using Cyber–Physical Power System architecture

Abstract

With the wide application of information and communication technology in power grids, the integration and collaboration of information networks and physical grid have become an essential feature of the smart grid, constituting a typical power information physical system. However, information network has communication time delay problem, which tends to deteriorate the system controller performance or even counter-tune, leading to system instability. To effectively reduce low-frequency oscillation of the wide-area interconnected grid and overcome the negative impact of the communication network’s delay problem, a delay dependent Wide Area Damping Controller(WADC) is designed using cyber–physical power system architecture. First, we establish a power information physical system simulation platform based on Object linking and embedding for Process Control (OPC) technology, implementing the joint operation of the power system simulation tool DIgSILENT and the information system simulation tool MATLAB. The platform can effectively respond to the system’s information system and physical system interaction effects during simulation. Then, to compensate for communication delays in the power information physical system, this paper proposes a new WADC strategy that uses a Model Predictive Controller (MPC) to generate control commands and an adaptive time delay compensator to compensate for the random communication delays generated in the communication. Finally, a case study with various uncertainties and through the interference test of a four-machine system and 39 bus system, the proposed control strategy is proposed.

Keywords

• Cyber–physical system
• Time delay compensation
• Model predictive control