Bandwidth Awareness Related Event Triggered Robust Control on Power System With VSG-LFC Scheme Under Unreliable Network

Abstract

This paper investigates the frequency regulation problems with high level renewable energy sources (RESs) penetration under unreliable network. A virtual synchronous generator (VSG) incorporated with load frequency control (LFC) method (VSG-LFC) is proposed by introducing an adaptive event-triggered mechanism with the awareness of the bandwidth occupation rate (AETM-ABOR) to reduce the system sensitivity to the penetration level of RESs and achieve a balance between control performance and network resource usage under limited communication environments. Then, a Lyapunov-Krasovskii functional (LKF) with the two-sided looped functional terms is proposed to derive criteria that satisfies the $H_{\infty }$ performance index and controller design. Finally, simulation evaluations on numerical models and a two-area four-machine power system are conducted to verify the availability and effectiveness of this development. Note to Practitioners—This paper was motivated by the problem of frequency regulation. As the penetration of RESs into the power system is gradually increasing, the lack of inertial characteristics of power electronics that connect RESs to the power system poses a threat to the frequency stability of the power system. A VSG-LFC strategy is applied to effectively compensate the equivalent system inertia. Meanwhile, an adaptive event-triggered mechanism with the awareness of the bandwidth occupation rate is designed to compromise the data transmission and system control performance. Qualitative and quantitative analyses are conducted to illustrate that this design is capable of providing expected performance.