Distributed Finite-Time Fault-Tolerant Control of Isolated AC Microgrids Considering Input Constraints

Abstract

This paper presents a distributed fault-tolerant finite-time control scheme for the secondary voltage and frequency restoration of islanded inverter-based Alternating Current (AC) Microgrids (MGs) considering input saturation and faults. Most existing distributed methods commonly design the secondary control layer based on ideal conditions of the control input channels of the MG without any faults and disturbances. At the same time, MGs are exposed to actuator faults that can significantly impact the control of MGs, and lead the MG in unstable situations. One of the other typical practical constraints in multi-agent systems such as MGs is saturation. The other novel idea is that a consensus-based scheme synchronizes the islanded MG's voltage and frequency to their nominal values for all DGs within finite time, irrespective of saturation and multiple faults, including partial loss of effectiveness and stuck faults simultaneously. Finally, the performance of the proposed control schemes are verified by performing an offline digital timedomain simulation on a test MG system through a couple of scenarios in MATLAB/Simulink environment. The effectiveness and accuracy of the proposed control schemes for islanded AC MGs are compared to previous studies, illustrating the privilege of that.

Enhanced Resilient Model Predictive Control Electrolyzers for Frequency Regulations Under Severe Denial-of- Service Attacks

“…EL stack I can be adjusted to control the downstream hydrogen generation rate and power consumption, as shown in equations ( 10) and (11). The aim of hydrogen production control is to maintain a regulated downstream rate of hydrogen generation.…”

“…False data injection attacks can damage the data integrity of the grid, whereas denial-of-service attacks can jeopardize communication network resources and services that are accessible to the power grid [10]. Several techniques such as fallback control [10], robust even-triggered control [11], [12], and resilience control [13], [14] have been proposed to reduce the impact of denial-of-service attacks on power system frequency regulation. Among these techniques, resilient control is an effective method for solving cyberphysical system issues.…”

Improved Resilient Model Predictive Control for Enhanced Microgrid Virtual Inertia Emulation by Virtual Energy Storage System Under DoS Attacks

“…Owing to their heavy reliance on communication networks, microgrids are susceptible to cyberattacks. Cyberattacks such as denial of service (DoS) and false data injection (FDI) attacks have been studied for the distributed control of microgrids [10], [11]. By accessing and altering the exchange of information, FDI attacks may compromise the microgrid's data integrity [10].…”

“…By accessing and altering the exchange of information, FDI attacks may compromise the microgrid's data integrity [10]. DoS attacks interrupt communication services, which hampers system functioning [10], [11].…”

“…Various methods have been proposed to enhance the distributed control of microgrids subjected to cyberattacks, including fallback control [12], resilient even-triggered control [11], [13], and resilient control [10], [14], [15], [16], [17]. Shi et al [10] investigated observer-based resilient frequency controls against cyberattacks that occur in sensors and actuators.…”