Abstract

This paper presents a model-based distributed fault-tolerant control (FTC) scheme with emphasis on compensating the effects of sensor faults in multi-zone heating, ventilating and air-conditioning (HVAC) systems. A bank of local adaptive FTC agents are designed to accommodate possible sensor faults in HVAC systems, modeled as a set of interconnected, nonlinear subsystems. In order to compensate the fault effects that may propagate in the neighboring subsystems, each local FTC utilizes the information generated by a local monitoring agent that diagnoses the sensor faults and performs an adaptive estimation of the isolated sensor faults. The local monitoring and control agents are allowed to exchange information with neighboring agents. Simulation results are used to illustrate the effectiveness of the proposed methodology applied to a seven-zone HVAC system.

Highlights

  • In recent years, there has been significant technological activity in the development of smart buildings, which have emerged based on the need to monitor and control the indoor living conditions and safety of the occupants, as well as the energy consumption of large-scale buildings

  • The HVAC components may be impacted by faults, which constitute a key reason for increases in energy consumption due to performance degradation of the system, while they may lead to uncomfortable conditions for the occupants

  • Taking into account the interconnected characteristics of HVAC systems, the early diagnosis and accommodation of faults is critical, since local fault effects may propagate from a local subsystem to neighboring subsystems either through the physical interconnections or through the distributed control scheme

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Summary

Introduction

There has been significant technological activity in the development of smart buildings, which have emerged based on the need to monitor and control the indoor living conditions and safety of the occupants, as well as the energy consumption of large-scale buildings. Taking into account the interconnected characteristics of HVAC systems, the early diagnosis and accommodation of faults is critical, since local fault effects may propagate from a local subsystem to neighboring subsystems either through the physical interconnections or through the distributed control scheme. To tackle this problem, the implementation of a fault tolerant control (FTC) scheme [1] is required.

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