Electric-heating DCS control system, and fault diagnosis method and fault tolerance method of system

Abstract

The invention belongs to the technical field of building heat supply, and provides an electric heating control system, a fault detection method and a fault tolerance control method. Step response-based internal models of all rooms are acquired based on the prediction control thought or through an on-line or off-line method; then a prediction model is established; the difference between an output variation and an actual output variation of the prediction model is calculated and is compared with a threshold value to determine the working state of the system; then, the fault type is determined based on comprehensive analysis on other fault information; and finally, different control strategies are adopted according to the fault type, wherein a management layer open-loop prediction control method is adopted if a channel fault is detected, a field control layer closed-loop prediction control method is adopted when a communication channel fault is detected, and an environment temperature optimization-based control method is adopted when an actuator and execution channel fault is detected, so that fault diagnosis and fault tolerance control are achieved, and the heating reliability and economical efficiency are improved through software without adding any hardware resources.

Description

technical field [0001] The invention belongs to the technical field of building heating and provides an electric heating DCS control system, a system fault diagnosis method and a fault tolerance method. Background technique [0002] In the existing electric heating control system, the on-site controller usually adopts temperature-based PID closed-loop feedback control, so when the temperature sensor or its detection channel fails, the control output is either saturated or cut off, which will cause the electric heater to only It can be in the on or off state, so that the room temperature is in two extreme states of high or low, and it cannot track the given value so that the heating requirement cannot be effectively guaranteed. Furthermore, when the electric heater or the execution channel breaks down, the temperature control requirements of the room cannot be fulfilled obviously. In addition, when the communication channel between the management layer, the control layer and...

AI Technical Summary

Problems solved by technology

[0002] In the existing electric heating control system, the on-site controller usually adopts temperature-based PID closed-loop feedback control, so when the temperature sensor or its detection channel fails, the control output is either saturated or cut off, which will cause the electric heater to only It can be in the on or off state, so that the room temperature is in two extreme states of high or low, and it cannot track the given value so that the heating requirement cannot be effectively guaranteed

Furthermore, when the electric heater or the execution channel fails, the temperature control requirements of the room cannot be fulfilled obviously.

In addition, when the communication channel between the management layer, the control layer and the field control layer fails, the entire DCS control system is also in a paralyzed state

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