Sensor failure monitoring method and device

Abstract

The embodiment of the invention provides a sensor failure monitoring method and device. Through acquisition of the output current and capacitor voltage detection value of a STATCOM device, the outputcurrent is input to a prediction model, the capacitor voltage prediction value of a capacitor voltage sensor is obtained through calculation, and whether or not the capacitor voltage sensor breaks down is judged based on the residual error between the capacitor voltage detection value and the capacitor voltage prediction value; if yes, the feedback input value of each control strategy used for controlling the STATCOM device is switched to the capacitor voltage prediction value to control the STATCOM device to run. According to the technical scheme, through establishment of a sensor failure detection and judgment mechanism, after the sensor breaks down, output of the capacitor voltage prediction value is adopted for replacing the detection value of the capacitor voltage sensor and used as feedback input of a closed-loop system, soft closed-loop fault tolerant control is achieved, fault tolerant control can be achieved when the capacitor voltage sensor of the STATCOM device breaks down,the sensor failure monitoring method and device have good accuracy and real-time performance, and a safety accident caused by a sensor failure is effectively prevented.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a sensor fault monitoring method and device. Background technique [0002] In recent years, the Static Synchronous Compensator (STATCOM) based on the H-bridge structure has been widely used in the fields of reactive power compensation and harmonic control due to its advantages of modularization, easy installation, and convenient expansion. With the continuous investment of large-capacity STATCOM devices in the power grid, their reliability has become an important condition for the safe operation of the power grid. However, since the STATCOM system is a very complex nonlinear multi-closed-loop system, there are multiple detection links (eg, sensors) in the system for the feedback input of the closed-loop system. Due to the influence of the working environment of the STATCOM system, these sensors are prone to failure when they are exposed to high temperature and strong electroma...

AI Technical Summary

Problems solved by technology

Due to the influence of the working environment of the STATCOM system, these sensors are prone to failure when they are exposed to high temperature and strong electromagnetic interference for a long time

Once a fault occurs, if it is not dealt with in time, the feedback signal from the fault sensor will quickly spread in the closed-loop control system, which may cause an increase in system harmonics and equipment damage, or cause a safety accident and cause casualties

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