CN-122017672-A - Single diode open-circuit fault diagnosis and positioning method for aviation multi-pulse voltage transformation rectifier

CN122017672ACN 122017672 ACN122017672 ACN 122017672ACN-122017672-A

Abstract

The invention relates to a single diode open-circuit fault diagnosis and positioning method for an aviation multi-pulse voltage transformation rectifier, which can effectively solve the problem that the detection methods of the open-circuit faults of the single diodes in the early stages of rectifier bridges in different types of aviation multi-pulse voltage transformation rectifiers are not uniform. The method comprises the steps of obtaining direct current components in primary side/secondary side currents of a phase-shifting transformer by using a low-pass filter, defining primary side current direct current component residual errors, judging whether a single diode open circuit fault occurs in a rectifier bridge in an aviation multi-pulse transformer rectifier, if the single diode open circuit fault occurs, comparing absolute values of direct current components of any two primary side currents, obtaining the maximum value of the direct current components of the secondary side current to judge the rectifier bridge where the fault diode is located and the phase where the fault diode is located, further judging whether an upper bridge arm diode or a lower bridge arm diode is open circuit by calculating the difference between the absolute value of the maximum value and the absolute value of the minimum value of the secondary side current in one period, and finally realizing the functions of diagnosing and positioning the single diode open circuit fault of the rectifier bridge in the aviation multi-pulse transformer rectifier. The diagnosis and positioning method is strong in universality, simple and easy to implement, and can be used for acquiring direct current components of all currents only through a low-pass filter, so that early faults can be found, and safe operation of the aviation secondary power supply system can be maintained.

Inventors

WANG TING
LI WEILIN
ZHANG XIAOBIN
LI WEI
LI DA

Assignees

西北工业大学

Dates

Publication Date: 20260512
Application Date: 20260206

Claims (4)

1. A single diode open circuit fault diagnosis and positioning method for an aviation multi-pulse voltage transformation rectifier is characterized by comprising the following steps: Step 1, determining the transformation ratio N and the pulse number of an aviation multi-pulse transformer rectifier Fundamental frequency of input voltage Isoparametric parameters; Determining the connection mode of primary side/secondary side windings of phase-shifting transformer in aviation multi-pulse voltage-transformation rectifier, including star connection and triangle connection, and marking the star connection windings in turn Wherein Triangle-shaped linking winding mark ; Step 2: collecting three-phase current of primary side of phase-shifting transformer, and recording as Obtaining primary side three-phase current by using low-pass filter The DC component of (a) is recorded as ; Step 3, calculating the residual error of any two-phase direct current component, , , ; Step 4, according to , , Judging that a rectifier diode in the aviation multi-pulse transformer rectifier has an open circuit fault: If the residual error satisfies Each rectifier bridge in the multi-pulse transformer rectifier is in a healthy state, otherwise, the open circuit fault occurs in the rectifier diodes in the multi-pulse transformer rectifier, wherein, A preset value near zero; step 5, according to And , , Judging the position of a diode with open circuit fault in a rectifier bridge: If it meets And is also provided with The diode with open circuit fault is located in the rectifier bridge connected with the secondary winding of the phase-shifting transformer; If it meets And is also provided with The diode that failed in the open circuit is located in the rectifier bridge connected to the secondary winding of the delta-connection of the phase-shifting transformer.
2. The method for diagnosing and locating an open circuit fault of a single diode of an airborne multi-pulse transformer rectifier of claim 1, further comprising: step 6, judging the position of the phase of the diode with open circuit fault in the rectifier bridge: If the open circuit diode is positioned in the rectifier bridge connected with the secondary winding of the phase-shifting transformer, the corresponding phase-shifting transformer is collected Three-phase input current of each rectifier bridge Low pass filtering to obtain Is a direct current component sequence of (2) Wherein the maximum value of the absolute value of the DC component The phase of the bridge is the position of the diode with open circuit fault; If the open-circuit diode is positioned in the rectifier bridge connected with the secondary winding of the delta-shaped connection of the phase-shifting transformer, the corresponding acquisition is performed Three-phase input current of each rectifier bridge Low pass filtering to obtain Is a direct current component sequence of (2) Wherein the maximum value of the absolute value of the DC component The phase of the bridge is the position of the diode with open circuit fault; Step7, at a certain time k, obtaining the current of the phase where the fault diode is located Or (b) The difference between the absolute value of the maximum value and the absolute value of the minimum value in one period, Or (b) ; Step 8, judging whether the diode with the open circuit fault is positioned on an upper bridge arm or a lower bridge arm of the rectifier bridge: If it meets Or (b) The diode with open circuit fault is positioned at the lower bridge arm of the rectifier bridge, If it meets Or (b) The open-circuit fault diode is located in the upper leg of the rectifier bridge, wherein, Is a preset value near zero.
3. The method for diagnosing and locating an open circuit fault of a single diode of an aircraft multi-pulse transformer rectifier according to claim 1, wherein in step 4, the method comprises the steps of The value range is 1% -5% of the primary side input current of the phase-shifting transformer.
4. The method for diagnosing and locating an open circuit fault of a single diode of an aircraft multi-pulse transformer rectifier according to claim 1, wherein in step 8, said method comprises the steps of The value range is 1% -5% of the amplitude of the secondary side output current of the phase-shifting transformer.

Description

Single diode open-circuit fault diagnosis and positioning method for aviation multi-pulse voltage transformation rectifier Technical Field The invention belongs to the technical field of fault diagnosis of aviation secondary power supply systems, and particularly relates to a method for diagnosing and positioning a single diode open circuit fault of a rectifier bridge in an aviation multi-pulse transformer rectifier. Background More than 30% of modern aircraft on-board equipment relies on a direct current power supply, and a multi-pulse transformer rectifier is a typical component for realizing the alternating current to direct current of an aircraft, generally comprises 12 pulses, 18 pulses or 24 pulses, and adopts phase-shifting transformers with different connection methods to counteract specific harmonic waves at the side of an alternating current network so as to reduce direct current output voltage ripple. Typical multi-pulse transformer rectifiers are connected in parallel or in series as shown in FIG. 1, usingThe parallel or series structure of the three-phase uncontrollable rectifier bridge realizes the split or partial pressure of the load. Under the influence of strong vibration, high stress, wide temperature and the like in an aviation environment, a rectifier bridge in the multi-pulse transformer rectifier is easy to generate single diode open circuit or short circuit faults, and accounts for more than 60% of all fault types. Wherein, the short circuit fault can cause overcurrent which is tens times or even hundreds times of normal current, and is easy to be detected and isolated. The multi-pulse transformer rectifier can still work in a short time after an open circuit fault, the voltage/current change is not obvious, especially the fault characteristic is covered up when in light load, and the early stage of the fault is difficult to discover in time. In this case the remaining diodes will be subjected to greater electrical stresses, exacerbating the risk of failure and even leading to failure at the system level. Therefore, the early diagnosis of the open circuit of the diode in the aviation transformer rectifier, namely the diagnosis of the open circuit fault of the single diode, has important practical significance for improving the reliability of the multi-pulse transformer rectifier, reducing the replacement cost of parts and the like. At present, the intelligent diagnosis of the open-circuit fault of the diode in the multi-pulse transformer rectifier is carried out by analyzing the time/frequency domain change of the output voltage before and after the fault, or by using an intelligent algorithm to carry out 'black box' analysis. The methods need a certain expert knowledge, and a large amount of historical fault data is needed while the methods are closely related to the working principle of the multi-pulse transformer rectifier, so that the universality is poor, and the engineering technical requirements on personnel are high. Therefore, the patent provides a universal aviation transformer rectifier single diode open circuit fault diagnosis method which has the advantages of strong universality, simple implementation, strong theoretical interpretability, wide application range and the like. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide a single diode open circuit fault diagnosis and positioning method for an aviation multi-pulse voltage transformation rectifier. In order to achieve the above purpose, the present invention adopts the following technical scheme: the invention provides a single diode open circuit fault diagnosis and positioning method of an aviation multi-pulse transformer rectifier, which comprises the following steps: step 1, determining the transformation ratio N and the pulse number of a multi-pulse transformer rectifier Fundamental frequency of input voltageIsoparametric parameters; Determining the connection mode of primary side/secondary side windings of phase-shifting transformer in multi-pulse voltage-varying rectifier, including star-type connection and triangular connection, and marking the windings of star-type connection in turn WhereinTriangle-shaped linking winding mark。 Step 2: collecting three-phase current of primary side of phase-shifting transformer, and recording asObtaining primary side three-phase current by using low-pass filterThe DC component of (a) is recorded as。 Step 3, calculating the residual error of any two-phase direct current component, ; ; 。 Step 4, according to,,Judging that a rectifier diode in the multi-pulse transformer rectifier has open circuit faults: If the residual error satisfies And if not, the rectifier diodes are in open circuit fault. Wherein, the Is a preset value near zero. Step 5, according toAnd,,Judging the position of a diode with open circuit fault in a rectifier bridge: If it meets And is also provided withThe fault diode with open circuit is positioned in