PROGRAMMABLE PROCESS FOR DETECTING FAULTS IN CURRENT SENSORS OF A THREE-PHASED ELECTRONIC CONVERTER

• Main Author: RUBA MIRCEA
• Format: Patent
• Language: English; Romanian
• Published: 28.02.2020
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention relates to a process for detecting faults in the current sensors of a three-phased electronic converter. According to the invention, the process runs at a frequency 250 times higher than the frequency of the converter control loop and performs the stages of: fault detection by continuously monitoring the difference between the instantaneous values measured and the reference values of the currents on each phase, comparison between the previously mentioned difference and a threshold value, and, in case the difference exceeds the mentioned threshold value, the fault occurred is compensated by replacing the measured value with an estimated current value on the phase where the fault occurred, the values of the regulator coefficients in the control loop are changed and the mechanism for detecting faults on the phases remained operational is blocked for a set time period. Invenţia se referă la un procedeu de detecţie a defectelor senzorilor de curent ai unui convertor electronic trifazat. Procedeul conform invenţiei rulează la o frecvenţă de 250 de ori mai mare decât frecvenţa buclei de control a convertorului şi efectuează etapele de: detectare a unui defect prin monitorizarea continuă a diferenţei dintre valorile instantanee măsurate şi valorile de referinţă ale curenţilor pe fiecare fază, comparare a diferenţei menţionate anterior cu o valoare de prag, iar în cazul în care diferenţa depăşeşte valoarea de prag menţionată, se compensează defectul apărut prinînlocuirea valorii măsurate cu o valoare estimată a curentului pe faza pe care a apărut defectul, se modifică valorile coeficienţilor regulatoarelor din bucla de control şi se blochează mecanismul de detecţie a defectelor pe fazele rămase operaţionale, pentru o perioadă de timp stabilită.