Fault tolerant inverter for local phase loss in multi-phase electrical machines

• Main Authors: KRISHNAMURTHY, SUDHIR, ARAFAT AKRAM, MURTHY BAYLOR DIPAK SUNDARESAN
• Format: Patent
• Language: Chinese; English
• Published: 31.01.2023
• 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 THEREOF; CONTROLLING; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; PHYSICS; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; TRANSPORTING; VEHICLES IN GENERAL

A method and system of operating a multi-phase electric machine includes operating an inverter to control the multi-phase electric machine. The inverter has a plurality of inverter branches including an auxiliary inverter branch. Each of the plurality of inverter branches has at least one switching device. The multi-phase electric machine has a plurality of phases, wherein each phase is controlled by a respective inverter branch of the inverter. The method and system also include determining whether a phase of the multi-phase electric machine is experiencing local phase loss, e.g., by injecting a signal into the phase and analyzing the frequency response. In response to determining that the phases of the multi-phase electric machine are experiencing the local phase loss, the methods and systems include utilizing an auxiliary inverter leg to replenish energy to the phases experiencing the local phase loss to continue operating the multi-phase electric machine. 一种操作多相电机的方法和系统包括操作逆变器以控制多相电机。逆变器具有多个包括辅助逆变器支路的逆变器支