Fault Tolerant Operation of Simplified Active NPC (ANPC) Inverters Using WECS
نویسندگان
چکیده
-Simplified active NPC (ANPC) inverters enable a substantially increased output power and an improved performance at zero speed for high-power electrical drives. This paper analyzes the operation of Simplified ANPC inverters under device failure conditions, and proposes the fault-tolerant strategies to enable continuous operating of the inverters and drive systems under single device openand short-failure conditions. Therefore, the reliability and robustness of the electrical drives are greatly improved. Moreover, the proposed solution adds no additional components to standardANPC inverters; thus, the cost for robust operation of drives is lower. Simulation results are provided for verification. Furthermore, a comprehensive comparison for the reliability function of ANPC and NPC inverters is presented. The results show that ANPC inverters have higher reliability than NPC inverters. Two inverters have similar reliability for device open failure, while ANPC inverters have higher reliability than NPC inverters for device short failure. Therefore the input voltage is renewable energy and is rectified to DC using rectifier circuit and stored in the Battery.
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