公开(公告)号：US09054589B2

公开(公告)日：2015-06-09

申请号：US13650891

申请日：2012-10-12

Applicant: Rockwell Automation Technologies, Inc.

Inventor： Zhongyuan Cheng ,  Yuan Xiao ,  Ghodratollah Esmaeili Rineh ,  Manish Pande ,  Navid Zargari

IPC: H02H3/00 ,  H02M1/32 ,  H02M5/451 ,  H02M5/458 ,  H02M7/525 ,  H02M7/539 ,  G01R31/02 ,  G01R31/42

CPC classification number: H02M1/32 ,  G01R31/028 ,  G01R31/42 ,  H02M1/126 ,  H02M5/4505 ,  H02M5/451 ,  H02M5/458 ,  H02M5/4585 ,  H02M7/525 ,  H02M7/539

Abstract: Power converters and control techniques are presented in which capacitor degradation is detected according to negative sequence current by computing an uncompensated negative sequence current and a negative sequence voltage, compensating the negative sequence current based on the negative sequence voltage, comparing the compensated or uncompensated negative sequence current with an automatically calculated threshold and selectively identifying suspected degradation of one or more capacitors if the compensated negative sequence current exceeds the threshold value. The method can be used for power converters, control devices or protection relays for shunt capacitors or filters used in power systems.

Abstract translation: 提出了功率转换器和控制技术，其中通过计算未补偿的负序电流和负序电压根据负序电流检测电容器劣化，基于负序电压补偿负序电流，比较补偿或未补偿的负序 电流具有自动计算的阈值，并且如果补偿的负序电流超过阈值，则选择性地识别一个或多个电容器的可疑劣化。 该方法可用于电力系统中使用的电源转换器，控制装置或分流电容器或滤波器的保护继电器。