国家自然科学基金(51977153,51977161,51577046)、国家重点研发计划(2020YFB0905905,2016YFF0102200)、中央高校基本科研 业务费专项资金(2042021kf0233)、国家自然科学基金重点项目(51637004)、装备预先研究重点项目(41402040301)、湖北省重点研发计划项目 (2021BEA162)、武汉市局科技计划项目(20201G01)资助
为了降低三电平中点钳位型(NPC)整流器故障诊断算法的复杂度和成本,本文提出基于开关状态的开关开路故障诊断 方法。 首先,选取某些开关状态在半个电流周期的累计值作为诊断变量,并结合自适应阈值及电流相位实现故障桥臂的检测。 其次,执行基于无功电流注入的外开关故障容错控制并对阈值进行更新。 最后,在容错期间基于诊断变量的变化情况,实现故 障开关的定位。 所提出的方法能够同时实现单和双开关开路故障诊断,而无需额外的传感器以及复杂的计算和诊断规则,具有 实现简单和成本低的优点。 实验结果验证了所提出方法的有效性和鲁棒性。
In order to reduce the diagnostic complexity and cost of the three-level neutral-point-clamped ( NPC) rectifier, a fault diagnosis method for the open-circuit fault of power switches was proposed. This method was based on the characteristics of switching states. Firstly, the cumulative values of some switching states in half a current cycle were selected as the diagnostic variables, which were combined with the self-adaptive threshold and the phase of currents to realize the faulty bridge arm detection. Then, the outerswitch fault-tolerant control based on reactive current injection was implemented and the threshold was updated. Finally, according to the change of diagnostic variables, the faulty switch was located during fault-tolerant process. The proposed method can realize both singleswitch and double-switch open-circuit fault diagnosis without additional sensors, complicated calculations and diagnostic rules. It has the advantages of simple implementation and low cost. The experimental results verify the effectiveness and robustness of the proposed method.
陈铭芸,何怡刚,赵莹莹.基于开关状态的三电平 NPC 整流器开路故障诊断[J].电子测量与仪器学报,2023,37(7):62-71复制