摘要
以四相8/6结构的开关磁阻电机功率变换器为研究对象,研究不对称半桥(AHB)式功率变换器的故障问题。分析功率变换器不同开关状态的工作模态,计算单开关管开路和短路故障时的相电流和平均转矩,并对比故障特征;通过改变功率变换器电流传感器的安装位置,提出一种仅需检测单相励磁区间内励磁和续流总线电流的故障诊断策略。该策略可以诊断出功率变换器单相开关管的短路和开路故障,并且能够定位出桥臂上短路和开路故障器件的位置。该方法仅需利用一相桥臂的励磁区间就可以实现故障诊断和故障定位,易于实现,且具有诊断逻辑简单、运算量小、快速性好、准确度较高的优点。仿真和实验结果验证了本文提出的故障诊断方法的有效性。
Power converter of a four-phase 8/6 switched reluctance motor system was taken for study and the fault issues of the asymmetrical half-bridge(AHB) power converter was investigated. By analyzing the switching states and operation modes of AHB power converter, the phase current and average torque of phase switches were calculated and the fault characteristics were comparatively analyzed;By changing the installation position of the current sensors, a fault diagnosis strategy was proposed, which only required detecting the excitation and freewheeling bus current of each phase during excitation operation. The single-phase short circuit and open circuit fault of the power converter can be diagnosed by the proposed strategy, and the short circuit and open circuit fault device can be located. Only one phase excitation interval is needed by the proposed method, which possesses advantages of ease installation, simple diagnosis logic, low computation burden and fast speed and high accuracy. Finally, effectiveness of the proposed strategy were verified by simulation and experiment results.
作者
袁响宏
于凯
于东升
李春泽
程鹤
YUAN Xiang-hong;YU Kai;YU Dong-sheng;LI Chun-ze;CHENG He(School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221000,China;Anhui Huadian Lu’an Power Generation Co.,Ltd.,Lu’an 237000,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2022年第9期57-68,76,共13页
Electric Machines and Control
基金
国家自然科学基金(51977208)。
关键词
功率变换器
开关磁阻电机
故障诊断
数字化
开路故障
短路故障
power converter
switched reluctance motor
fault diagnosis
digitalization
open circuit
short circuit