Open-circuit fault diagnosis of power tubes in power converter of dual three-phase starter-generator system
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摘要:
为解决航空双三相永磁辅助式同步磁阻起动发电系统电源变换器的功率管开路故障诊断问题，提出了基于
z 1-z 2坐标系电流和直流母线电压的功率管单相开路故障诊断与定位方法。采用空间矢量解耦方法建立电机本体和电源变换器模型；基于该模型分析电源变换器单相单管和单相双管开路故障特性及其在z 1-z 2坐标系电流轨迹和直流母线电压上反映出的故障特征；提出基于z 1-z 2坐标系电流和直流母线电压的单相单管及单相双管开路故障诊断与定位方法，检测故障发生，确定故障位置。通过实验平台验证所提方法的有效性，结果表明：所提方法可对电源变换器单相开路故障进行诊断与定位，进而为故障发生后的容错运行提供指导。Abstract:The aerospace dual three-phase permanent magnet assisted synchronous reluctance starter-generator system’s power converter had an open-circuit fault diagnosis issue. To address this, a single-phase open-circuit fault diagnosis and localization method for power tubes based on the bus voltage and
z 1-z 2 coordinate system current was proposed. Firstly, the starter-generator and power converter model were established by using the vector space decomposition method. Next, using this model, the single-phase double-tube open-circuit and single-phase single-tube open-circuit fault characteristics represented in the power converter’s DC bus voltage andz 1-z 2 coordinate system current trajectory were examined. A single-phase single-tube open circuit and single-phase double-tube open circuit fault diagnosis and location method based onz 1-z 2 coordinate system current and DC bus voltage was proposed to detect the occurrence of faults and determine the fault location. The experimental platform ultimately confirmed the method’s efficacy. The experimental findings show that the technique is capable of identifying and diagnosing power converter single-phase power tube open-circuit failures. This in turn provides important guidance for fault-tolerant operation after the fault occurs.-
Key words:
- fault diagnosis /
- power tube open circuit /
- starter-generator /
- power converter /
- harmonic current
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图 4 正常和上、下功率管开路故障情况下的桥臂电流路径
Figure 4. Bridge arm current path under normal conditions and open-circuit fault of upper and lower power transistors
图 5 不同单相单管开路故障下的z1-z2坐标系直流母线电压轨迹
Figure 5. DC bus voltage trajectory of z1-z2 coordinate system under different single-phase single-tube open-circuit faults
图 6 单相单管开路故障下绕组输出功率变化量各次谐波幅值比
Figure 6. Amplitude ratio of each harmonic component of change in winding output power under single-phase single-tube open circuit fault
图 7 各相双管开路故障下的z1-z2坐标系电流轨迹
Figure 7. Current trajectory in z1-z2 coordinate system under open-circuit faults in each phase double-tube
图 8 5、7次谐波电流对应的z1-z2坐标系电流轨迹
Figure 8. Current trajectories in the z1-z2 coordinate system corresponding to the 5th and 7th harmonic currents
图 12 滤波前的单相双管开路故障下${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $电流轨迹
Figure 12. Current trajectories of ${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $ under single-phase double-tube open circuit fault before filtering
图 13 滤波后的单相双管开路故障下${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $电流轨迹
Figure 13. Current trace of ${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $ under single-phase double-tube open circuit fault after filtering
图 14 单相单管开路故障情况下${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $与${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2\_ {\mathrm{F}}}} $电流轨迹
Figure 14. Current trajectory of ${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2}} $ and ${{\boldsymbol{i}}_{{\textit{z}}_1{\textit{z}}_2\_ {\mathrm{F}}}} $ under single-phase single-tube open circuit fault
图 15 单相双管与单相单管开路故障下的直流母线电压
Figure 15. DC bus voltage under single-phase double-tube and single-phase single-tube open circuit fault
图 16 单相双管与单相单管开路故障下的故障相电流波形
Figure 16. Fault phase current waveforms under single-phase double-tube and single-phase single-tube open-circuit faults
图 17 A相双管开路故障情况下各相缺相故障指示值
Figure 17. Phase loss fault indication values of each phase in case of double-tube open circuit fault in phase A
图 18 A相上桥臂功率管开路故障情况下各功率管开路故障指示值
Figure 18. Open circuit fault indication values of each power tube when upper bridge arm power tube of phase A has an open circuit fault
表 1 单相双管开路故障定位
Table 1. Single-phase double-tube open circuit fault location
最大值 单相双管开路故障位置 $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}}}} \right|} $ A $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}\_{{30}^ \circ }}}} \right|} $ E $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}\_{{60}^ \circ }}}} \right|} $ B $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}\_{{90}^ \circ }}}} \right|} $ F $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}\_{{120}^ \circ }}}} \right|} $ C $ \displaystyle\sum {\left| {{i_{{\textit{z}}_1\_{\rm F}\_{{150}^ \circ }}}} \right|} $ D 
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表 2 单相单管开路故障定位
Table 2. Single-phase single-tube open circuit fault location
最大值 单管开路故障位置 $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}}}} $ AL $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{30}^ \circ }}}} $ EL $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{60}^ \circ }}}} $ BU $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{90}^ \circ }}}} $ FU $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{120}^ \circ }}}} $ CL $ \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{150}^ \circ }}}} $ DL $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}}}} $ AU $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{30}^ \circ }}}} $ EU $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{60}^ \circ }}}} $ BL $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{90}^ \circ }}}} $ FL $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{120}^ \circ }}}} $ CU $ - \displaystyle\sum {{i_{{\textit{z}}_1\_{\rm F}\_{{150}^ \circ }}}} $ DU
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