Abstract
This study proposes a generic mathematical modelling and decoupling fault-tolerant vector control for dual three-phase permanent magnet synchronous machine (PMSM) with one phase open based on the conventional dual three-phase voltage source inverters, accounting for the mutual coupling between two sets of three-phase windings and the second harmonic inductance. When the dual three-phase PMSM has one phase open, the permanent flux-linkages are asymmetric and there are second harmonic components in the conventional synchronous reference frame (dq-frame). Based on the proposed mathematical modelling, both permanent magnet flux-linkages and currents become DC values in the dq-frame, and therefore, the conventional proportional integral (PI) controller can be used to regulate the dq-axis currents. Then, a decoupling fault-tolerant vector control with/without a dedicated feed-forward compensation is proposed to validate the correctness of the proposed mathematical modelling. Experimental results on a prototype dual three-phase PMSM with one phase open show that the second harmonic dq-axis currents can be well suppressed simply by the conventional PI controller and dedicated feed-forward compensation. It also shows that the decoupling fault-tolerant control based on the proposed modelling and control method has excellent dynamic performance, which is equivalent to the vector space decomposition control for the healthy machine.
Highlights
Reliability has always been a major concern in many electrical drive applications such as automotive, aircraft, wind power and transportation [1,2,3,4,5]
A fault‐tolerant control is proposed for DT‐permanent magnet synchronous machine (PMSM) drives with different phase shift angles between the two sets of three‐ phase windings under open‐phase faults [25], where the torque capability and power loss are compared among four operation modes, that is, normal model, single three‐phase mode, minimum copper loss control, and maximum torque control
A generic and precise mathematical modelling and decoupling vector control for dual three‐phase PMSM (DT‐PMSM) with one phase open is proposed based on Figure 1, accounting for the mutual coupling between two sets of three‐ phase windings and the second harmonic inductance in the self‐inductance and mutual inductances between phases
Summary
Reliability has always been a major concern in many electrical drive applications such as automotive, aircraft, wind power and transportation [1,2,3,4,5]. A fault‐tolerant control is proposed for DT‐PMSM drives with different phase shift angles between the two sets of three‐ phase windings under open‐phase faults [25], where the torque capability and power loss are compared among four operation modes, that is, normal model, single three‐phase mode, minimum copper loss control, and maximum torque control. A generic and precise mathematical modelling and decoupling vector control for DT‐PMSM (asymmetrical, shift angle 30°) with one phase open is proposed based on Figure 1, accounting for the mutual coupling between two sets of three‐ phase windings and the second harmonic inductance in the self‐inductance and mutual inductances between phases. 1⁄2ψs 1⁄4 1⁄2Ls 1⁄2is þ ψf ð4Þ where [Rs], [vs], [is], [ψs] and [ψf] correspond to stator resistance, voltage, current, stator flux‐linkage and PM flux‐linkage with one phase open in abc‐xyz frame, respectively. [Ls] is the inductance matrix [27] for dual three‐phase PM machine with phase Z open, which can be expressed as Equation (5)
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