Abstract
A switching sequence model predictive direct torque control (MPDTC) of IPMSMs for EVs in switch open-circuit fault-tolerant mode is studied in this paper. Instead of selecting one space vector from the possible four space vectors, the proposed MPDTC method selects an optimized switching sequence from two well-designed switching sequences, including three space vectors, according to a new designed cost function of which the control objectives have been transferred to the dq-axes components of the stator flux-linkage under the maximum-torque-per-ampere control. The calculation method of the durations of the adopted space vectors in the optimized switching sequence is studied to realize the stator flux-linkage reference tracking. In addition, the capacitor voltage balance method, by injecting a dc offset to the current of fault phase, is given. Compared with the conventional MPDTC method, the complicated weighting factors designing process is avoided and the electromagnetic torque ripples can be greatly suppressed. The experimental results prove the effectiveness and advantages of the proposed scheme.
Highlights
The drive system of interior permanent magnet synchronous motors (IPMSMs) [1,2] based on two-level voltage source inverters (2L-VSIs) [3,4] has become one of the mainstream speed control schemes for electric vehicles (EVs) due to advantages, such as high efficiency, excellent speed regulation performance, and high power density
For the software reconfigurations in the case where 3P4SIs are adopted as the fault-tolerant topology, the existing studies can be divided into three aspects according to the control strategies, i.e., flux-oriented control (FOC) with pulse-width modulation (PWM) [12,13,14], direct torque control (DTC) [15,16], and model predictive control (MPC) [17,18,19,20,21,22]
IPMSM1 is connected with the and the proposed control strategy is implemented by the controller 3
Summary
The drive system of interior permanent magnet synchronous motors (IPMSMs) [1,2] based on two-level voltage source inverters (2L-VSIs) [3,4] has become one of the mainstream speed control schemes for electric vehicles (EVs) due to advantages, such as high efficiency, excellent speed regulation performance, and high power density. For the software reconfigurations in the case where 3P4SIs are adopted as the fault-tolerant topology, the existing studies can be divided into three aspects according to the control strategies, i.e., flux-oriented control (FOC) with pulse-width modulation (PWM) [12,13,14], direct torque control (DTC) [15,16], and model predictive control (MPC) [17,18,19,20,21,22]. To avoid the complicated weighting factor tuning work, a simplified model predictive flux control with capacitor voltage offset suppression for 3P4SIs is proposed in [21], and the stator flux-linkage is taken as the only control term in the cost function. A switching sequence model predictive direct torque control (MPDTC) of IPMSMs for EVs in switch open-circuit fault-tolerant mode is proposed.
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