Four-Switch Three-Phase Operation of Grid-Side Converter of Doubly Fed Induction Generator With Three Vectors Predictive Direct Power Control Strategy

Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode

“…It can be seen from Figure 5 that both the switching sequences adopt V 1 and V 3 , the difference is that the switching sequence I adopts V 2 while the switching sequence II adopts V 4 . The optimized switching sequence can be selected according to (20) where a new evaluation criteria (g 1 ) is defined in (21). If S is I, the switching sequence I is selected; otherwise, the switching sequence II is selected:…”

“…According to the part A of this section, the control objectives of tracking of T * e and Ψ * s under the MTPA control can be transferred to the tracking of Ψ * d and Ψ * q . Thus, the optimized switching sequence selecting method in (20) can ensure the optimization of the electromagnetic torque and stator flux.…”

“…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]. The above three control strategies all face the same problems, namely torque ripple suppression and capacitor voltage balance.…”

“…An improved MPC for 3P4SIs connected to surface permanent magnet synchronous generators by increasing the adopted space vectors is studied in [19] to minimize the current reference tracking error. A 3P4SI operation of the grid-side converter of the doubly fed induction generator with the three-vector MPC strategy is studied in [20], where three space vectors are adopted to decrease the ripples of the control variables and make the switching frequency fixed. However, the methods in [19,20] are complicated to implement and the corresponding control strategy for IPMSMs has not been studied.…”

“…A 3P4SI operation of the grid-side converter of the doubly fed induction generator with the three-vector MPC strategy is studied in [20], where three space vectors are adopted to decrease the ripples of the control variables and make the switching frequency fixed. However, the methods in [19,20] are complicated to implement and the corresponding control strategy for IPMSMs has not been studied. 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.…”