**5.1 Regeneration**

The regeneration can be demonstrated at Vin = 240 V, q = 0.75, and fs = 10 kHz by applying step transient to reverse the speed at 1.2 s as shown in **Figure 12**. A step transient lasts upto 2.4s, no load speed reversal (from +188.5 rad/s to -188.5 rad/s), as shown in the **Figure 13** which also shows developed torque which is direclty proportional to torque producing current (isq) of IM during VC. The torque producing current (iq) of the induction motor reaches the maximum limit of 35 A during acceleration as shown in **Figure 13**. Here regenerative power depends upon large inertial load (j = 0.089 kg m2 ) of the induction motor, which is created coupling IM with the same rating of DC motor (4 kW). The output current waveforms of the matrix converter drive is depicted in **Figure 14(a)**, which also indicates during speed reversal, the fourquadrant operation, inherent property, of MC from motoring mode to regenerating mode is smoothly achieved. The control of dq-currents (id, iq) with no coupling effects is demonstrated. **Figure 14(b)** shows input phase currents (iA, iB, iC) of the matrix converter during the four-quadrant operation. The input regenerative powers (PA, PB, PC) to be dissipated using the regeneration control circuit (RCC) are shown

**Figure 12.** *Overview of the simulation diagram for obtaining regeneration in the MC vector-controlled induction motor.*

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**Figure 15.**

**Figure 13.**

**Figure 14.**

*Matrix Converter for More Electric Aircraft DOI: http://dx.doi.org/10.5772/intechopen.81056*

*Speed and torque of the vector-controlled IM in regeneration. Vin = 240 V, q = 0.75, and fs = 10 kHz.*

*(a) Output currents of the MC and (b) input phase currents of the MC.*

*(a) Input phase powers of the MC and (b) phase opposition at regeneration.*

*Aerospace Engineering*

**5. Simulations results**

software package [12].

**5.1 Regeneration**

(j = 0.089 kg m2

To predict and verify the performance of the proposed methods for avoiding regeneration in a matrix converter, a simulation study is carried out using SABER

The regeneration can be demonstrated at Vin = 240 V, q = 0.75, and fs = 10 kHz by applying step transient to reverse the speed at 1.2 s as shown in **Figure 12**. A step transient lasts upto 2.4s, no load speed reversal (from +188.5 rad/s to -188.5 rad/s), as shown in the **Figure 13** which also shows developed torque which is direclty proportional to torque producing current (isq) of IM during VC. The torque producing current (iq) of the induction motor reaches the maximum limit of 35 A during acceleration as shown in **Figure 13**. Here regenerative power depends upon large inertial load

rating of DC motor (4 kW). The output current waveforms of the matrix converter drive is depicted in **Figure 14(a)**, which also indicates during speed reversal, the fourquadrant operation, inherent property, of MC from motoring mode to regenerating mode is smoothly achieved. The control of dq-currents (id, iq) with no coupling effects is demonstrated. **Figure 14(b)** shows input phase currents (iA, iB, iC) of the matrix converter during the four-quadrant operation. The input regenerative powers (PA, PB, PC) to be dissipated using the regeneration control circuit (RCC) are shown

*Overview of the simulation diagram for obtaining regeneration in the MC vector-controlled induction motor.*

) of the induction motor, which is created coupling IM with the same

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**Figure 12.**

**Figure 13.** *Speed and torque of the vector-controlled IM in regeneration. Vin = 240 V, q = 0.75, and fs = 10 kHz.*

**Figure 14.** *(a) Output currents of the MC and (b) input phase currents of the MC.*

in **Figure 15(a)**. During regeneration, the phase opposition (180*°* phase displacement) between the input phase voltages (VA, VB, VC) and input phase currents (iA, iB, iC) can be seen in **Figure 15(b)**.
