**4.4 Comparison of BDS, IPC, and SCC methods**

When compared to earlier methods, called the BDS method and IPC method, no auxiliary hardware is required for SCC method for electrical braking in the matrix converter drive as shown in **Table 1**. The BDS method [18] has three drawbacks:

**63**

**Table 1.**

**Figure 11.**

*The standard clamp circuit method.*

*Comparison of BDS, IPC, and SCC.*

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

age in the input side or output side.

cal braking.

1.It requires three BDS in series with three resistors.

3.This auxiliary circuit increases size, weight, and cost.

Similarly, the IPC method has three main drawbacks:

3.This auxiliary circuit increases the size, weight, and cost.

2.Also, it requires complex control platform, which controls six PWM for electri-

1.It requires conventional uncontrolled diode rectifier and UDS with a resistor.

The SCC method requires only one UDS switch in series with a resistor. Because of using SCC in the MC drive, achieving electrical braking using this method is easy and no complicated control platform is required. The SCC is considered as a safety device to protect the matrix converter under abnormal conditions such as overvolt-

**Factors BDS method IPC method SCC method** Switches 3 (BDS) 1 (UDS) 1 (UDS) Resistors 3 1 1 Diodes 0 6 0 Weight, size, and cost Considerably increased Bit increased Remains same Implementation Complicated Not complicated Simple

2.Separate control platform for a PWM for electrical braking is required.

*Aerospace Engineering*

reference (IVR) technique.

*The input power clamp (IPC) method.*

**Figure 10.**

**4.3 Standard clamp circuit (SCC) method**

braking circuit for SCC is shown in **Figure 14**.

**4.4 Comparison of BDS, IPC, and SCC methods**

by MC drive is considered.

is located across the input filter capacitors (*CAB*, *CBC*, and *CAC*). The RCC of IPC is controlled using either power comparison (PC) technique or the input voltage

The main power electronic components for RCC of IPC are conventional uncontrolled six-pulse rectifier and a UDS in series with a braking resistor (R), as shown in **Figure 10**. This braking resistor does not have inductive property to help to achieve better electrical braking when regeneration happens in MC drive. It is believed that IPC method is the best method when compared to BDS method because it requires only fewer power semiconductor switching components but not suitable for aerospace applications because it has electrolytic capacitor in the RCC.

Similar to the BDS method and the IPC method [19], the proposed standard clamp circuit (SCC) method is using two techniques to detect the regeneration in the matrix converter drive. These are (1) power comparison (PC) technique and (2) input voltage reference technique. However, here the PC technique is only considered and the simulation results of the SCC method with PC technique are discussed. The block diagram for standard clamp circuit is shown in **Figure 11**. The electrical

Power dissipation through resistor is directly proportional to duty cycle of UDS, which is already given in Eq. (1). To prove the performance of the SCC method for electrical braking in the MC drive, a 2.2-kW vector-controlled induction motor fed

When compared to earlier methods, called the BDS method and IPC method, no auxiliary hardware is required for SCC method for electrical braking in the matrix converter drive as shown in **Table 1**. The BDS method [18] has three

**62**

drawbacks:


Similarly, the IPC method has three main drawbacks:


3.This auxiliary circuit increases the size, weight, and cost.

The SCC method requires only one UDS switch in series with a resistor. Because of using SCC in the MC drive, achieving electrical braking using this method is easy and no complicated control platform is required. The SCC is considered as a safety device to protect the matrix converter under abnormal conditions such as overvoltage in the input side or output side.

#### **Figure 11.**

*The standard clamp circuit method.*


#### **Table 1.**

*Comparison of BDS, IPC, and SCC.*
