Abc Motor Drive Chapter 5 Report

CHAPTER 5
SIMULATED PERFORMANCE IN DIFFERENT MODES
The performance of the Cuk converter-fed BLDC motor drive is simulated in four modes. Supply voltage (vs ) and supply current (is ) are used for estimating the PQ of the system. The performance in each mode of operation is evaluated based on various performance parameters. Satisfactory operation of the BLDC motor are determined by the speed (N), electromagnetic torque (Te ), and the stator current (ia ) of the BLDC motor. Performance of the cuk converter is evaluated by the dc-link voltage (Vdc), inductor’s currents (iLi and iLo), intermediate capacitor’s voltage (VC1 ), switch voltage (Vsw ), and switch current (isw ).To determine the PQ at ac mains PQ indices such as PF, displacement power

Table 5.1 shows the performance of the proposed BLDC motor fed by a PFC Cuk converter operating in the CCM over a wide range of dc-link voltage control (i.e., speed control) with unity PF operation at ac mains . The peak voltage and current stresses of 560 V and 8.1 A are obtained under rated condition in this mode of the CCM.
5.2. Performance in the DICM (Li)
The circuit configuration and control of the PFC Cuk converter operating in the DICM of operation with input inductor (Li) operating in discontinuous conduction are shown in Fig. 4.2. The parameters selected for this converter to operate in DICM (Li) are as follows:
Input inductor Li = 100 μH, output inductor Lo = 4.3 mH, intermediate capacitor C1 = 0.66 μF, and dc-link capacitor Cd = 2200 μF.
The steady-state performance of the Cuk converter-fed BLDC motor drive operating in the DICM with input inductor operating in discontinuous conduction is shown in Fig. 9. The input inductor current iLi is discontinuous as shown in Fig. 5.2, while the output inductor current iLo and intermediate capacitor’s voltage VC1 remain continuous. TABLE 5.2. CUK CONVERTER OPERATING IN THE DICM (LI