Design and Control Methods of Bidirectional DC-DC Converter for the Optimal DC-Link Voltage of PMSM Drive

Abstract

-This paper shows the design and control methods of the bidirectional DC-DC converter to generate the proper DC-link voltage of a PMSM drive. Conventionally, because the controllable power of the PWM based voltage source inverter is limited by its DC-link voltage, the DC-DC converter is used for boosted DC-link voltage if the inverter source cannot generate enough operating voltage for the PMSM drive. In this paper, to obtain more utilization of this DC-DC converter, optimal DC-link voltage control for PMSM drive will be explained. First, the process and current path of the DC-DC converter will be illustrated, and a control method of this converter for variable DC-link voltage will then be explained. Finally, an improvement analysis of the optimal DC-link voltage control method, especially on the deadtime effect, will be explained. The DC-DC converter of the proposed control method is verified by the experiments by comparing with the conventional constant voltage control method.

Regenerative Battery Charging Control Method for PMSM Drive without a DC/DC Converter

“…Note that if battery voltage is increased, the controlled regenerative torque also rises, because the power required for constant battery current control also increases, similar to as shown in Figure 12. Table 3 shows a comparison between the previous control method by [14] and the proposed one. The charging method using the old charging controller has 89% maximum efficiency; however, with the proposed charging method, maximum efficiency was found to be 92%.…”

“…The drive topology of a PMSM is shown in Figure 1a; however, for DC-link voltage stabilization or to charge the battery, a bidirectional DC-DC converter is placed between the battery and the motor drive [7]. The bidirectional DC-DC converter in Figure 1b controls power flow by using a battery management system (BMS) [8][9][10][11][12][13][14][15][16]. Therefore, the PMSM drive configuration in Figure 1b offers more battery stability and efficiency, as compared to the arrangement in Figure 1a.…”

Predictive torque control of induction motor with integrated DC‐link voltage optimisation

“…Regardless of the used control strategy, torque, and current ripple reduction of IM or permanent magnet synchronous motors drive can be achieved by implementing DC‐link voltage optimisation [27–34]. Since IM represents an inductive load, it follows that lower DC‐link voltage will lead to the lower current, and, consequently, torque ripple.…”

“…However, this approach is possible only for control strategies utilising modulator. The authors of [29, 30, 32, 33] determine the optimal voltage from the measured or reference IM quantities and IM model parameters. The disadvantages are the open‐loop algorithm operation and the lack of robustness against parameter variation.…”

State-of-Charge Balancing Control of a Battery Power Module for a Modularized Battery for Electric Vehicle

“…EVs use battery packs as their sole energy source, and can operate without releasing pollutants. Thus, the motor for EVs needs to be supplied with energy from the battery while the EV is being driven, and the DC-link voltage should be regulated at a constant value [1]. Therefore, a DC-DC converter located between the battery and the inverter is required to transfer the charged energy of the battery to the motor and maintain a constant DC-link voltage.…”