DC/DC Buck Power Converter as a Smooth Starter for a DC Motor Based on a Hierarchical Control

Abstract

In this paper a smooth starter, based on a dc/dc Buck power converter, for the angular velocity trajectory tracking task of a dc permanent magnet motor is presented. To this end, a hierarchical controller is designed, which is integrated by a control associated with the dc motor based on differential flatness at the high level, and a control related with the dc/dc Buck converter based on a cascade control scheme at the low level. The control at the high level allows the dc motor angular velocity to track a desired trajectory and also provides the desired voltage profile that must be tracked by the output voltage of the dc/dc Buck power converter. In order to assure the latter, a cascade control at the low level is designed, considering a sliding mode control for the inner current loop and a proportional-integral control for the outer voltage loop. The hierarchical controller is tested through experiments using MATLAB-Simulink and the DS1104 board from dSPACE. The obtained results show that the desired angular velocity trajectory is well tracked under abrupt variations in the system parameters and that the controller is robust in such operation conditions, confirming the validity of the proposed controller.Index Terms-Cascade control, dc/dc Buck power converter, dc motor, differential flatness, hierarchical controller, proportionalintegral (PI) control, sliding mode control (SMC), smooth starter, trajectory tracking. I. INTRODUCTIOND C motors are widely used in systems with high control requirements. Thus, rolling mills, double-hulled tankers, and high-precision digital tools can be mentioned as examples of such systems. Generally, to control the stepless velocity and smoothness, adjustment of the armature voltage of the motor is used [1]; while, certainly, applying pulse width modulation Manuscript

Bidirectional Tracking Robust Controls for a DC/DC Buck Converter‐DC Motor System

“…This system, in general, is composed of three stages, namely, a DC/DC Buck converter, a complete bridge inverter, and a DC motor. Unlike the arrangements presented in [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], such configuration allows the bidirectional driving of the motor shaft. The system average model presented in Figure 1, which was deduced and experimentally validated in [35], is given by…”

“…While Bingöl and Paçaci [15] reported a virtual laboratory based on neural networks to control angular velocity of such system. Recent works dealing with the angular velocity trajectory tracking for the DC/DC Buck converter-DC motor system have been reported in [16][17][18][19][20][21]. Sira-Ramírez and Oliver-Salazar [16] proposed a robust control based on the active disturbance rejection and differential flatness for two configurations of the DC/DC Buck converter-DC motor system.…”

“…Sira-Ramírez and Oliver-Salazar [16] proposed a robust control based on the active disturbance rejection and differential flatness for two configurations of the DC/DC Buck converter-DC motor system. SilvaOrtigoza et al introduced robust hierarchical controls based on differential flatness [17,18] and sliding mode-PI with flatness in [19]. Likewise, Hernández-Guzmán et al [20] proposed a sliding mode control and PI for controlling the converter voltage, the armature current, and the angular velocity of the motor.…”

Control of DC–DC Converter and DC Motor Dynamics Using Differential Flatness Theory

“…Indicative values for the parameters of the electric circuit formed by the DC-DC converter and the DC motor, that is shown in Fig. 2 are as follows [13]: E = 56 V, R = 61.7 , L = 118.6 mH, C = 114.4 µF, R a = 0.965 and L a = 2.22 mH while the moment of inertia of the rotor is J = 118.2 × 10 −3 kg m 2 .…”

“…Nonlinear control approaches for DC-DC converters connected to DC motors have been presented in [4][5][6][7][8]. In particular global linearization approaches and flatness-based control of such systems have been presented in [9][10][11][12][13][14][15]. In this article, a statespace description is obtained first for the system consisting of the DC-DC converter and the DC motor.…”