A Computationally Simple Predictive CCM Average Current Controller With Nearly Zero Tracking Error for Boost PFC Converter

2020 ◽  
Vol 56 (5) ◽  
pp. 5083-5094
Author(s):  
Harish Sudhakaran Nair ◽  
N. Lakshminarasamma
Keyword(s):  
Tracking Error ◽  
Current Controller ◽  
Average Current ◽  
Boost Pfc Converter

Improving Contour Accuracy of Machine Tools Using an Integral-Gain Scheduler

2005 ◽  
Vol 219 (7) ◽  
pp. 511-518 ◽  
Author(s):  
R C Ko ◽  
M C Good
Keyword(s):  
Machine Tools ◽  
High Performance ◽  
Pulse Width Modulation ◽  
Tracking Error ◽  
Contour Error ◽  
Current Loop ◽  
Pwm Inverter ◽  
Current Controller ◽  
Reversal Error ◽  
Grinding Machine

In high-precision machine tools, contour error at axis reversal can significantly reduce the quality of products. Resulting from non-linear friction behaviour, the reversal error is traditionally handled by the velocity controller, which highly relies on a high-performance current servo. However, the widely employed pulse width modulation (PWM) inverter in the power stage of the current servo operates with a severe non-linearity known as deadband. The deadband effect degrades the current-loop tracking performance and consequently hinders the velocity controller in responding to friction disturbances. The result is a significant and oscillatory tracking error, or contour error in a multiaxis system. Unlike other approaches where the deadband is compensated via measurement or estimation, a control system approach is proposed in this paper where the deadband is treated as a voltage perturbation in the current loop. The proposed scheme incorporates a feedforward signal from the current command and schedules the integral action in the current controller accordingly. The proposed scheme was implemented in digital servo drives of a commercial grinding machine. Experiments show that the proposed scheme is an effective and practical solution for this type of problem.

Deterministic robust control design for an iron core linear drive including second-order electrical dynamics

2018 ◽  
Vol 232 (8) ◽  
pp. 951-962 ◽  
Author(s):  
Fernando Villegas ◽  
Rogelio Hecker ◽  
Miguel Peña
Keyword(s):  
Robust Control ◽  
Tracking Error ◽  
Second Order ◽  
Iron Core ◽  
State Variables ◽  
State Transformation ◽  
Robust Controller ◽  
Current Controller ◽  
Bounded State ◽  
Robust Control Design

This work proposes a deterministic robust controller to improve tracking performance for a linear motor, taking into account the electrical dynamics imposed by a commercial current controller. The design is split in two parts by means of the backstepping technique, in which the first part corresponds to a typical deterministic robust controller, neglecting the electrical dynamics. In the second part, a second-order electrical dynamics is considered using a particular state transformation. There, the proposed control law is composed of a term to compensate the known part of the model and a robust control term to impose a bound on the effect of uncertainties on tracking error. Stability and boundedness results for the complete controller are given. To this effect, a general result on boundedness and stability of nonlinear systems with conditionally bounded state variables is derived first. Finally, experimental results for the complete controller show an improvement on tracking error of up to 31.7% when compared with the results from the typical controller that neglects the electrical dynamics.

scholarly journals Robust Current Predictive Control-Based Equivalent Input Disturbance Approach for PMSM Drive

Electronics ◽  
2019 ◽  
Vol 8 (9) ◽  
pp. 1034 ◽  
Author(s):  
Xudong Liu ◽  
Qi Zhang
Keyword(s):  
Predictive Control ◽  
Permanent Magnet Synchronous Motor ◽  
Tracking Error ◽  
Current Control ◽  
Control Technique ◽  
Current Loop ◽  
Input Disturbance ◽  
Current Controller ◽  
Simulation And Experiment ◽  
Equivalent Input Disturbance

The implementation and experimental validation of current control strategy based on predictive control and equivalent input disturbance approach is discussed for permanent magnet synchronous motor (PMSM) control system in the paper. First, to realize the current decoupling control, the deadbeat predictive current control technique is adopted in the current loop of PMSM. Indeed, it is well known that the traditional deadbeat current control cannot completely reject the disturbance and realize the zero error current tracking control. Then, according to the model uncertainties and the parameter variations in the motor, an equivalent input disturbance approach is introduced to estimate the lump disturbance in the system, which will be used in the feed-forward compensation. Thus, a compound current controller is designed, and the proposed algorithm reduces the tracking error caused by the disturbance; the robustness of the drive system is improved effectively. Finally, simulation and experiment are accomplished on the control prototype, and the results show the effectiveness of the proposed current control algorithm.

scholarly journals Nonlinear Position Control with Augmented Observer in Brushless DC Motor

Mathematics ◽  
2021 ◽  
Vol 9 (20) ◽  
pp. 2553
Author(s):  
Youngwoo Lee ◽  
Wonhee Kim
Keyword(s):  
Position Control ◽  
Tracking Error ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
State Variables ◽  
Brushless Dc ◽  
Current Controller ◽  
Position Controller ◽  
Error Dynamics ◽  
A Current

In this paper, position control using both a nonlinear position controller and a current controller with an augmented observer is proposed for a Brushless DC motor. The nonlinear position controller is designed to improve the position tracking performance based on the tracking error dynamics. The current controller is developed to track the desired currents generated from the desired torque, which is calculated based on the nonlinear position controller. The augmented observer is designed to obtain the knowledge of both state variables and disturbance. Closed-loop stability is proven through the Lyapunov theorem. Simulations were performed to evaluate the effectiveness of the proposed method.

Highly accurate average current controller using charge sharing method for LED lamp driver

2018 ◽  
Vol 54 (7) ◽  
pp. 439-441
Author(s):  
H.‐A Ahn ◽  
S.‐K. Hong ◽  
O.‐K. Kwon
Keyword(s):  
Charge Sharing ◽  
Current Controller ◽  
Average Current

scholarly journals Design of a Current Controller Based on a Two Step Procedure for Grid-Connected Converters

2021 ◽  
Author(s):  
EVERSON MATTOS ◽  
LUCAS CIELO BORIN ◽  
CAIO RUVIARO DANTAS OSóRIO ◽  
GUSTAVO GUILHERME KOCH ◽  
VINíCIUS FOLETTO MONTAGNER
Keyword(s):  
State Feedback ◽  
Tracking Error ◽  
Design Procedure ◽  
Control Design ◽  
Current Control ◽  
Lcl Filter ◽  
External Loop ◽  
Current Controller ◽  
Step Procedure ◽  
Grid Connected Converters

This paper provides a two step procedure for current control design of grid-connected converters with LCL filter. The proposed procedure is based on: i) an internal loop with state feedback, aiming on active damping of the LCL filter resonance; ii) an external loop with resonant controllers, aiming to ensure tracking of sinusoidal grid current references. The state feedback gains are computed based on pole location and the resonant control gains are computed based on the minimization of a closedloop tracking error index. A case study is shown to illustrate that the proposed control design procedure leads to grid-injected currents with suitable steady state and transient performances.

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