scholarly journals ADC Quantization Effects in Two-Loop Digital Current Controlled DC-DC Power Converters: Analysis and Design Guidelines

2020 ◽  
Vol 10 (20) ◽  
pp. 7179
Author(s):  
Catalina González-Castaño ◽  
Carlos Restrepo ◽  
Roberto Giral ◽  
Enric Vidal-Idiarte ◽  
Javier Calvente
Keyword(s):  
Pulse Width Modulation ◽  
Digital Signal ◽  
Boost Converter ◽  
Design Guidelines ◽  
Current Control ◽  
Control Laws ◽  
Analysis And Design ◽  
External Loop ◽  
Digitally Controlled ◽  
Average Current

This paper analyzes the presence of undesired quantization-induced perturbations (QIP) in a dc-dc buck-boost converter using a two-loop digital current control. This work introduces design conditions regarding control laws gains and signal quantization to avoid the quantization effects due to the addition of the outer voltage loop in a digital current controlled converter. The two-loop controller is composed of a multisampled average current control (MACC) in the inner current-programmed loop and a proportional-integrator compensator at the external loop. QIP conditions have been evaluated through simulations and experiments using a digitally controlled pulse width modulation (DPWM) buck-boost converter. A 400 V 1.6 kW proof-of-concept converter has been used to illustrate the presence of QIP and verify the design conditions. The controller is programmed in a digital signal controller (DSC) TMS320F28377S with a DPWM with 8.96-bit equivalent resolution, a 12-bit ADC for current sampling, and a 12-bit ADC for voltage sampling or a 16-bit ADC for voltage error sampling.

scholarly journals Analysis and Design Guidelines for Current Control Loops of Grid-Connected Converters Based on Mathematical Models

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5849
Author(s):  
Gonzalo Abad ◽  
Alain Sanchez-Ruiz ◽  
Juan José Valera-García ◽  
Aritz Milikua
Keyword(s):  
Mathematical Models ◽  
Reference Frame ◽  
Design Guidelines ◽  
Current Control ◽  
Active Filters ◽  
Current Harmonics ◽  
Control Loops ◽  
Analysis And Design ◽  
Dual Vector ◽  
Grid Connected Converters

Having a method for analyzing and designing regulators of controls that contain many current loops such as active filters is not a trivial task. There can be many parameters of regulators and filters that must be carefully selected in order to fulfill certain desired requirements. For instance, these can be stability, dynamic response, robustness under uncertainty of parameters, and rejection capability to switching harmonics. Hence, this paper provides general analysis guidelines for designing current control loops by using mathematical models in an αβ reference frame. Then, by using the proposed modeling tool, a multi-objective tuning algorithm is proposed that helps obtain all the control loops’ regulator and filter parameters, meeting all the desired requirements. Thus, the proposed analysis and design methodology is illustrated by applying it to three different controls conceived in a dq rotating reference frame with PI (Proportional Integral) regulators. The first control presents two current loops (simple dq current control), the second control uses four current loops (dual vector control, for unbalanced loads), while the third control presents eight current loops (active filter controlling current harmonics). Several experimental and simulation results show the effectiveness and usefulness of the proposed method. Since the mathematical model employed is in the αβ reference frame, it can also be easily applied to controls conceived in a αβ reference frame using resonant regulators, providing also a common comparative framework.

Dynamic Characteristics of Magnetically-Levitated Vehicle Systems

1997 ◽  
Vol 50 (11) ◽  
pp. 647-670 ◽  
Author(s):  
Y. Cai ◽  
S. S. Chen
Keyword(s):  
Dynamic Characteristics ◽  
Transportation Systems ◽  
Design Guidelines ◽  
Ride Quality ◽  
Electrodynamic System ◽  
Control Laws ◽  
Analysis And Design ◽  
Maglev Vehicle ◽  
Magnetically Levitated ◽  
Force Components

The dynamic response of magnetically-levitated (maglev) ground transportation systems has important consequences for safety and ride quality, guideway design, and system costs. This article, which reviews various aspects of the dynamic characteristics, experiments and analysis, and design guidelines for maglev systems, discusses electrodynamic system (EDS) maglev vehicle stability, motion-dependent magnetic force components, guideway characteristics, vehicle/guideway interaction, ride quality, suspension control laws, aerodynamic loads and other excitations, and research needs. This review article includes 157 references.

Simulation Study of PFC Boost Converter Based on Predicted Average Current Control

2012 ◽  
Vol 462 ◽  
pp. 738-742 ◽  
Author(s):  
Man Yuan Ye ◽  
Song Li
Keyword(s):  
Power Factor ◽  
Control Strategies ◽  
Harmonic Distortion ◽  
Input Power ◽  
Boost Converter ◽  
Current Control ◽  
Simulation Software ◽  
Voltage Control Strategy ◽  
Average Current ◽  
Average Current Control

Introduced to predict average current control PFC Boost converter structure, and analyzes its operating principle, the average current control strategies equation is given by derivation. And a model of predict average current control PFC Boost converter is gained using Matlab Simulink simulation software and SimPowerSystems toolbox. Simulation results show that the predicted average current control PFC Boost converter with control circuit is simple and reliable, high input power factor, anti-interference ability, current harmonic distortion, etc, and is forecast to average voltage control strategy for the active power factor correction provides a novel, simple and feasible control methods.

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