scholarly journals A simplified control strategy for single-phase UPS inverters

2014 ◽  
Vol 62 (2) ◽  
pp. 367-373 ◽  
Author(s):  
M. Monfared
Keyword(s):  
Control Strategy ◽  
Single Phase ◽  
Design Procedure ◽  
Feedback Signal ◽  
Current Loop ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Uninterruptible Power ◽  
Lc Filter

Abstract Though there are many strategies to control single-phase uninterruptible power supply (UPS) inverters, they suffer from some drawbacks, the main being complexity. This paper proposes a simple dual-loop controller for the single-phase UPS inverter with the LC filter. The suggested control scheme uses the capacitor current as the feedback signal in the inner current loop. No fictitious phase generation or reference frame transformations are required, and simple proportional gains are employed as both voltage and current regulators. A feedforward of the derivative of the output voltage is also proposed, which significantly improves the performance of the closed loop control system. Then, based on the model of the inverter with the proposed control strategy, a simple and systematic design procedure is presented. Finally, the theoretical achievements are supported by extensive simulations.

Velocity-Current Double Closed-Loop Control Model and Simulation of BLDCM in Pure Electric Vehicle Applications

2012 ◽  
Vol 466-467 ◽  
pp. 881-885
Author(s):  
Chang Li Zhang ◽  
Jin Jin Zhang ◽  
Hai Bo Liu
Keyword(s):  
Closed Loop ◽  
Current Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Simulating Experiment ◽  
Model And Simulation ◽  
Internal Parameters ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
Control System Model

Traditional control models of BLDCM, in which only the internal parameters of motors are considered, have some shortcoming in smoothing the vehicle velocity. To achieve a better controlling capability, a velocity-current double closed-loop control system model for BLDCM of PEV is constructed on Matlab, in which the inner current loop is for quickly adjusting BLDCM’s actions, the outer velocity loop is for an optimized control of PEV’s speed. The results of a simulating experiment show that the new model has a good performance and a strong anti-interfere ability. Therefore, this model is applicable for designing and debugging of BLDCM in PEV applications.

Research on Control Strategy for the Three-Phase Grid-Connected Inverter

2012 ◽  
Vol 614-615 ◽  
pp. 1578-1582
Author(s):  
Chun Qing Qi ◽  
Yi Ruan ◽  
Feng Wen Cao
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Response Speed ◽  
Current Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Three Phase ◽  
Control Scheme ◽  
Loop Control System ◽  
Grid Connected Inverter

This paper proposes a control strategy，based on the grid voltage oriented vector control (VOC), which makes three-phase inverter control the active and reactive power of grid-connected inverter under the premise of the direct current control. This paper analyzes the principle of three phase photovoltaic grid connected inverter and describes the control structure of the inverter. The control strategy can overcome the deficiencies of the indirect current control scheme. This paper designs the current closed-loop control system, which not only improve the system dynamic response speed and output current waveform quality, while also reduce its sensitivity to parameter changes to improve the robustness of the system. The simulation results show the validity of control strategy proposed.

Novel Design for LC-VSI Double-Loop Control System of Microsources in Microgrid Based on Typical System Setting Method

2014 ◽  
Vol 556-562 ◽  
pp. 2436-2439
Author(s):  
Jia Ming Li ◽  
Peng Li
Keyword(s):  
Control System ◽  
Power Control ◽  
Control Strategy ◽  
Voltage Source ◽  
Double Loop ◽  
Loop Control ◽  
Typical System ◽  
Loop Control System ◽  
Lc Filter ◽  
Novel Design

Control strategy of inverter is the foundation of microsource’s power control. Based on a typical system setting method, double-loop control system of LC filter and inverter for voltage-source inverter in microgrid is designed. The feasibility is verified via the simulation.

scholarly journals Adaptive Barrier Control for Nonlinear Servomechanisms with Friction Compensation

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shubo Wang ◽  
Haisheng Yu ◽  
Xuehui Gao ◽  
Na Wang
Keyword(s):  
Control Method ◽  
Design Procedure ◽  
Lyapunov Stability Theory ◽  
Friction Compensation ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Full State ◽  
Loop Control System ◽  
The Stability ◽  
The Given

This paper proposes an adaptive barrier controller for servomechanisms with friction compensation. A modified LuGre model is used to capture friction dynamics of servomechanisms. This model is incorporated into an augmented neural network (NN) to account for the unknown nonlinearities. Moreover, a barrier Lyapunov function (BLF) is utilized to each step in a backstepping design procedure. Then, a novel adaptive control method is well suggested to ensure that the full-state constraints are within the given boundary. The stability of the closed-loop control system is proved using Lyapunov stability theory. Comparative experiments on a turntable servomechanism confirm the effectiveness of the devised control method.

Simulation Study on Single-Phase Parallel Type of APF Double Loop Control Technique

2014 ◽  
Vol 623 ◽  
pp. 187-194
Author(s):  
Sui Zhang ◽  
Wei Su ◽  
Yu Ku Qiao ◽  
Dong Dong Wang ◽  
Ji Luo
Keyword(s):  
Single Phase ◽  
Harmonic Wave ◽  
Design Procedure ◽  
Control Technique ◽  
Current Loop ◽  
System Control ◽  
Double Loop ◽  
Control Parameters ◽  
Loop Control ◽  
Parallel Type

This paper begins with analyzing the hazard of system harmonics and proposing the effectiveness of active power filter (APF) in harmonic wave inhibition. Against the background of single-phase parallel type of APF, its working principle is introduced and its mathematical model is built. Next, analyzed in details is the single-phase parallel type of APF double loop control system based on outer voltage loop and inner current loop, with the specific design procedure of PI control parameters of outer voltage loop and inner current loop presented. Finally, through MATLAB simulation, the designed system control parameters undergo verification. The simulation result indicates such single-phase parallel type of APF based on the double loop PI controller with outer voltage loop and inner current loop can ensure stability of the DC bus voltage and make effective compensation for harmonics over the mid-and low-frequency bands.

Modeling and Simulation of BLDCM Double Closed-Loop Control System Based on Matlab

2014 ◽  
Vol 898 ◽  
pp. 878-882 ◽  
Author(s):  
Kai Yu Yang ◽  
Rui Song ◽  
Hai Dong Wu ◽  
Yan Li Zou
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Dc Motor ◽  
Brushless Dc Motor ◽  
Current Loop ◽  
Closed Loop Control ◽  
Loop Control ◽  
Brushless Dc ◽  
Closed Loop Control System ◽  
Loop Control System

Based on the mathematical model of brushless DC motor, a simulation model of brushless DC motor (BLDCM) double closed-loop control system is established by using the voltage equation, the electromagnetic torque equation and the motion equation based on Matlab, then introduces the sub-modules of the controlling system in detail. PID control is used in the speed loop and hysteresis current track of PWM is used in the current loop. The reasonability and validity are testified by the simulation results and this novel method offers a new thought way for designing and debugging actual motors.

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