scholarly journals An Efficient Control Algorithm for Single Phase Power Factor Pre regulators to Achieve Fast Transient Response and Unity Power Factor

2011 ◽  
pp. 14-18
Author(s):  
Hardik K. Lakhani ◽  
N. Arun
Keyword(s):  
Power Factor ◽  
Feedback Linearization ◽  
Control Algorithm ◽  
Single Phase ◽  
Current Loop ◽  
Loop Control ◽  
Fast Transient Response ◽  
Control Functions ◽  
Control Rules ◽  
Error Dynamics

In this paper, an approach to generate robust control algorithm for the single phase PFC boost converter is presented. This control rules provide fast output response while maintaining high power factor. This approach is based on derivation of the control functions for both current loop and voltage loop which is multi-loop control structure. Designing of the control parameters are based on the required transient and the steady-state responses. Due to application of feedback linearization the performance of the of this control scheme is robust under all practical conditions. This method eliminates the nonlinearity and the dependence of the error dynamics on the input disturbance. Experiments are conducted to evaluate the control performance.

scholarly journals Interleaved DC-DC Converter with Discrete Duty Cycle and Open Loop Control

2016 ◽  
Vol 53 (4) ◽  
pp. 14-21
Author(s):  
K. Kroics ◽  
A. Sokolovs
Keyword(s):  
Duty Cycle ◽  
Control Algorithm ◽  
Open Loop ◽  
Current Loop ◽  
Open Loop Control ◽  
Output Current ◽  
Loop Control ◽  
Control Principle ◽  
Conduction Mode ◽  
Current Ripple

Abstract The authors present the control principle of the multiphase interleaved DC-DC converter that can be used to vastly reduce output current ripple of the converter. The control algorithm can be easily implemented by using microcontroller without current loop in each phase. The converter works in discontinuous conduction mode (DCM) but close to boundary conduction mode (BCM). The DC-DC converter with such a control algorithm is useful in applications that do not require precise current adjustment. The prototype of the converter has been built. The experimental results of the current ripple are presented in the paper.

scholarly journals Feedback Linearization and Sliding Mode Control for VIENNA Rectifier Based on Differential Geometry Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xiang Lu ◽  
Yunxiang Xie ◽  
Li Chen
Keyword(s):  
Differential Geometry ◽  
Sliding Mode Control ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Sliding Mode ◽  
Current Loop ◽  
Loop Control ◽  
Mode Control ◽  
Vienna Rectifier ◽  
Feedback Linearization Control

Aiming at the nonlinear characteristics of VIENNA rectifier and using differential geometry theory, a dual closed-loop control strategy is proposed, that is, outer voltage loop using sliding mode control strategy and inner current loop using feedback linearization control strategy. On the basis of establishing the nonlinear mathematical model of VIENNA rectifier ind-qsynchronous rotating coordinate system, an affine nonlinear model of VIENNA rectifier is established. The theory of feedback linearization is utilized to linearize the inner current loop so as to realize thed-qaxis variable decoupling. The control law of outer voltage loop is deduced by utilizing sliding mode control and index reaching law. In order to verify the feasibility of the proposed control strategy, simulation model is built in simulation platform of Matlab/Simulink. Simulation results verify the validity of the proposed control strategy, and the controller has a strong robustness in the case of parameter variations or load disturbances.

A new scheme for power factor correction and active filtering for six-pulse converters loads

2009 ◽  
Vol 57 (2) ◽  
pp. 157-169 ◽  
Author(s):  
Y. Han ◽  
M. Khan ◽  
L. Xu ◽  
G. Yao ◽  
L. Zhou ◽  
...  
Keyword(s):  
Power Factor ◽  
Power Flow ◽  
Power Factor Correction ◽  
Active Power ◽  
Estimation Accuracy ◽  
Voltage Source ◽  
Current Loop ◽  
Loop Control ◽  
Proportional Integral ◽  
Active Filtering

A new scheme for power factor correction and active filtering for six-pulse converters loads This paper presents a novel harmonic-free power factor correction (PFC) topology based on T-type active power filter (APF), which is dedicated for power factor improvement and harmonic filtering for six-pulse converter loads. The cascaded controller structure is adopted for the proposed system, namely, the inner current loop and outer voltage loop. The current-loop control scheme is based on a decoupled state-space equations of the T-type APF using separate proportional-integral (PI) controllers in d-axis and q-axis of the synchronous rotating reference frame (SRRF) synchronized with grid voltages, respectively. The fundamental components of load-side currents are feed forwarded in the current-loop using two groups of synchronous frame adaptive linear neural networks (ADALINEs) to ensure estimation accuracy and a fast dynamic response. A separate proportional-integral (PI) controller is adopted in the outer voltage loop for balancing the active power flow of the voltage source inverter (VSI) dc-side capacitor. The experimental results confirm well with the theoretical analysis.

A Novel Single Phase bridgeless AC/DC PFC converter for Low Total Harmonics Distortion and High Power Factor

2018 ◽  
Vol 9 (1) ◽  
pp. 17
Author(s):  
Santhi Mary Antony ◽  
Godwin Immanuel
Keyword(s):  
Power Factor ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Experimental System ◽  
Pi Controller ◽  
Current Loop ◽  
Nonlinear Loads ◽  
Dc Power ◽  
High Power Factor ◽  
Lc Filter

Now day’s the power factor has become a major problem in power system to improve the power quality of the grid, as power factor is affected on the grid due to the nonlinear loads connected to it. Single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed. By removing the input bridge in conventional PFC converters, the control circuit is simplified; the total harmonics distortion (THD) and power factor (PF) are improved. The PI controller operates in two loops one is the outer control loop which calculates the reference current through LC filter and signal processing. Inner current loop generates PWM switching signals through the PI controller. The output of the proposed PFC topology is verified for prototype using MATLAB circuit simulations. The experimental system is developed, and the simulation results are obtained.

Design of a Single Phase Power Factor Corrector

2010 ◽  
Vol 29-32 ◽  
pp. 2473-2478
Author(s):  
Hou Sheng Zhang
Keyword(s):  
Power Factor ◽  
High Power ◽  
Single Phase ◽  
Fundamental Principle ◽  
Current Loop ◽  
Boost Converters ◽  
Soft Start ◽  
High Power Factor ◽  
Power Factor Corrector ◽  
Conduction Mode

This paper designs a novel single phase high power factor rectifier with IR1150 as its main control chip, which main circuit uses boost topology. The fundamental principle of the proposed rectifier is introduced. The IR1150 control IC based on one cycle control is intended for boost converters for power factor correction operating at a fixed frequency in continuous conduction mode (CCM). The use of the IC will make the PFC circuit design easily, the volume of the rectifier small and the efficiency enhancing. The modules of the proposed rectifier such as current loop and over-current protection, voltage loop and over-voltage protection, soft start, and so on, are analyzed and designed respectively in detail. Experimental results of the designed 600W prototype prove that the boost high power factor rectifier designed is rational and reliable, its power factor can reach 0.994.

Two-Level Grid-Connected Discharge Inverter System of Power Battery Based on LLC

2014 ◽  
Vol 1070-1072 ◽  
pp. 1278-1281
Author(s):  
Yue Yu ◽  
Qiang Yin ◽  
Meng Xue Xie ◽  
Xiao Dan Ren
Keyword(s):  
Power Factor ◽  
Constant Current ◽  
Current Loop ◽  
Loop Control ◽  
External Voltage ◽  
Power Battery ◽  
High Power Factor ◽  
Dc Bus ◽  
Bus Voltage ◽  
Battery Discharge

In order to overcome the large amounts of energy waste in the process of power battery discharge, the two-level grid-connected discharge inverter system of power battery based on LLC is designed. It is composed of LLC resonant full-bridge DC/DC and inverter. The DC-bus voltage is changed and the discharge current is stabilized by adjusting the frequency of the LLC resonant full-bridge DC/DC. The dual-loop control is applied in the inverter system. The stabilization of DC-bus voltage is achieved in the external voltage loop, while the grid-connected is implemented by controlling the grid-connected current in the inner current loop. A prototype is manufactured. The experiment results indicate that it has the characteristics of low harmonic current, high power factor and constant current discharge, and then proves that the inverter system is effective.

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.

Nonlinear Cascade Control of the Joint-Structure in EMS High Speed Maglev Train

2013 ◽  
Vol 765-767 ◽  
pp. 1992-1997
Author(s):  
Jin Hui Huang ◽  
A Ming Hao ◽  
Xiao Long Li ◽  
Long Hua She
Keyword(s):  
High Speed ◽  
Control Algorithm ◽  
Cascade Control ◽  
Current Loop ◽  
Maglev Train ◽  
Disturbing Force ◽  
Loop Control ◽  
Linear Cascade ◽  
Advantages And Disadvantages ◽  
Joint Structure

In order to strengthen the high-speed maglev trains anti-disturbance ability, the traditional linear cascade control algorithm has been improved. Firstly, the mathematical model of the joint-structure in the high-speed maglev train was established according to the dynamics and electromagnetism theory.Secondly,the advantages and disadvantages of the linear cascade control algorithm were analysed.Thirdly,the relationship between the current loop and position loop control parameters and the system performance was discussed .Finally,the nonlinear cascade control algorithm of the joint-structure in high-speed maglev train was introduced. In the algorithm,the current loop controller gain would be reduced when the positional deviation increases. At the same time, the gain of the position loop controller would be increased. The simulation results show that the suspension joint-structure gap changes caused by the failure of a single suspension point or disturbing force ,of systems with nonlinear cascade control algorithm were less than that of systems with linear cascade control algorithm. The new algorithm can improve the anti-disturbance ability of the maglev train,It can also ensure the safety and comfort of passengers.

A Single Phase High Power Factor Rectifier with UCC28019

2010 ◽  
Vol 29-32 ◽  
pp. 2462-2466
Author(s):  
Hou Sheng Zhang
Keyword(s):  
Circuit Design ◽  
Power Factor ◽  
High Power ◽  
Single Phase ◽  
Power Factor Correction ◽  
Fundamental Principle ◽  
Active Power ◽  
Current Loop ◽  
High Power Factor ◽  
Conduction Mode

Power factor correction (PFC) is an effective method to reduce harmonic current in power grid. A novel boost high power factor rectifier with UCC28019 is proposed. The UCC28019 8-pin active Power Factor Correction controller uses the boost topology operating in continuous conduction mode (CCM). It does not need multipliers. The use of the IC will make the PFC circuit design easily and the volume of the rectifier small. The fundamental principle of the proposed rectifier is introduced. Its sections such as current loop and over-current protection, voltage loop and over-voltage protection, and so on, are analyzed and designed respectively in detail. Experimental results of the designed 350W prototype prove that the boost high power factor rectifier is rational and reliable, its power factor can reach 0.992, and its application prospect is wide.

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