scholarly journals Implementation of the Predictive Current Control of Multi-Pulse Flexible Topology Thyristor Rectifier Under Unbalanced Source Voltages

2017 ◽  
Vol 11 (1) ◽  
pp. 14-22
Author(s):  
Zhang Damin ◽  
Wang Shitao ◽  
Kang Shaobo ◽  
Zhang Ji
Keyword(s):  
Control Strategy ◽  
Digital Signal Processor ◽  
Control Algorithm ◽  
Great Influence ◽  
Digital Signal ◽  
Current Control ◽  
Ideal Condition ◽  
Input Line ◽  
Front End ◽  
Current Controller

Predictive current control strategy has captured much concern recently in power converters. As for the multi-pulse flexible-topology thyristor rectifiers (m-PFTTR), the symmetry of the input line-to-line voltages has great influence upon the implementation of the control strategy. Existing literatures have mainly focused on the implementation under ideal condition, i.e., the input line-to-line voltages, being critical to the predictive current controller, were supposed to be symmetrical. In fact, the unbalance of the input line-to-line voltages usually exists in the windings of the zigzag transformer at front end and the A/D converter of the digital signal processor (DSP). This paper presents a new method to dynamically regulate the input line-to-line voltages to ensure the symmetry of each other. It is realized through the instantaneous correction of the bias values in the course of sampling, and the correction is embodied in the modified control algorithm. The paper includes analyses of the m-PFTTR as well as the control algorithm, simulation and experiments. Simulation and experimental results demonstrate the effectiveness of the presented method.

A New Realization Method of Control System for Magnetic Bearing

2010 ◽  
Vol 43 ◽  
pp. 32-35
Author(s):  
Wen Yue Zhang ◽  
Yan Jun Ge ◽  
Jun Yue Yang
Keyword(s):  
Control System ◽  
Power Amplifier ◽  
Control Strategy ◽  
Digital Signal Processor ◽  
Control Strategies ◽  
Digital Signal ◽  
Magnetic Bearing ◽  
Current Control ◽  
Common Control ◽  
The Difference

Aiming at the problems of complex circuit and parameter adjustment in traditional current type power amplifier of Magnetic Bearing (MB), a new realization method of control system based on DSP (Digital Signal Processor) is proposed. The difference with traditional power amplifier is that the current control loop is realized through software in DSP, so some advanced control strategies will be adopted easily, and the control parameters could be modified freely. Besides, the models established in MATLAB using common control strategy and advanced strategy are simulated separately, and the simulation results show the better effect can be obtained with the latter. Finally, the rotor of a 1-DOF MB prototype can be suspended within 0.01mm in the experiment, and the control strategy and parameters can be modified freely by software in DSP.

Improving the Dynamic Response during Field Weakening Control of IPMSM Drive System using Adaptive Hysteresis Current Control Technique

2016 ◽  
Vol 17 (3) ◽  
pp. 235-249 ◽  
Author(s):  
Amiya Naik ◽  
Anup Kumar Panda ◽  
Sanjeeb Kumar Kar
Keyword(s):  
Digital Signal Processor ◽  
High Speed ◽  
Digital Signal ◽  
Torque Ripple ◽  
Current Control ◽  
Control Technique ◽  
Switching Frequency ◽  
Motor Speed ◽  
Current Controller ◽  
Current Error

Abstract This paper presents the control of IPMSM drive in flux weakening region, for high speed applications. An adaptive hysteresis band current controller has been designed and implemented in this work to overcome the drawbacks which are present in case of conventional hysteresis band current controllers such as: high torque ripple, more current error, large variation in switching frequency etc. The proposed current controller is a hysteresis controller in which the hysteresis band is programmed as a function of variation of motor speed and load current. Any variation in those parameters causes an appropriate change in the band which in turns reduces the torque ripple as well as current error of the machine. The proposed scheme is modeled and tested in the MATLAB-Simulink environment for the effectiveness of the study. Further, the result is validated experimentally by using TMS320F2812 digital signal processor.

ON USING LINEAR PERIODICALLY RESETTING FILTER IN CURRENT CONTROL LOOP FOR ACTIVE POWER FILTER

2006 ◽  
Vol 15 (04) ◽  
pp. 615-639 ◽  
Author(s):  
LIDAN ZHOU ◽  
MUHAMMAD MANSOOR KHAN ◽  
FEIFENG JI ◽  
GANG YAO ◽  
DA XIE ◽  
...  
Keyword(s):  
Digital Signal Processor ◽  
Parallel Implementation ◽  
Active Power Filter ◽  
Digital Signal ◽  
High Gain ◽  
Active Power ◽  
Current Control ◽  
Control Technique ◽  
Current Loop ◽  
Power Filter

Among linear control techniques, deadbeat control has been widely accepted as a feasible current control technique as far as the digital signal processor (DSP) implementation of active power filter (APF) is concerned. This control technique uses high gain on the error measured at one sample, to control the error ideally to zero by the next sample. The high gain makes the control very sensitive to any error or noise in the measurements, which is always there in electrical systems. Especially, the periodic noise in parallel implementation of an inverter or APF demands a higher order filter at the current transducer output, which affects the dynamic response of the system. Recently, few papers have reported the results about the use of linear periodically resetting integrators (LPRI) as filter in some electronic applications. This paper is an attempt to generalize the idea of LPRI and here we introduce the notion of linear periodically resetting filter (LPRF). The frequency characteristics of an LPRF are analyzed. Possible application of these filters in current control is studied. It is shown that these filters can be adopted to improve the performances of a current loop in APF.

Virtual Gain for Audio Windows

1998 ◽  
Vol 7 (1) ◽  
pp. 53-66 ◽  
Author(s):  
Michael Cohen ◽  
Nobuo Koizumi
Keyword(s):  
User Interface ◽  
Real Time ◽  
Digital Signal Processor ◽  
Digital Signal ◽  
Mutual Distance ◽  
Front End ◽  
Spatial Sound ◽  
Gain Adjustment ◽  
Audio System ◽  
Signal Processor

Audio windowing is a front-end, or user interface, to an audio system with a real-time spatial sound back end. Complementing directionalization by a digital signal processor (DSP), gain adjustment is used to control the volume of the various mixels ([sound] mixing elements). Virtual gain can be synthesized from components derived from collective iconic size, mutual distance, orientation and directivity, and selectively enabled according to room-wise partitioning of sources across sinks. This paper describes a derivation of virtual gain, and outlines the deployment of these expressions in an audio windowing system.

scholarly journals Design and Analysis of the STATCOM Based on Diode Clamped Multilevel Converter Using Model Predictive Current Control Strategy

2021 ◽  
Vol 23 (3) ◽  
pp. 221-228
Author(s):  
Raaed Faleh Hassan ◽  
Suha Sabah Shyaa
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Control Strategy ◽  
Control Algorithm ◽  
Reactive Power ◽  
Current Control ◽  
Multilevel Converter ◽  
Static Synchronous Compensator ◽  
Multi Level ◽  
And Control

In recent decades, multi-level converters have become popular and used in many power systems applications. Compared with conventional converters, multi-level converters contribute to reducing the voltage stress on the switching devices and enhancing the power quality delivered to the load. In this paper, the study of the five-level diode clamped multilevel converter based static synchronous compensator has been accomplished. Model Predictive current control strategy which a type of modern control algorithms was employed for driving the proposed compensator. The suggested five level converter controlled by model predictive current control is firstly examined to verify that this control algorithm is appropriate for achieving the desired performance. Then the proposed converter and control combination is employed and simulated as a static synchronous compensator in distributed power system. Moreover, in order to examine the robustness of this compensator, the load status is suggested to be heavy inductive. Simulation process has been performed using MATLAB – SIMULINK software package. The results show that the implemented configuration (converter and control algorithm) provides high power quality improvement with adequate reactive power compensation.

scholarly journals Effect of Utility Voltage Distortion on the Performance of Different Control Strategies for Shunt Active Power Filter

2017 ◽  
Vol 2 (8) ◽  
pp. 27
Author(s):  
Ahmed Mohammed Attiya Soliman ◽  
Salah Kamal El-Sayed ◽  
M. A. Mehanna
Keyword(s):  
Power Quality ◽  
Control Strategy ◽  
Control Algorithm ◽  
Control Strategies ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Non Linear

The widespread use of power electronics in industrial, commercial and even residential electrical equipment like non-linear loads causes deterioration of the quality of the electric power supply with distortion of the supply voltage and in order to mitigate this quality the shunt active power filter (SAPF) is the suitable and effective solution for harmonic elimination and reactive power compensation and lead to power quality (PQ) improvement, therefor an effective and accurate current control technique is needed in order for a SAPF where control algorithm is the heart for SAPF to perform this function and its dynamic performance is mainly depends on these control strategy. This paper proposes three different current control strategies (CCS) based on instantaneous power theory and generalized fryze theory which used for the generation or extraction of the accurate reference current signals which comparing with the actual signals through hysteresis current technique (HCT) to produce suitable gating signals for SAPF and discusses the performance for these controllers when the supply bus voltage is distorted with scope on the efficient control algorithm. Matlab / Simulink simulation results are presented to validate the control strategy and demonstrate the effectiveness of SAPF to provide mitigation of power quality problems for non-linear load to reach an acceptable value comply with recommended standards.

Adaptive Seeking Control for Magnetic Disk Drives

1999 ◽  
Author(s):  
Masahito Kobayashi ◽  
Takashi Yamaguchi ◽  
Hiromu Hirai
Keyword(s):  
Control Strategy ◽  
Digital Signal Processor ◽  
Servo System ◽  
Digital Signal ◽  
Disk Drive ◽  
Disk Drives ◽  
Control Performance ◽  
Magnetic Disk ◽  
Velocity Error ◽  
Signal Processor

Abstract The digital servo system of a magnetic disk drive has to overcome poor seek control performance caused by the mechanical gain variations and force disturbance variations in each disk. This paper presents an adaptive seek control strategy which adjusts the acceleration feedforward gain to minimize the square of the velocity error. The adaptive seek control is implemented using a digital signal processor and its control performance is good.

An Improved Predictive Current Control Scheme for Three-phase Voltage Source Converters

2016 ◽  
Vol 25 (11) ◽  
pp. 1650133 ◽  
Author(s):  
Meng Wang ◽  
Yanyan Shi
Keyword(s):  
Digital Signal Processor ◽  
Dynamic Performance ◽  
Digital Signal ◽  
Sampling Interval ◽  
Current Control ◽  
Voltage Source ◽  
Calculation Time ◽  
Pwm Converters ◽  
Three Phase ◽  
Control Scheme

For a fully digital control of PWM converters, considerable research has been done based on the predictive current control (PCC) scheme. However, it requires a large amount of calculation in the step of experimental implementation. Besides, when compared with the classical linear control scheme, the sampling interval of the PCC scheme must be shorter to obtain the same control performance for current. Due to this, a digital signal processor with excellent performance is required. This paper proposes an improved simplified model PCC scheme for three-phase PWM converters. The main objective is to simplify the PCC scheme. Also, the proposed control scheme is able to reduce the calculation time without affecting the performance. Simulations and experiments are carried out to investigate the presented novel predictive current control scheme. The results indicate that the three-phase PWM converter has excellent static and dynamic performance with the proposed scheme. Besides, the calculation time can be obviously shortened.

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