A Hysteretic Current Controller for Active Power Filter (APF) with Constant Frequency

2012 ◽  
Vol 460 ◽  
pp. 308-312
Author(s):  
Qing Shou Song
Keyword(s):  
Control Method ◽  
Current Control ◽  
Switching Frequency ◽  
Matlab Simulation ◽  
Constant Frequency ◽  
Hysteresis Current Control ◽  
Power Filter ◽  
Switching Losses ◽  
Current Controller ◽  
Frequency State

In accordance with the advantage of conventional hysteresis current control method, this paper advances a novel control method for APF. In conventional hysteresis current control, the hysteresis band (HB) is fixed and actual compensating current is limited in a fixed HB. Firstly, the connection between HB and switching frequency must be found correctly. Then, the variable hysteresis band current controller is designed according to the connection. Finally, the Matlab simulation results show that the switching frequency of VSI is held nearly constant and the proposed controller can track reference current well[1]. The problems of increasing switching losses and audible noise which happened in high-frequency state can be resolved in conventional hysteresis current control.

A New Hysteresis Current Control Method for Active Power Filter with Lower Switching Losses

2014 ◽  
Vol 1030-1032 ◽  
pp. 1423-1431
Author(s):  
Jiang Zeng ◽  
Li Peng Huang
Keyword(s):  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Band Width ◽  
Switching Frequency ◽  
Hysteresis Current Control ◽  
Power Filter ◽  
Switching Losses ◽  
Control Precision

This paper presents a new hysteresis current control method for APF(active power filter) that can reduce switching losses effectively by means of adjusting the hysteresis band width according to the current size. On one hand, this method adjust the overall hysteresis band width according to the size of absolute norm of three-phase current that optimize the overall switching frequency, reduce the total switching losses effectively. On the other hand, it adjust hysteresis band width of each phase by comparing the output reference current to reduce the switching times which switching losses is larger, while increasing the switching frequency which switching losses is smaller, so as to maintain overall control precision. Computer simulation is conducted on an electromagnetic transient program. The results show that the new method can effectively reduce the switching losses under the same control accuracy and total switching frequency.

scholarly journals Review and Simulation of Fixed and Adaptive Hysteresis Current Control Considering Switching Losses and High-Frequency Harmonics

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Hani Vahedi ◽  
Abdolreza Sheikholeslami ◽  
Mohammad Tavakoli Bina ◽  
Mahmood Vahedi
Keyword(s):  
Fourier Transform ◽  
High Frequency ◽  
Current Control ◽  
Switching Frequency ◽  
Hysteresis Current Control ◽  
Switching Losses ◽  
Frequency Components ◽  
Source Current ◽  
Harmonic Components ◽  
The Fourier Transform

Hysteresis Current Control (HCC) is widely used due to its simplicity in implementation, fast and accurate response. However, the main issue is its variable switching frequency which leads to extraswitching losses and injecting high-frequency harmonics into the system current. To solve this problem, adaptive hysteresis current control (AHCC) has been introduced which produces hysteresis bandwidth which instantaneously results in smoother and constant switching frequency. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the adaptive hysteresis current control is explained that leads to fixing the switching frequency and reducing the high-frequency components in source current waveform. Due to these advantages of AHCC, the switching frequency and switching losses will be diminished appropriately. Some simulations are done in MATLAB/Simulink. The Fourier Transform and THD results of source and load currents and the instantaneous switching frequency diagram are discussed to prove the efficiency of this method. The Fourier Transform and THD results of source and load currents are discussed to prove the validity of this method.

scholarly journals A simplified hysteresis current control for cascaded converter fed switched reluctance motor

2019 ◽  
Vol 9 (6) ◽  
pp. 5095
Author(s):  
Anuradha Devi Tellapati ◽  
Malligunta Kiran Kumar
Keyword(s):  
Control Method ◽  
Switched Reluctance Motor ◽  
Industrial Applications ◽  
Current Control ◽  
Switched Reluctance ◽  
Hysteresis Current Control ◽  
Switching Losses ◽  
Cascaded Converter ◽  
Reluctance Motor ◽  
Power Switches

<p>Simple constructional features with no windings on rotor circuit and robustness make switched reluctance motor (SRM) a most used motors in industrial applications. Peak motor voltage rating depends on the rated voltage of the power switches. In conventional asymmetrical converter driving SRM, voltage rating of the motor depends on rating of power electronic switches in converter. Demand to rise the motor rating insists to put pressure on converter switching components which results in increased switching losses. A cascaded converter topology for SRM reduces the rating of switching components as compared to conventional converters for SRM. This paper presents a cascaded converter fed SRM drive with reduced switching losses. The paper presents a simplified hysteresis current control (HCC) for cascaded converter fed SRM. Simplified HCC control method reduces switching losses as HCC is applied to only one bridge of cascaded converter. Though the performance of the SRM remains same with cascaded converter fed SRM with HCC applied to only one bridge or to two bridges and with conventional asymmetrical converter, the switching losses are reduced to a great extent when HCC applied to one bridge of cascaded converter fed SRM. Performance of SRM is illustrated with conventional asymmetrical converter fed SRM and is compared to cascaded converter while HCC applied to only one bridge and applied to two bridges of cascaded converter. Proposed work is simulated using MATLAB/SIMULINK and results are presented.</p>

scholarly journals Fuzzy hysteresis current control of five phase permanent magnet motor under open-circuit faults

2018 ◽  
Vol 7 (2.28) ◽  
pp. 369
Author(s):  
Mekri Fatiha ◽  
Oum El Fadhel Loubaba Bekri
Keyword(s):  
Open Circuit ◽  
Current Control ◽  
Switching Frequency ◽  
Permanent Magnet Motor ◽  
Torque Density ◽  
Hysteresis Current Control ◽  
Current Controller ◽  
Reference Current Generation ◽  
Two Phases ◽  
Hysteresis Control

This paper presents a new current controller of a PWM of multiphase PM machines with a fuzzy logic band. With this kind of system it is possible to determine optimal currents references which maximize the torque density of the system when one or two phases are open circuited. We propose in this paper to combine this optimal reference current generation with fuzzy hysteresis control band. This solution allows a good tracking of these unconventional reference currents with a fixed switching frequency for the VSI. The study carried on simulation via software MatLab/Simulink.  

Double-Hysteresis Current Control Strategy of PWM Rectifier

2013 ◽  
Vol 433-435 ◽  
pp. 1037-1044
Author(s):  
Wen Shao Bu ◽  
Lei Lei Xu ◽  
Xian Bo Wang ◽  
Xin Win Niu
Keyword(s):  
Control Method ◽  
Current Control ◽  
Switching Frequency ◽  
Current Response ◽  
Pwm Rectifier ◽  
Hysteresis Current Control ◽  
Switching Power ◽  
Three Phase ◽  
Hysteresis Controller ◽  
Hysteresis Control

to hold the merits of the traditional hysteresis controller, and at the same time, hold back the change of switching frequency and reduce the switching power loss in hysteresis control of PWM rectifier, based on the relationship between line currents and switching status, an improved algorithm of double-hysteresis current control method for three-phase voltage-type PWM converter was proposed. In the strategy, the position of reference voltage vector can be detected by double hysteresis, PLL circuit can detect the output of switching states. The proposed algorithms not only hold the merits of traditional hysteresis, such as quick current response and current limited capacity, but also, it can overcome the drawback of non-fixed switching frequency of traditional hysteresis. The algorithm has been simulated and verified by MATLAB/simulink platform, and the system operates stably.

Design and Digital Implementation of Constant Frequency Hysteresis Current Controller for Three-Phase Voltage Source Inverter Using TMS320F2812

2014 ◽  
Vol 15 (1) ◽  
pp. 13-23 ◽  
Author(s):  
D. Kalyanraj ◽  
S. Lenin Prakash
Keyword(s):  
Current Control ◽  
Control Technique ◽  
Voltage Source ◽  
Phase Voltage ◽  
Inductive Load ◽  
Constant Frequency ◽  
Digital Implementation ◽  
Hysteresis Current Control ◽  
Current Controller ◽  
Three Phase

Abstract A constant frequency hysteresis current control technique for a three-phase voltage source inverter (VSI) has been developed for AC drives, power quality and renewable energy applications. This paper presents a digital implementation of a constant frequency hysteresis current control technique for a three-phase VSI feeding an inductive load, using digital signal controller TMS320F2812. The limitations of variable frequency hysteresis control have been discussed and overcoming these limitations by means of digital implementation has been proposed. The complete design procedure of the proposed technique has been presented with an illustrative example. The three-phase VSI feeding an inductive load has also been simulated by using MATLAB and the simulation results have been presented. The hardware results of hysteresis current controlled three-phase VSI feeding an inductive load have been presented. Also the performance analysis of the hysteresis current controller has been presented. Operation of this controller has also been explained with a help of phase plane trajectory of hysteresis controller.

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