scholarly journals Adaptive hysteresis band current control of grid connected PV inverter

2021 ◽  
Vol 11 (4) ◽  
pp. 2856
Author(s):  
R. S. Ravi Sankar ◽  
A. Venkatesh ◽  
Deepika Kollipara
Keyword(s):  
Supply Voltage ◽  
Time Domain Analysis ◽  
Current Control ◽  
Switching Frequency ◽  
Pv Inverter ◽  
Machine Drive ◽  
Current Controller ◽  
Hysteresis Controller ◽  
Distribution Generation

In this paper, adaptive hysteresis band current controller is implemented to control the current injected into the grid. Initially it was implemented by B.K Bose for control of the machine drive. Now it is implemented for the grid connected PV inverter, to control the current injected into Grid. It is well suitable for the distribution generation. The adaptive hysteresis band controller changes the bandwidth based on the modulating frequency, supply voltage, input DC voltage and slope of the reference current. Consequently, the controller generates pulses to the inverter. It is advantageous over the conventional hysteresis controller, as the switching frequency is maintained almost constant. Thereby quality of grid current is also improved. It is verified in time domain analysis of simulation using MATLAB.

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.

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.

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.

scholarly journals Design and Analysis of Controller with Selective Harmonic Compensator for Grid Connected PV System

2021 ◽  
Vol 309 ◽  
pp. 01009
Author(s):  
M. Vasu ◽  
D. Lenine ◽  
J. Surya Kumari ◽  
T. Suresh Kumar
Keyword(s):  
Power Quality ◽  
Pv System ◽  
Pv Systems ◽  
Distributed Power Generation ◽  
Quality Issue ◽  
Pv Inverter ◽  
Current Controller ◽  
Simulation Results ◽  
Power Generation Systems

Harmonics produced by distributed power generation systems (DPGS) is a main power quality issue, particularly due to the number of these systems connected to the grid is always increasing. This means that, it is significant to control the harmonics caused by these inverters to limit their contrary effects on the grid power quality. This paper has proposed a new proportional current controller (P Resonant Current Controller) with selective harmonic compensator for grid connected photovoltaic (PV) systems. The proportional resonant current controller (PRCC) can have a significant effect on the quality of the current supplied to the grid by the PV inverter, and hence it is essential that the controller provides a high-quality sinusoidal output with negligible distortion to avoid generating harmonics. The effectiveness of the proposed framework has been verified using simulation results in MATLAB/Simulink.

scholarly journals Suppression of Supply Current Harmonics of 18-Pulse Diode Rectifier by Series Active Power Filter with LC Coupling

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 6060
Author(s):  
Wojciech Sleszynski ◽  
Artur Cichowski ◽  
Piotr Mysiak
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Control Object ◽  
Experimental Tests ◽  
Active Filter ◽  
Current Control ◽  
Additional Line

The reported research aims at improving the quality of three-phase rectifier supply currents. An effective method consists of adding properly formed booster voltages to the fundamental supply voltages using a series active filter. In the proposed solution, the booster voltages are generated by three single-phase systems consisting of inverters, LC filters, and single-phase transformers. The application of LC couplings ensures low emission of disturbances, but may provoke compensator stability problems. The article presents the current control system for a series active filter designed to suppress the dominant harmonics in the supply currents of an 18-pulse rectifier, without interference into fundamental current components. A proportional control is proposed in combination with integral terms implemented in the orthogonal coordinate systems, which synchronically rotate with frequencies equal to those of the harmonic components to be eliminated. The use of complex gains in integral terms allows a simple phase correction of the output signals. A description is given of the method to determine controller parameters based on the mathematical model of the control object. Sample results of experimental tests performed in steady-state and transient conditions are included to illustrate the quality of performance of the series active filter as compared to the results recorded for the rectifier alone, and for the rectifier with additional line reactor. The applied control method of active filter significantly reduces harmonic distortion of the grid current, which is particularly advantageous at nonideal supply voltage and low loads.

An Adaptive Hysteresis Band Controller for Single Phase PV Inverters

2011 ◽  
Vol 354-355 ◽  
pp. 1333-1337
Author(s):  
Yang Xia ◽  
Hai Liang Tao ◽  
Ning Zhang
Keyword(s):  
Single Phase ◽  
Current Control ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Small Range ◽  
Hysteresis Current Control ◽  
Simulink Simulation ◽  
Current Controller ◽  
The One ◽  
Hysteresis Control

Hysteresis current controllers are widely used in PV inverters. The main drawback of conventional hysteresis current control is that the switching frequency is variable, as the hysteresis band is fixed. In this paper an adaptive band hysteresis control algorithm with no derivative calculation is presented. As it will be shown, this algorithm can limit the switching frequency variation within a small range and the algorithm itself is simple and easy to be implemented. The performance of this algorithm, together with the one [10] and conventional hysteresis control has been evaluated by means of simulations performed with PSIM and SIMULINK. Simulation results show the effectiveness of the suggested hysteresis current controller.

scholarly journals An Optimal Current Controller Design for a Grid Connected Inverter to Improve Power Quality and Test Commercial PV Inverters

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Ali Algaddafi ◽  
Saud A. Altuwayjiri ◽  
Oday A. Ahmed ◽  
Ibrahim Daho
Keyword(s):  
Controller Design ◽  
Harmonic Distortion ◽  
Switching Frequency ◽  
Resistive Load ◽  
Lcl Filter ◽  
Fast Fourier Transform Analysis ◽  
Pv Inverter ◽  
Grid Connection ◽  
Current Controller ◽  
Grid Connected Inverter

Grid connected inverters play a crucial role in generating energy to be fed to the grid. A filter is commonly used to suppress the switching frequency harmonics produced by the inverter, this being passive, and either an L- or LCL-filter. The latter is smaller in size compared to the L-filter. But choosing the optimal values of the LCL-filter is challenging due to resonance, which can affect stability. This paper presents a simple inverter controller design with an L-filter. The control topology is simple and applied easily using traditional control theory. Fast Fourier Transform analysis is used to compare different grid connected inverter control topologies. The modelled grid connected inverter with the proposed controller complies with the IEEE-1547 standard, and total harmonic distortion of the output current of the modelled inverter has been just 0.25% with an improved output waveform. Experimental work on a commercial PV inverter is then presented, including the effect of strong and weak grid connection. Inverter effects on the resistive load connected at the point of common coupling are presented. Results show that the voltage and current of resistive load, when the grid is interrupted, are increased, which may cause failure or damage for connecting appliances.

scholarly journals Model Predictive Current Control of Multiphase Motor at Low Carrier Ratio

Electronics ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 591
Author(s):  
Qilan Huang ◽  
Min Kang
Keyword(s):  
Control Method ◽  
Control Process ◽  
Current Control ◽  
Switching Frequency ◽  
Control Voltage ◽  
Multiple Control ◽  
Current Frequency ◽  
Predictive Error ◽  
Current Controller ◽  
Multiphase Motor

Multiphase motors have multiple control planes, and harmonics are decoupled in different planes. Multiphase motors can improve magnetic field distribution, power density and core utilization by injecting certain harmonic currents into the harmonic planes. In the harmonic plane control process, due to the switching frequency of the inverter being limited, the ratio of the switching frequency to the current frequency (the carrier ratio) of the harmonic plane is low, the digital control delay increases, and the inverter output current contains more harmonics, which makes it difficult for the proportional-integral (PI) current controller to effectively control the d-axis and q-axis currents of the harmonic plane and thus unable to track the given values stably. Moreover, the PI current controller is relatively dependent on the motor parameters. For these reasons, a model predictive current control method with predictive error compensation is proposed. Taking a nine-phase induction motor as an example, the control voltage is calculated by the cost function and corrected by the current predictive error, which realizes the current control method at a low carrier ratio. Additionally, the robustness of the control method is analyzed after the parameters of the multiphase motor have large errors. The experimental results show that the proposed method can control the current of the harmonic plane at low carrier ratio, accurately track the harmonic current commands and attain strong robustness for the motor parameters.

MSHE-PWM Control of Modular Multilevel Direct Current Transmission System

2015 ◽  
Vol 9 (1) ◽  
pp. 553-559
Author(s):  
HU Xin-xin ◽  
Chen Chun-lan
Keyword(s):  
Pulse Width Modulation ◽  
Reactive Power ◽  
Balance Control ◽  
Electric Energy ◽  
Access Point ◽  
Experimental Result ◽  
Switching Frequency ◽  
Pwm Control ◽  
Harmonic Elimination

In order to optimize the electric energy quality of HVDC access point, a modular multilevel selective harmonic elimination pulse-width modulation (MSHE-PWM) method is proposed. On the basis of keeping the minimum action frequency of the power device, MSHE-PWM method can meet the requirement for accurately eliminating low-order harmonics in the output PWM waveform. Firstly, establish the basic mathematical model of MMC topology and point out the voltage balance control principle of single modules; then, analyze offline gaining principle and realization way of MSHEPWM switching angle; finally, verify MSHE-PWM control performance on the basis of MMC reactive power compensation experimental prototype. The experimental result shows that the proposed MSHE-PWM method can meet such performance indexes as low switching frequency and no lower-order harmonics, and has verified the feasibility and effectiveness thereof for optimizing the electric energy quality of HVDC access point.

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