scholarly journals Performance analysis of real-time PSO tuned PI controller for regulating voltage and frequency in an AC microgrid

2021 ◽  
Vol 11 (2) ◽  
pp. 1068
Author(s):  
Umbrin Sultana ◽  
Sajid Hussain Qazi ◽  
Nadia Rasheed ◽  
M. W. Mustafa
Keyword(s):  
Harmonic Distortion ◽  
Pi Controller ◽  
Load Variations ◽  
Pi Regulator ◽  
Tuning Method ◽  
Synchronous Reference Frame ◽  
Utility System ◽  
Self Tuning ◽  
Ac Microgrid

<p>In this study, a control strategy based on the self-tuning method and synchronous reference frame (SRF) with PI regulator is proposed to achieve optimum quality of power in an autonomous micro grid (MG). The MGS is based on multiple distributed generation (DG) connected with 120 kV power grid. The proposed system is first simulated with fixed gain values for PI controller which are not optimal for sudden changes in the system i.e. transition of MG to islanding mode, load variations. So, the particle swarm optimization (PSO) has been utilized for tuning of PI controller parameters which ensure flexible performance and superior quality of power. The principal parameters considered in this study are, regulation of voltage and frequency, steady-state and dynamic response and harmonic distortion, mainly when microgrid is islanded. The performance of PI and PI-PSO is compared in this study by simulating AC microgrid in the MATLAB/Simulink environment. Summarized results of the system are provided to authenticate viability of proposed arrangement. The proposed controller performs intelligently while regulating voltage and frequency of the MGS and utility system.</p><div> </div>

scholarly journals An Intelligent PI Controller-Based Hybrid Series Active Power Filter for Power Quality Improvement

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Arjun Baliyan ◽  
Majid Jamil ◽  
M. Rizwan ◽  
Ibrahim Alsaidan ◽  
Muhannad Alaraj
Keyword(s):  
Simulation Analysis ◽  
Harmonic Distortion ◽  
Active Power Filter ◽  
Pi Controller ◽  
Active Power ◽  
Nonlinear Loads ◽  
Harmonic Compensation ◽  
Power Filter ◽  
Synchronous Reference Frame ◽  
Power Quality Improvement

The quality of power that is degrading day by day is an important issue for all the consumers. The important factor for this is harmonics in the voltage and current waveforms which can be resolved by the use of hybrid series active power filter. The combination consists of a series active power filter and a shunt passive filter connected in parallel to the load. The method used in this paper is for the purpose of achieving good harmonic compensation and reduced total harmonic distortion for various types of nonlinear loads as per the standards of IEEE 519. The proposed HSAPF technique uses the synchronous reference frame method for generating the compensating signal with an intelligent PI controller that uses particle swarm optimization (PSO) technique to obtain the required gain values needed to improve the steady state response of the system. The concept of vigorous HSAPF has been authenticated through MATLAB simulation analysis, and the results obtained validate the accuracy of the method for the different load conditions.

scholarly journals Design and Control of a Grid-connected Seven Level Inverter for Photovoltaic Applications

2019 ◽  
Vol 3 (1) ◽  
pp. 21-27
Author(s):  
Francis Mulolani ◽  
Francis Kafata ◽  
Esau Zulu
Keyword(s):  
Closed Loop ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Current Control ◽  
International Standards ◽  
Control Technique ◽  
Loop Current ◽  
Grid Synchronization ◽  
Synchronous Reference Frame

This paper presents the design and closed-loop current control of a grid connected seven-level, 3-phase diode-clamped multilevel inverter for Photovoltaic (PV) applications. The proposed closed loop current control technique is based on the voltage-oriented proportional integral (PI) controller theory. The modulation technique used is level-shifted-carrier sinusoidal pulse width modulation (SPWM). The gain values of PI controller were selected to achieve good current quality and dynamic response. Grid synchronization was achieved by using a synchronous-reference frame phase-locked loop (SRF-PLL). Matlab/Simulink was used for the control system design and simulation. The simulation results show that a 1.34% total harmonic distortion (THD) of the output current was achieved which is within the allowable current distortion limits by international standards. The stability of the system was analyzed using pole-zero mapping and root locus.

Application of Fuzzy-PI Controller in the Asynchronous Motor

2014 ◽  
Vol 1070-1072 ◽  
pp. 1210-1215
Author(s):  
Guang Zhong Li
Keyword(s):  
Asynchronous Motor ◽  
Pi Controller ◽  
Control Effect ◽  
Excitation Current ◽  
Pi Regulator ◽  
Large Fluctuations ◽  
Speed Regulator ◽  
Self Tuning ◽  
Fuzzy Pi Controller ◽  
Control Modules

This paper proposes an induction motor variable frequency speed control system based on fuzzy-PI self-tuning. The system includes coordinate transformation modules, vector control modules, space vector pulse width modules, fuzzy-PI self-tuning speed regulator, excitation current and torque current PI regulator. Because the speed regulator controlled by the fuzzy-PI self-tuning has better control effect than traditional PI. The performance can be reflected by the shorter response time, smaller overshoot. In addition, when the load torque changes, the electromagnetic torque changes more smoothly and does not have large fluctuations.

Voltage Profile Enhancement using fuzzy self-tuned STATCOM

2018 ◽  
Vol 1 (1) ◽  
pp. 38-35
Author(s):  
Dr. Abdelelah K. Mahmood ◽  
Dr. Inaam A. Ali ◽  
Ayad A. ALGailany
Keyword(s):  
Transmission Lines ◽  
Industrial Development ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Electrical Energy ◽  
Pi Controller ◽  
New Technique ◽  
Voltage Profile ◽  
Self Tuning ◽  
A New Technique

Recently, the demand on electrical energy is growing day by day as a result of rapid industrial development so that it is making the transmission lines more exhausted and affected especially the voltage stability. In order to overcome these problems, a FACTs device STATCOM of 12 pulse two levels is used to increase the capability of transmission lines and improving the voltage profile of the system. In this work, a new technique of fuzzy self-tuning is used in STATCOM's controller where the parameters of PI controller tuned online that is lead to improve the voltage profile when the power system exposed to the abnormal condition. The simulation results of STATCOM with tuned fuzzy-PI controller show an enhancement in voltage profile under many disturbances as compared with the system used STATCOM without this new technique. The results show a voltage profile using fuzzy-PI less over shoot and reach to steady state efficient than conventional PI. The results of total harmonic distortion (THD) show low values due to application of the Sinusoidal Pulse Width Modulation (SPWM) technique and assuming the loads are linear.

scholarly journals PV-STATCOM in Photovoltaic Systems under Variable Solar Radiation and Variable Unbalanced Nonlinear Loads

2021 ◽  
pp. 36-48
Author(s):  
Youssef Ait El Kadi ◽  
◽  
Fatima Zahra Baghli ◽  
Yassine Lakhal
Keyword(s):  
Harmonic Distortion ◽  
Current Control ◽  
Nonlinear Loads ◽  
Nonlinear Load ◽  
Passive Components ◽  
Load Variations ◽  
Instantaneous Power ◽  
Zero Sequence ◽  
Static Compensator

The paper focuses on an efficient method to compensate the harmonics and zero-sequence component caused by the variable unbalanced nonlinear loads. The studied compensator is based on the conventional Static Compensator (STATCOM) which is supplied by a photovoltaic generator rather than the storage passive components. That constitutes a Photovoltaic Static Compensator (PV-STATCOM). In addition to the active power production, this PV-STATCOM will improve the quality of the electric grid highly disturbed without any additional devices and costs. The used control strategy is based on the instantaneous power method and current control. The obtained results show the benefits of the photovoltaic active filter compensator to improve the energy quality. Specially, the Total Harmonic Distortion (THD) is decreased from 28.80 % to 2.03 %. The zero-sequence component of the load currents is reduced from 31.50 % to 4.26 %. The results prove also a high stabilization and limitation of the harmful repercussions of the compensator on the photovoltaic station and an automatic adapting to the solar variable radiation and to the unbalanced nonlinear load variations.

scholarly journals Self-Tuning Two Degree-of-Freedom Proportional–Integral Control System Based on Reinforcement Learning for a Multiple-Input Multiple-Output Industrial Process That Suffers from Spatial Input Coupling

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 487
Author(s):  
Fumitake Fujii ◽  
Akinori Kaneishi ◽  
Takafumi Nii ◽  
Ryu’ichiro Maenishi ◽  
Soma Tanaka
Keyword(s):  
Control System ◽  
Reinforcement Learning ◽  
Pid Control ◽  
Multiple Input Multiple Output ◽  
Industrial Process ◽  
Pi Controller ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Self Tuning ◽  
Two Degree Of Freedom

Proportional–integral–derivative (PID) control remains the primary choice for industrial process control problems. However, owing to the increased complexity and precision requirement of current industrial processes, a conventional PID controller may provide only unsatisfactory performance, or the determination of PID gains may become quite difficult. To address these issues, studies have suggested the use of reinforcement learning in combination with PID control laws. The present study aims to extend this idea to the control of a multiple-input multiple-output (MIMO) process that suffers from both physical coupling between inputs and a long input/output lag. We specifically target a thin film production process as an example of such a MIMO process and propose a self-tuning two-degree-of-freedom PI controller for the film thickness control problem. Theoretically, the self-tuning functionality of the proposed control system is based on the actor-critic reinforcement learning algorithm. We also propose a method to compensate for the input coupling. Numerical simulations are conducted under several likely scenarios to demonstrate the enhanced control performance relative to that of a conventional static gain PI controller.

Study of the Influence of Control System Parameters on the Quality of the Input Current of a Three-Phase Power Factor Corrector

2021 ◽  
Vol 2 (2) ◽  
pp. 29-35
Author(s):  
Dmitry A. Sorokin ◽  
◽  
Sergey I. Volskiy ◽  
Jaroslav Dragoun ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Power Factor ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Input Current ◽  
System Operation ◽  
Error Amplifier ◽  
Three Phase ◽  
Power Factor Corrector

The paper suggests a control system of a three-phase power factor corrector. The study of the control system operation is carried out and the expressions for calculating the permissible values of error amplifier factors are obtained. The influence of the error amplifier parameters on phase current quality is investigated. The dependence of total harmonic distortion input current on a combination of error amplifier parameters is obtained at a given value of power factor. The conditions under which the total harmonic distortion input current has the minimum value are found out. This article is of interest to power electronics engineers, who are aimed at developing a three-phase power factor corrector.

scholarly journals Power quality of dual two-level inverter fed open end winding induction motor

2020 ◽  
Vol 18 (2) ◽  
pp. 688
Author(s):  
Hayder Ali Mohamed ◽  
Hanan Mikhael D. Habbi
Keyword(s):  
Induction Motor ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Current Signal ◽  
Space Vector Pwm ◽  
Dc Voltage ◽  
Common Mode Voltage ◽  
Voltage Quality ◽  
Open End Winding

<p><span>This paper presents the minimization of the total harmonic distortion (THD) of the current signal for open-end winding induction motor by using dual two-level inverter. In order to obtain a good value of THD, the space vector PWM has been used for switching the dual two-level inverter to improve the output voltage quality, gets a low common mode voltage, reduce the execution time, and to save the memory capacity. The proposed scheme uses two different DC voltage source with two two level inverter in order of minimizing the number of components. As well as it is an important to utilize the energy which increases the application of dual inverter in microgrids. All simulation results are obtained using Matlab/Simulink. </span></p>

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