Fuzzy Logic Controlled Harmonic Suppressor in Cascaded Multilevel Inverter

2016 ◽  
Vol 7 (2) ◽  
pp. 303
Author(s):  
Y. Lalitha Kameswari ◽  
O. Chandra Sekhar
Keyword(s):  
Fuzzy Logic ◽  
Power Quality ◽  
Fuzzy Inference ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Inference System ◽  
Logic Control ◽  
Harmonic Reduction ◽  
Harmonic Elimination ◽  
Cascaded Multilevel Inverter

<p>This paper presents an investigation of seven level cascaded H-bridge (CHB) inverter in power system for compensation of harmonics.For power quality  control a Fuzzy Logic Control (FLC)  giving comparatively better harmonic reduction than the conventional controllers. Harmonic distortion is the most important power quality problem stirring in multilevel inverter, the harmonics can be eliminated by an optimal selection of switching angles. A hybrid evaluation technique evaluates the obtained optimal switching angles that are attained from the fuzzy inference system as well as neural network. The proposed method will be implemented in MATLAB working platform and the harmonic elimination performance will be evaluated.</p>

scholarly journals Harmonic Elimination of Cascaded Multilevel Inverter using Metaheuristic Optimization Methods

2018 ◽  
Vol 7 (4.15) ◽  
pp. 272 ◽  
Author(s):  
Srikanta Kumar Dash ◽  
Byamakesh Nayak ◽  
Jiban Ballav Sahu ◽  
Rojalin Rout
Keyword(s):  
Harmonic Distortion ◽  
Optimization Methods ◽  
Optimization Method ◽  
Multilevel Inverter ◽  
Computational Time ◽  
Local Minima ◽  
Metaheuristic Optimization ◽  
Harmonic Elimination ◽  
Whale Optimization ◽  
Cascaded Multilevel Inverter

The harmonic elimination of multilevel inverters is a complicated task that includes nonlinear transcendental equations. With the increase in the level of the multilevel inverter, the no of variables of the equation also increases which makes the problem more complicated. Metaheuristic optimization algorithms play an important role in finding out optimum switching angles required for elimination of harmonics in a lesser computational time avoiding multiple local minima. This paper deals with the harmonic elimination of cascaded multilevel inverter using whale optimization algorithm. The whale optimization method has the ability to escape local minima and it takes less time of computation of results. Results are verified theoretically by taking an example of a 15-level cascaded H-bridge inverter fed from equal d.c.sources. The above scheme well minimizes lower order harmonics and gives better output voltage and a low total harmonic distortion.  

scholarly journals Simulation of single phase photovoltaic system based on fuzzy logic control with multilevel inverter

2019 ◽  
Vol 107 ◽  
pp. 02003 ◽  
Author(s):  
Ezzaldden Raweh ◽  
Wei Pi ◽  
Omar Busati ◽  
Abdul Rehman ◽  
Saif Mubbarak ◽  
...  
Keyword(s):  
Fuzzy Logic ◽  
Power Systems ◽  
Fuzzy Logic Control ◽  
Single Phase ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Optimal Operation ◽  
Multilevel Inverter ◽  
Photovoltaic System ◽  
Logic Control

To control the solar power, reliability and stability are two main challenges. In addition, the total harmonic distortion (THD) must be within limits for optimal operation. In an inverter, the harmonics are produced during the conversion of DC power to AC power, which will affect the power electronic devices. Therefore, to overcome such challenges in high voltage and high power systems multilevel inverter (MLI) topology is more useful. Such type of inverters uses various DC voltage levels to generate the stepped AC at its output, approaching the sinusoidal shape. The cascaded H-bridge, capacitor-clamped, and diode-clamped are the most commonly used multilevel inverters topologies. For photovoltaic (PV) usage, cascaded H-bridge (CHB) MLI is more adaptive among the three topologies, where for each H-bridge unit; each PV model behaves as an isolated DC source. This paper specifically focused on the simulation of PV power as a source to the system and displayed the potential of a single-phase 11-level CHB inverter. For switching the IGBT devices, sinusoidal pulse width modulation (SPWM) is applied. Moreover, the fuzzy logic control (FLC) is introduced to improve the power quality. FLC reduce the THD via finding the appropriate set of IGBT switch signals. To show the improvement in the operation and reduction in the complex harmony signal effects of the CHB 11-level inverter, the proposed system is designed in Matlab/Simulink software. Finally, the results show that the dynamic behavior of the FLC is much better than the traditional proportional integral derivative (PID) controller.

scholarly journals A New Method of Selective Harmonic Elimination PWM for H-Bridge Cascaded Multilevel Inverter

2019 ◽  
Vol 9 (1) ◽  
pp. 6168-6175
Keyword(s):  
Degrees Of Freedom ◽  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Voltage Range ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Cascaded Multilevel Inverter ◽  
Operating Points

The quality of power of the cascaded H-bridge multilevel inverter is affected due to harmonics. In this paper, a Selective Harmonic Elimination Pulse Width Modulation (SHE-PWM) method including controllable DC link voltage is introduced for the multilevel inverter. Novel mathematical modeling of SHE-PWM is established concerning the DC link voltage. Compared to ordinary selective harmonic elimination, the proposed method has an increased number of degrees of freedom because of its variable DC link voltage. On the other hand, the selective harmonic elimination utilizes constant DC link voltage. In the proposed scheme, the nonlinear equations are solved only once in the entire voltage range. As a result, the computational burden will decrease. Also, the Total Harmonic Distortion (THD) of the output voltage remains constant for various values of the operating points. The simulation is performed using Matlab Simulink and the comparison is performed with the conventional PWM method. It is intended that the proposed SHE-PWM based cascaded H-bridge multilevel inverter provides better performance in terms of lower-order harmonics and less THD compares to conventional PWM method.

scholarly journals ANFIS control of a shunt active filter based with a five-level NPC inverter to improve power quality

2021 ◽  
Vol 11 (3) ◽  
pp. 1886
Author(s):  
Mahmoud Mostefa Tounsi ◽  
Ahmed Allali ◽  
Houari Merabet Boulouiha ◽  
Mouloud Denaï
Keyword(s):  
Power Quality ◽  
Fuzzy Inference ◽  
Fuzzy Controller ◽  
Harmonic Distortion ◽  
Active Filter ◽  
Nonlinear Loads ◽  
Inference System ◽  
Shunt Active Filter ◽  
Neuro Fuzzy

This paper addresses the problem of power quality, and the degradation of the current waveform in the distribution network which results directly from the proliferation of the nonlinear loads. We propose to use a five-level neutral point clamped (NPC) inverter topology for the implementation of the shunt active filter (SAPF). The aim of the SAPF is to inject harmonic currents in phase opposition at the connection point. The identification of harmonics is based on the pq method. A neuro-fuzzy controller based on ANFIS (adaptive neuro fuzzy inference system) is designed for the SAPF. The simulation study is carried out using MATLAB/Simulink and the results show a significant improvement in the quality of energy and a reduction in total harmonic distortion (THD) in accordance with IEC standard, IEEE-519, IEC 61000, EN 50160.

scholarly journals Analysis of Proportional Integral Controller and Fuzzy Logic Controller for Single Phase Induction Motor

2020 ◽  
Vol 9 (10) ◽  
pp. 93-100
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Logic Controller ◽  
Pulse Width Modulation ◽  
Fuzzy Inference ◽  
Supply System ◽  
Inference System ◽  
Harmonic Elimination ◽  
Non Linear Load ◽  
The Times ◽  
Takagi Sugeno

Nowadays problems are occurring due to power quality issues which causes major impression in power system. Most of the times problem is of harmonics in the supply system. It occurs due to Non-Linear Load and it could be rectified by using filters, controllers and artificial intelligence. In this paper, the Fuzzy logic controller is designed using Takagi- Sugeno fuzzy inference system to eliminate harmonics and uncertainty in the supply system thereby improving the response of whole system. The Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) control scheme is used to generate the necessary pulses to eliminate the lower order harmonics. The results for both fuzzy logic controller (FLC) and PI Controller are compared, and the simulation is designed in MATLAB Simulink.

scholarly journals An Innovative Fuzzy Based Power Quality Assessment Considering Short Circuit Level

2019 ◽  
Vol 8 (4) ◽  
pp. 10249-10252
Keyword(s):  
Power Quality ◽  
Quality Index ◽  
Quality Evaluation ◽  
Fuzzy Inference ◽  
Short Circuit ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Quality Indices ◽  
Inference System ◽  
Pollution Factor

power quality evaluation is highly essential for modern power system to maintain proper accuracy for responsive equipment. There are various power quality indices which evaluates the power quality but it is highly crucial for combining all the indices into a single value which can evaluates the power quality successfully. Considering representative quality factor(RQPF), detailed pollution factor(DPF),total harmonic distortion(THD) and short circuit level(SCL)an untraditional power quality index can be evaluated. Fuzzy inference system has been implemented for doing the incorporation of different power quality indices. In this paper THD module is formed by the union of total harmonic distortion voltage(THDV) and total harmonic distortion current(THDI ) and THDSCL module is formed by the fusion of THD and SCL. The innovative THDSCL has better significance for measuring power quality Index

scholarly journals WTHD minimisation in hybrid multilevel inverter using biogeographical based optimisation

2014 ◽  
Vol 63 (2) ◽  
pp. 187-196
Author(s):  
R. Kavitha ◽  
Rani Thottungal
Keyword(s):  
Lower Order ◽  
Harmonic Distortion ◽  
Transcendental Equation ◽  
Multilevel Inverter ◽  
Total Harmonic Distortion ◽  
Harmonic Elimination ◽  
Selective Harmonic Elimination ◽  
Simulation Results ◽  
Cascaded Multilevel Inverter ◽  
Inverter Topology

Abstract Harmonic minimisation in hybrid cascaded multilevel inverter involves complex nonlinear transcendental equation with multiple solutions. Hybrid cascaded multilevel can be implemented using reduced switch count when compared to traditional cascaded multilevel inverter topology. In this paper Biogeographical Based Optimisation (BBO) technique is applied to Hybrid multilevel inverter to determine the optimum switching angles with weighted total harmonic distortion (WTHD) as the objective function. Optimisation based on WTHD combines the advantage of both OMTHD (Optimal Minimisation of Total Harmonic Distortion) and SHE (Selective Harmonic Elimination) PWM. WTHD optimisation has the benefit of eliminating the specific lower order harmonics as in SHEPWM and minimisation of THD as in OMTHD. The simulation and experimental results for a 7 level multilevel inverter were presented. The results indicate that WTHD optimization provides both elimination of lower order harmonics and minimisation of Total Harmonic Distortion when compared to conventional OMTHD and SHE PWM. Experimental prototype of a seven level hybrid cascaded multilevel inverter is implemented to verify the simulation results.

Heading Control of a RC Helicopter by Fuzzy Logic

2013 ◽  
Vol 278-280 ◽  
pp. 1466-1472
Author(s):  
Anan Suebsomran
Keyword(s):  
Mathematical Model ◽  
Fuzzy Logic ◽  
Fuzzy System ◽  
Fuzzy Logic Control ◽  
Fuzzy Inference ◽  
Feedback Signal ◽  
Inference System ◽  
Control Approach ◽  
Logic Control ◽  
Heading Control

This research aims to control the heading of a small RC helicopter based on fuzzy logic control approach. Control of such a vehicle is normally nonlinear system. To be linear system, the mathematical model of this system would be archived and its parameters. From such difficulty of obtaining mathematical model and parameters, thus in this propose we develop the heading control of a small RC helicopter by using fuzzy logic control, which is overcome the unmodeling of such vehicle, for objective of developed control system. The performance of system is specified to control in time domain design specification. The rule based construction for designing the fuzzy system is related to input and output membership function for inference fuzzy system. Second order response time is specified, and error e and delta error (e) are conditionally assigned for constructing the rule of fuzzy inference system using Mamdani reasoning scheme. Defuzzification method applies the center of gravity (COG) method to computation the output to compensate the error and delta error signal. Finally the result of experiment reveals that the tracking of control of desire heading command and feedback signal is archived via the desired control performance in heading control of a small RC helicopter system.

Harmonic Elimination in a Solar Powered Cascaded Multilevel Inverter Using Genetic Algorithm and Differential Evolution Optimization Techniques

2015 ◽  
Author(s):  
Shimi Sudha Letha ◽  
Tilak Thakur ◽  
Jagdish Kumar
Keyword(s):  
Genetic Algorithm ◽  
Differential Evolution ◽  
Harmonic Distortion ◽  
Optimization Techniques ◽  
Multilevel Inverter ◽  
Photovoltaic System ◽  
Harmonic Elimination ◽  
Solar Powered ◽  
Solar Photovoltaic System ◽  
Cascaded Multilevel Inverter

In the present work the authors propose a solar powered cascaded multilevel inverter which can be integrated with the grid. To connect the solar photovoltaic system to the grid a dc to ac conversion of power is required which is made possible using a multilevel inverter, but the power electronic switches introduces harmonics during the switching process. Thus the investigators propose a selective harmonic elimination technique using Genetic Algorithm and Differential Evolution Optimization Techniques. The performance comparisons of the proposed techniques will be carried out by comparing the Total Harmonic Distortion (THD) and the selective harmonics such as 5th, 7th,11th and 13th using FFT analysis in MATLAB/SIMULINK. The authors anticipate that the comparative analysis presented in this work will be very useful for further research.

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