Comparison of Cascaded H-Bridge Multilevel Inverter connected to grid using PI and fuzzy logic controllers (original) (raw)
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IJEER , 2023
Power quality is the primary issue to be taken into consideration in modern electrical systems, particularly on the distribution side, to protect sensitive loads. Long-term uses can never run out of renewable resources. Connecting STATCOM at the distribution side enhances the power factor by improving the quality of the current waveform. The reactive power range that needs adjustment by utilising PV arrays on the STATCOM's DC side. Increases due to the large rise in terms of the PV power plants' size and capacity. Cascaded H Bridge multilevel topologies can increase the flexibility and effectiveness of PV modules. The suggested approach in this paper gives outcome of reduced peak over shoot, rise time, settling time, steady state error, percentage of ripples and total harmonic distortion which improves the power quality. PV system with cascaded H bridge multilevel inverters STATCOM for harmonic suppression and to make reactive powerless. To produce modulation indices for H Bridge switching, synchronised reference frame theory is modified. H bridges' average DC voltage is managed by a PI controller, and controller gains are obtained using fuzzy, PSO, and the trial-and-error approach. To confirm the viability of the suggested approach, simulation results using MATLAB/SIMULINK are shown. The experimental setup of proposed method is carried out to validate the inverter response.
Journal of Electrical Systems and Information Technology, 2016
Multilevel inverters are becoming more popular in the power conversion systems for high power and power quality demanding applications. The MATLAB based simulation on SIMULINK platform is presented for the Single Phase five level cascaded H-bridge Multilevel Inverter (CHB-MLI) topology with less number of switches and with different control schemes and Sinusoidal Pulse Width Modulation (SPWM) schemes. A detailed comparison of various control schemes is presented in this paper with reference to Total Harmonic Distortion (THD) in the output voltage and utilization factor of the power devices. It is observed that among all the control schemes, the THD is minimum in the Sinusoidal Pulse Width Modulation-Phase Disposition (SPWM-PD) scheme with variable carrier wave magnitude.
DESIGN AND IMPLEMENTATION OF A FUZZY LOGIC CONTROLLER FOR MULTILEVEL INVERTER TOPOLOGY.
IJRCAR, 2013
It has been found that by using Fuzzy Logic Control scheme can greatly reduce harmonics distortions generated by the Multilevel Inverter. Harmonics reduction is the main consideration in the inverter circuit. The performance of the multilevel inverter increased by the reduction of THD. Multilevel inverters widely accepted for high-power high-voltage applications. In this research work, a new topology with a reversing-voltage component is proposed to improve the multilevel performance. This topology requires fewer components compared to existing inverters (particularly in higher levels) and requires fewer carrier signals and gate drives. The output voltage is regulated at a desired level in the face of source voltage disturbances or load disturbances using fuzzy logic control scheme. Both PI control scheme and fuzzy logic control scheme are analysed by using Matlab simulation. The inverter is proposed to deliver 40V / 300W. The source voltage variation can be anywhere between 24 volts and 50 volts DC. A prototype of the seven-level proposed topology is built and tested to show the performance of the inverter by experimental results. The percentage THD values of the multilevel inverter was analysed by using PI control scheme and Fuzzy Logic Control scheme. In this research work the current harmonics distortion was reduced by using Fuzzy Logic Control scheme, there was reduction of current THD 2.49 % , which increases the performance of the multilevel inverter.
Multilevel inverter is a promising inverter topology for high voltage and high power applications. This inverter synthesizes several different levels of DC voltages to produce a stepped AC output that approaches the pure sine waveform. The three different topologies, diode-clamped inverter, capacitor-clamped inverter and cascaded h-bridge multilevel inverter are widely used in these multilevel inverters. Among the three topologies, cascaded hbridge multilevel inverter is more suitable for photovoltaic applications since each PV array can act as a separate dc source for each h-bridge module. This research especially focus on photovoltaic power source as input to the system and shows the potential of a Single Phase Cascaded H-bridge Eleven level inverter governed by the fuzzy logic controller to improve the power quality by reducing the total harmonic distortion at the output voltage. Hence the efficiency of the system will be improved. Simulation using MATLAB/SIMULINK has been done to verify the performance of cascaded h-bridge eleven level inverter using sinusoidal pulse width modulation technique. The simulated output shows very favorable result.
Design a Simulation of Multilevel Inverter for Reduction of Harmonics for Grid Connected PV System
International Journal for Research in Applied Science & Engineering Technology (IJRASET), 2022
The existing topologies, Multilevel inverters acts as a promising solution for medium voltage, high power applications due to their modularity and reduced voltage stress across the power switches. They are becoming popular due to reduced voltage stress of the power switches and low THD. Among the different multilevel configurations, H bridge multi-level inverter (HB-MLI) is found to be attractive for grid connected PV applications. H Bridge Multilevel Inverters (HB-MLI) are being considered as the best choice for grid connected Photovoltaic (PV) systems since they require several sources on the DC side. By means of high-quality output with less harmonic distortion is obtained compared to a two-level inverter. Different levels of output viz. three level is examined and conclusions are drawn mainly based on the number of switches and Total Harmonic Distortion (THD). The main advantages of the multilevel inverter are that the regulation of the DC buses is simple. More number of levels results in reduced THD and nearly sinusoidal output. Simulation is performed using Matlab/Simulink.
Harmonic Minimized of Cascaded H-Bridge Multilevel Inverter Using PV system
volume 1, issue 1, Feb-2014, IJRST
This paper focusing on the harmonic minimization of 11-level cascaded H-multilevel inverter using PV systems with a Pulse Width Modulation (PWM) control scheme. The photo-voltaic arrays are connected to eleven level multilevel inverter through DC-DC boost converter. By implementing maximum power point tracking (P&O) algorithm are producing power from PV array. The DC power from the PV array is boosted by using the DC-DC boost converter. Which is controlled by PI controller. This methodology of simulation has been carried out and verified through the MAT LAB/SIMULINK to achieve a mitigated Total Harmonic Distortion (THD).
International Journal of Power Electronics and Drive System (IJPEDS) , 2019
The world community relied heavily on fossils energies but just after the big oil crisis the use of renewable energy has greatly increased and has become the main interest of many countries for its many advantages such as: minimal impact on the environment, renewable generators requiring less maintenance than traditional ones and it has also a great impact on economy. It is easy to get charmed by the advantages of using the renewable resources but we must also be aware of their disadvantages. One of the major disadvantages is that the renewable energy resources are intermittent and thus they have led scientists to develop new semiconductor power converters among which are the multilevel inverter. In this paper a new smart multi-level inverter is proposed so as to increase its levels according to the user's needs and also to avoid the impact of shades and the intermittence on photovoltaic panels. We also propose a modification on the multicarrier aiming to reduce the harmonics. This modification introduces a sinusoidal wave compared with trapezoidal multi-carrier to generate the pulses. In order to obtain the line voltages and the total harmonic distortions (THD) MATLAB/SIMULINK is used.
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/comparative-analysis-of-cascaded-h-bridge-multilevel-inverters-in-reducing-harmonic-distortion-by-eppwm-and-pdpwm-techniques https://www.ijert.org/research/comparative-analysis-of-cascaded-h-bridge-multilevel-inverters-in-reducing-harmonic-distortion-by-eppwm-and-pdpwm-techniques-IJERTV10IS060179.pdf Multilevel inverter (MLI) technologies are suitable for conversion in renewable sources and high-power industrial applications due to their many advantages such as low power dissipation on power switches, low harmonic contents, high power rating and high efficiency that can be achieved without using transformer. Multi-level inverter is a DC to AC power convertor which is implemented using power electronic semiconductor switches like IGBT or MOSFET. The proposed system uses Equal Phase (EP) and Sinusoidal pulse width modulation (SPWM) method for generating gating/firing signal in the multilevel inverter to convert DC voltage from battery storage to supply AC loads. In the EP method, the effectiveness of eliminating low-order harmonics in the inverter output voltage is studied and compared to that of the sinusoidal PWM method. In SPWM, Phase Disposition (PD) PWM method is used to control the output of multilevel inverter. The distortion of the output voltage decreases and rms output voltage increases as the number of level increases. This paper presents the simulation and comparative analysis of the single phase three, five, seven and eleven level inverters. All the topologies are modelled using MATLAB/Simulink and the results are validated and compared.
International Journal of Engineering Research and Technology (IJERT), 2019
https://www.ijert.org/Design-and-Implementation-of-Advanced-Control-Scheme-of-Cascaded-Multilevel-Inverter-for-Power-Quality-Improvement https://www.ijert.org/research/design-and-implementation-of-advanced-control-scheme-of-cascaded-multilevel-inverter-for-power-quality-improvement-IJERTCONV7IS02049.pdf This paper discusses the use of a cascaded multilevel converter for flexible power conditioning in smart-grid applications.The main feature of the proposed scheme is the use of independent dc links with reduced voltages, which makes such a topology an ideal candidate for medium-and high-power applications with increased reliability.The advantages of CHB inverter are low harmonic distortion, reduced number of switches and suppression of switching losses.CHB converters are being considered for the increasing number of applications due to their high power capability associated with low output harmonics and low commutation losses.The modified inverter can produce a better sinusoidal waveform by increasing the number of output voltage levels.Byserial connection of two modified H-bridge modules,it is possible to produce 9 output voltage levels including zero.From the results,the proposed inverter provide higher output quality with relatively lower power loss as compared to other conventional inverters with the same output quality.
THD Analysis in Cascaded H-Bridge Multilevel Inverter
GRD Journals, 2019
This paper proposes a new fuzzy logic controller for seven-level hybrid cascaded H-bridge inverter. The inverter is used for on-grid application of PV a system. Here a Sinusoidal pulse width-modulation (SPWM) technique is applied for obtaining carrier signals. Multi-Level Inverter technology have been developed in the area of high-power medium-voltage energy scheme. It is because of their advantages such as devices of high dv/dt rating, higher switching frequency, unlimited power processing, shape of output waveform and desired level of output voltage, current and frequency adjustment. This topology can be used there by enabling the scheme to reduce the Total Harmonic Distortion (THD) for high voltage applications. The Maximum Power Point tracking algorithm is also used for extracting maximum power from the PV array connected to each DC link voltage level. The Maximum Power Point tracking algorithm is solved by Perturb and Observer method. It has high performance with low Total Harmonic Distortion and reduced by this control strategy.