THD Analysis in Cascaded H-Bridge Multilevel Inverter (original) (raw)
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IRJET, 2022
This paper presents a comparative study of seven-level and eleven-level Cascaded H-Bridge (CHB) inverter in power system for harmonic compensation. Integrating the photovoltaic (PV) system and grid requires power electronic converters. Inverters convert DC electricity produced by the PV system into AC electricity for loads. Multilevel inverters (MLI) replaces conventional inverters and are widely implemented in high-voltage and high-power applications due to the improved conversion efficiency, reduced stress on the switches etc... Total Harmonic Distortion (THD) is the most important power quality issue in multilevel inverters and can be reduced by SPWM technique and further reduced by using a controller that can able to withstand the static and dynamic conditions. A rule-based fuzzy logic controller design is described and produces better harmonic reduction than a PI controller. A grid connected inverter model using SPWM technique with PI controller and fuzzy logic controller will be implemented in MATLAB and the harmonic distortion analysis is evaluated at different states.
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.
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.
Design and Analysis of a PV-Based Cascaded H-Bridge Seven-Level Inverter
Advances in Electrical Control and Signal Systems, 2020
With the advancement of technology, multilevel inverters are preferred over the two-level inverters due to its numerous advantages such as minimized total harmonic distortion, better sinusoidal output voltage and lesser electromagnetic interferences. High-power industrial applications also make use of multilevel inverters for obtaining better output. Two-level inverters are completely obsolete nowadays. Keeping in view this, the focus is on to design, simulate and analyse a seven-level inverter in this research work. Also, renewable energy sources such as solar, biomass, hydro and wind can be naturally replenished during a life cycle. Uses of these renewable energy sources are more beneficial. Here, in this research work, photovoltaic source is being used as the input to the cascaded H-bridge seven-level inverter rather than direct current source. The designed seven-level inverter results in lesser harmonics as well as lesser total harmonic distortion and is suitable for induction motor drive applications. Keywords Multilevel inverter (MLI) • Cascaded H-bridge (CHB) • Renewable energy sources (RESs) • Photovoltaic (PV) • Total harmonic distortion (THD) • Harmonics
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).
The harvesting of renewable solar energy is on demand due to the rising need of electricity in the current global scenario. PV generation system which is connected with Cascaded H-Bridge Multilevel Inverters. Many companies are striving to improve the performance of this system since electrical has become a very precious thing hence this paper proposes an idea as a solution to that by improving the system performance by reducing its THD and harmonics.
COMPARATIVE ANALYSIS OF CASCADED MULTILEVEL INVERTER INTEGRATION WITH PV SYSTEM
IJRAR
In the solar PV system the output power changes with the climatic conditions (temperature and solar irradiation). To extract the output power from PV array Maximum Power Point Tracking (MPPT) is used. As the produced voltage from PV arrays is not fulfil the network rating. Therefore, DC-DC boost converters are used to boost the voltage trough Perturbation & Observation (P&O), MPPT controller technique. The boosted output from DC-DC boost converter is DC, but for commercial purpose to need it convert to AC because most of loads are AC in industry and commercial use. In this manuscript present comparative analysis between PV based 7-level cascaded H-bridge multilevel inverter (CHB-MLI) and PV based 9-level CHB MLI. CHB MLI is more beneficial with regard to low dv/dt stress, less electromagnetic interference (EMI) and less total harmonic distortion (THD). CHB-MLI is more suitable with solar PV system and the designing of 7 levels CHB-MLI and 9 levels CHB-MLI is done. GA algorithm is used to obtain the optimal switching angles of CHB MLI. The analysis of results shows that when the level of multilevel inverter increased the % THD get decreased.
Implementation of Solar Powered H-Bridge Cascaded Multilevel Inverter
This paper presents a single phase 7 level (which includes 3 bridges) cascaded multi level inverter. Each bridge is connected to a solar panel. A maximum power point tracking is used to assure optimal operation of the converter and as well as phase locked loop (PLL) is used for phase and frequency match. A novel scheme SPWM is implemented along with the solar panels for minimizing the voltage power fluctuations and also for reducing harmonics. Simulation and experimental results are shown for the voltage and current during the modes of operation.
A modified cascaded H-bridge multilevel inverter for solar applications
2014 International Conference on Green Computing Communication and Electrical Engineering (ICGCCEE), 2014
Renewable energy sources and technologies have the potential to provide solutions to the longstanding energy problems being faced by developing countries. The renewable energy sources like wind energy, solar energy, geothermal energy, ocean energy, biomass energy and fuel cell technology can be used to overcome energy shortage in India. This paper proposes a modified multi-level inverter (MLI) topology for Hybrid Renewable Energy Sources (HRES) and a design of hybrid solar-wind power generation model with 9-level, 13-level and 17-level inverter topologies. A HRES connected to a modified Cascaded H-Bridge Multi Level Inverter (CHB-MLI) is developed, whose switches are controlled using Artificial Neural Network (ANN) model. The proposed hybrid energy system model consists of 10 Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) that intend to give 17 levels of output voltage. The proposed topology performs effectively with reduced number of components and reduced Total Harmonic Distortion (THD). The performance of the proposed system is analyzed by designing the model in MATLAB/SIMULINK environment. The simulation results of the proposed inverter for the HRES application are compared with the results of the existing topologies to show the effectiveness of the proposed model.
This paper discourse about design and modeling of distributed Photovoltaic power system using a 11 Level Cascaded H-Bridge Inverter for the purpose of grid integration. The MOSFET switches helps in power quality improvement by decreasing the Total Harmonic Distortion using multilevel inverter. The proposed grid connected Power System has been designed and analyzed in MATLAB Simulink environment. Fuzzy Logic based Intelligent Controller has been implemented for voltage regulation at Point of Common Coupling of Grid connected PV Power System. Obtained results from Simulation model and compared with IEEE Standard 1547 for endorsing the effectiveness of the proposed system.