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Proceedings ArticleDOI

A review of various carrier based PWM methods for multilevel inverter

10 Mar 2011-pp 1-6
TL;DR: In this article, a simulation of various carrier-based PWM methods had been explained and comparison also discussed, where results and comparison of results and results of the simulation were discussed.
Abstract: The Multilevel inverter is emerging as a new breed of power inverter option for high power applications, Especially for FACTS controllers. This can create high voltage and reduce harmonics by its own circuit topology. The power levels of the inverter are largely restricted by carrier frequency. For air cooled design the frequency is practically limited to 3 to 5 KHz for large inverters, hence to increase power level it is proposed to operate two inverters in parallel with phase shifted carrier. The equivalent carrier frequency can be doubled and the output harmonics will be reduced here in this paper simulation of various carrier based PWM methods had been explained. Results and comparison also discussed.
Citations
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Journal ArticleDOI
TL;DR: Experimental results for a 2.5-kW 47-level prototype of the switch-ladder multilevel inverter are provided including the following: input and output voltage and current waveforms under resistive and inductive loads, efficiency, total harmonic distortion, voltage stresses across the switches, behavior of the system under fault condition, and no-load power dissipation.
Abstract: This paper provides experimental results for a 2.5-kW 47-level prototype of the switch-ladder multilevel inverter including the following: input and output voltage and current waveforms under resistive and inductive loads, efficiency, total harmonic distortion, voltage stresses across the switches, behavior of the system under fault condition, and no-load power dissipation. The most important advantage of this inverter is that only four switches conduct in each interval in low frequency. This matter, beside the elimination of switching losses, has made this inverter an efficient choice with 97% peak efficiency. The ability to continue working with open-circuit modules is another advantage of the inverter. Furthermore, some important factors behind the unreliability and inefficiency of inverters have been improved, including the following: low duty cycle of conducting switches, staircase voltage stresses across switches with low-voltage steppes, line switching frequency results in low temperature of switches, possibility of removing low-pass filters, and independence to capacitors. The inverter is proposed to be an advantageous choice in low-voltage stand-alone photovoltaic applications.

22 citations

Proceedings ArticleDOI
01 Nov 2016
TL;DR: In this paper, a diode clamped multilevel inverter (MLI) has been selected and its performance with several conventional CBPWM techniques has been analyzed using MATLAB simulation.
Abstract: Multilevel Inverters (MLI) are used in electrical drives in industries especially for medium/high power applications due to the low total harmonic distortion (THD) contents in voltage waveform and high utilization factor. For control of output voltage several pulse width modulation techniques are used. Carrier based PWM (CBPWM) techniques are quite simple compared to space vector modulation. In this paper diode clamped MLI has been selected and its performance with several conventional CBPWM techniques has been analyzed using MATLAB simulation. The analysis is based on four different reference signals taken with carrier wave. The variation of THD with amplitude modulation index is shown for all CBPWM technique. Gate signal generation for all the CBPWM techniques using TMS320F28335 has also been included in this paper.

12 citations

Journal ArticleDOI
TL;DR: Simulation results show that DC voltage ripples which cause inter harmonics are less than previous similar switching method; Hence for allowable DC voltage ripple, smaller capacitor is required.
Abstract: In this paper different high frequency switching methods for multilevel inverters which has been proposed for PV applications is analyzed; furthermore, the output harmonics content of phase shifted PWM (PSPWM) and in phase disposition PWM (IPDPWM) switching methods are comprised. This simulation results show that total harmonics content in IPDPWM is less than PSPWM method; besides, modified switching method of IPDPWM which solves the unequal power sharing problem of it is also proposed. This switching method is applied to a 7 levels inverter which is fed by three PV array DC sources and supply an AC load. These PV arrays deliver maximum power via DC-DC converter and perturb and observe algorithm. Simulation results show effectiveness of this method in sharing equal powers among different cells of the multilevel inverter which are supposed to be PV arrays; furthermore, results show that DC voltage ripples which cause inter harmonics are less than previous similar switching method; Hence for allowable DC voltage ripple, smaller capacitor is required. Simulation is implemented by MATLAB/SIMULINK software.

11 citations

Proceedings ArticleDOI
22 Dec 2011
TL;DR: In this article, a new hardware strategy is proposed to increase the reliability of the Switch-Ladder multi-level inverter against short-circuit (S.C.) faults in the H-Bridge and main switches' Blocks.
Abstract: A new hardware strategy is proposed to increase the reliability of the Switch-Ladder multi-level inverter against short-circuit (S.C.) faults in the H-Bridge and main switches' Blocks. The strategy includes passive and active bypassing. Passive bypassing approach hires fuses in series-connection with the ladder`s steps. Instead, in the active method, relays are replaced the fuses and receive commands from a controller that monitors the short-circuit failures continuously. When a switch fails in short circuit behaviour, the ladder contains the failed switch is converted to open-circuit (O.C.). Owning to the ability of Switch-Ladder multi-level inverter to tolerate open-circuit faults due to its configuration and switching strategy, reliability is increased against short-circuit failures through inverting the short-circuit to open-circuit. At last the experimental result validates the claims.

7 citations


Cites background from "A review of various carrier based P..."

  • ...Because of several benefits in terms of power electronic conversion such as low THD, simple control techniques, compactness, dependability and capacity of controlling greater power in the form of high voltage and current offered by multi-level inverters [1-4], there has been evidence of its increasing significance over the last couple of years [5-22] ....

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Proceedings ArticleDOI
05 Jun 2013
TL;DR: The control system for Cascaded H-bridge (CHB) converter is proposed and allows to good voltage stabilization on the DC-link capacitors.
Abstract: The control system for Cascaded H-bridge (CHB) converter is proposed in this paper. The converter output voltage is controlled using a Space-Vector Pulse Width Modulation (SV-PWM). The DC-link voltages are controlled by appropriate choice of H-Bridges, used to output voltage generation. The simulation researches of two multilevel CHB rectifiers are presented. These rectifiers were utilized to coupling of two AC grids. Proposed control strategy allows to good voltage stabilization on the DC-link capacitors.

5 citations

References
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Proceedings ArticleDOI
08 Oct 1995
TL;DR: A new multilevel voltage-source inverter with separate DC sources is proposed for high-voltage, high power applications, such as flexible AC transmission systems (FACTS) including static VAr generation (SVG), power line conditioning, series compensation, phase shifting, voltage balancing, fuel cell and photovoltaic utility systems interfacing, etc.
Abstract: A new multilevel voltage-source inverter with separate DC sources is proposed for high-voltage, high-power applications, such as flexible AC transmission systems (FACTS) including static VAr generation (SVG), power-line conditioning, series compensation, phase shifting, voltage balancing, fuel cell, and photovoltaic utility systems interfacing, etc. The new M-level inverter consists of (M-1)/2 single-phase full bridges in which each bridge has its own separate DC source. This inverter can generate almost sinusoidal waveform voltage with only one time switching per cycle as the number of levels increases. It can solve the size-and-weight problems of conventional transformer-based multipulse inverters and the component-counts problems of multilevel diode-clamp and flying-capacitor inverters. To demonstrate the superiority of the new inverter, an SVG system using the new inverter topology is discussed through analysis, simulation, and experiment.

1,024 citations

Journal ArticleDOI
12 Oct 1998
TL;DR: The proposed STATCOM has the advantages of a reduced number of VSIs; the VSIs being identical and extremely fast in response to reactive power change and the size of inductor and DC capacitors can be further reduced.
Abstract: In this paper, a new type of static compensator (STATCOM) is proposed. This new STATCOM is constructed by cascading several identical full-bridge (H bridge) voltage-source inverters (VSIs). A so-called phase-shifted sinusoidal pulsewidth modulation (SPWM) unipolar voltage switching scheme is applied to control the switching devices of each VSI. The harmonics in STATCOM current caused by the DC voltage ripple is rejected by a new method developed in this paper. As a result, the size of inductor and DC capacitors can be further reduced. A very effective startup procedure is proposed to start up the STATCOM. The proposed STATCOM has the advantage of a fewer number of VSIs, the VSIs being identical and extremely fast in response to reactive power change.

340 citations

Proceedings ArticleDOI
02 Nov 2004
TL;DR: In this paper, a cascade multilevel voltage-source inverter with separate dc sources is proposed for static synchronous compensation (STATCOM), which can solve the size-and-weight problems of conventional transformer-based multipulse inverters and the component-counts problems of multi-level diode-clamp and flying-capacitor inverter.
Abstract: A cascade multilevel voltage-source inverter with separate dc sources is proposed for static synchronous compensation (STATCOM). It can solve the size-and-weight problems of conventional transformer-based multipulse inverters and the component-counts problems of multilevel diode-clamp and flying-capacitor inverter. Phase-shift sinusoidal pulse width modulation (PS-SPWM) technique is employed to control the switching devices of each voltage-source inverter, as a result, the devices operate at a higher equivalent carrier frequency. In conclusion, the inverter has such advantages as: 1) reducing power loss because of transform-less design; 2) generating almost sinusoidal waveform voltage with high equivalent carrier frequency; 3) eliminating transformers of multipulse inverters used in the conventional STATCOM; 4) dynamic response fast; and 5) direct connection to power distribution system without any transformer. This paper focuses on feasibility and control schemes of the cascade multi-level inverter. Simulation of a three-phase 5-level inverter with reactive power regulation using MATLAB-Simulink power system blockset is carried out. The analytical and simulated results show the feasibility and superiority of the proposed inverter for static synchronous compensation.

47 citations

Proceedings ArticleDOI
02 Nov 2003
TL;DR: Based on the conventional sinusoidal pulse width modulation technique (SPWM) and the multi-module-cascade circuit topology configuration, an optimized PWM technology was proposed in this article, which combines the dual SPMW technique applied to each inverter module and the phase-shifting PS-SPWM technique.
Abstract: Based on the conventional sinusoidal pulse width modulation technique (SPWM) and the multi-module-cascade circuit topology configuration, this paper proposes an optimized pulse width modulation (PWM) technology, which combines the dual sinusoidal pulse width modulation (DSPWM) technique applied to each inverter module and the phase-shifting sinusoidal pulse width modulation (PS-SPWM) technique. This modulation obtains high equivalent carrier frequency through canceling the lower harmonics, hence the device loss is decreased significantly; at the same time, owing to the special topology, the range of the output voltage is extended, and the high power capacity of the inverter system is realized. At last, a 30 kW high-power inverter is developed.

5 citations