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A 5 Level Single Phase Flying Capacitor Multilevel Inverter

A 5 Level Single Phase Flying Capacitor Multilevel Inverter

© 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 348 Abstract -This paper presents a single phase 5 level Flying Capacitor Multilevel Inverter. In order to obtain multilevel output voltage waveforms, a switching strategy based on calculating switching angles is explained. Simulation and experimental results of multilevel voltage waveforms are given for 5 levels. The one phase leg of five level Flying Capacitor Multilevel Inverter is shown in this paper and the steps to synthesize the five level voltages is given. The Simulation block diagram and triggering diagram of the circuit is explained.
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A NOVEL FLYING CAPACITOR MULTILEVEL INVERTER WITH STABLE OUTPUT VOLTAGE

A NOVEL FLYING CAPACITOR MULTILEVEL INVERTER WITH STABLE OUTPUT VOLTAGE

The introduced FCMLI gives that it consists of less number of switches and gate drivers. And also it has features of voltage balancing property, purge the more dc source, double the output voltage levels, get better the output frequency range. The phase shift PWM technique can be used to achieve nine level output voltage. But in a new structure of FCMI the two low frequency switches makes to provide the full DC input i.e., for both the peak levels. And also produce a double RMS and increasing the output levels. And it is decreases the count of flying capacitors. The output voltages with nine level FCMI as shown in the figure. The THD and other parameters analysis are taken as from the simulation itself. The simulation output give a efficient, no distortions and without losses in the output levels. The proposed structure has a possibility to withstand in high power rating applications, such as ac drives, filters, FACTS controllers and etc., both the simulation and hardware results provide good performance and feasibility of proposed Flying Capacitor Multilevel Inverter (FCMI).
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OPEN LOOP ANALYSIS OF H-BRIDGE TYPE FLYING CAPACITOR MULTILEVEL INVERTER

OPEN LOOP ANALYSIS OF H-BRIDGE TYPE FLYING CAPACITOR MULTILEVEL INVERTER

KEYWORDS: Flying Capacitor Multilevel Inverter, Multilevel inverter, Phase Opposition Disposition –Pulse Width Modulation, Sinusoidal Pulse Width Modulation, Total Harmonic Distortion I NTRODUCTION The Multilevel voltage source inverter topologies are the best suited for medium and high voltage applications in the industries . Mainly, there are three topologies of multilevel voltage source inverters [1–5]: neutral point clamped (NPC) ,flying capacitor (FC) and cascaded H-bridge (CHB). The flying capacitor topology[6] allows the conventional inverter to produce higher output voltages by using standard low-voltage switches available in the market, controlling the real and reactive power flow easily.
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A Novel Hybrid Active Neutral Point Clamped Flying Capacitor Multilevel Inverter

A Novel Hybrid Active Neutral Point Clamped Flying Capacitor Multilevel Inverter

for PD scheme. IV. C OMPARISON WITH O THER T OPOLOGIES A Comparison between the proposed topology and different 5-level topologies in terms of component count and loss distribution is listed in table II. The 5-level NPC has low switch count but the major problems are unbalanced operation of dc-link capacitors, poor loss distribution among switches, and excessive number of diodes. 5-Level FC provides low switch count and excellent loss distribution but requires high number of flying capacitors that can adversely affect the initial cost, maintenance and replacement surcharges, and reliability of the inverter. Capacitors’ precharge requirement in some applications is also a drawback of this topology. The 5-level SMC topology provides lower capacitor count compared to FC and good loss distribution. However, high switch count and high frequency switches in series are the main issues of this topology. The 5-Level FC ANPC provides a good balance between the number of semiconductors and capacitors. The major issue with this topology is the poor loss distribution among the switches. The topology proposed in this paper,
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Compensating Voltage Sag Using 5-Level Flying Capacitor Multilevel Inverter Based DVR

Compensating Voltage Sag Using 5-Level Flying Capacitor Multilevel Inverter Based DVR

The control system presented in this paper has a wide range of applicability. It is used in a DVR system to eliminate voltage sags, harmonic voltages, and voltage imbalances within a band- width. Unlike other control schemes with a comparable range of applicability, only one controller is needed to cancel out all three disturbances simultaneously, while exhibiting good dynamic performance. On the one hand, a closed-loop controller, which consists of a feedback of the load voltage and the repetitive controller, guarantees zero tracking error in steady state. On the other hand, the applied control strategy for the voltage balancing of the flying capacitors, along with a feed forward term of the grid voltage and a controller for the output voltage of the DVR filter, provides excellent transient response.This paper is organized as follows. The model of a five-level flying- capacitor DVR is presented in Section II. The complete control-scheme structure is studied in Section III, including the three different control subsystems, namely, the filter output voltage controller, the repetitive control structure for the load voltage, and the flying-capacitor voltage regulator scheme, as well as the modulation method used to operate the multilevel converter.
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A NEW HYBRID ACTIVE NEUTRAL POINT CLAMPED FLYING CAPACITOR MULTILEVEL INVERTER FED INDUCTION MOTOR

A NEW HYBRID ACTIVE NEUTRAL POINT CLAMPED FLYING CAPACITOR MULTILEVEL INVERTER FED INDUCTION MOTOR

Sonam Gehlot 1 , J.S. Shakya 2 1,2 Electrical Engineering, Samrat Ashok Technological Institute, (India) ABSTRACT The paper proposes a new five-level hybrid Topology combination feature of natural point clamped and flying capacitor inverters. The future topology provides good loss distribution; avoid direct series connection of semiconductor devices. The five level Flying capacitor(FC) based on active neutral point clamped (ANPC) Inverter .The voltage across the FC’s and dc link capacitors be simultaneously controlled at their reference Voltage levels. NPC and FC inverters are the Most widely used topology of multilevel inverters In high power application. This paper present Basic operation and most used modulation and Control techniques developed to date. The discuses the main field of application and presents some technological Problems such as capacitor balance and losses. The features of this topology are investigated and Compared to other available topology and implement the induction motor of this paper.
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Analysis of Modified Five Level Flying Capacitor Based Multilevel Inverter

Analysis of Modified Five Level Flying Capacitor Based Multilevel Inverter

Analysis of Modified Five Level Flying Capacitor Based Multilevel Inverter P.Siva Prasad, Dr.G.Annapurna Abstract- Multilevel inverter concept gained importance because of high power handling capability and lower harmonic content in the output voltage. As the output voltage of multilevel inverters is synthesized from several levels of dc voltages, the harmonic distortion is minimum. Now -a- days, Carrier Based Pulse Width Modulation (CBPWM) technique gained importance as it can be easily extended to higher inverter levels and applied to Sinusoidal and Space Vector modulation schemes for control of multilevel inverters. This paper presents modified topology of Five level Flying Capacitor Multilevel Inverter with reduced number of dc bus capacitors and clamping capacitors.
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COMPARATIVE STUDY OF DIODE CLAMPED, FLYING CAPACITOR AND H-BRIDGE MULTILEVEL INVERTER HARMONICS REDUCTION

COMPARATIVE STUDY OF DIODE CLAMPED, FLYING CAPACITOR AND H-BRIDGE MULTILEVEL INVERTER HARMONICS REDUCTION

2. 5-level flying capacitor multilevel inverters The diodes in the diode-clamped topology can be replaced by clamping capacitors or floating capacitors to clamp the voltages. Such a topology is called flying capacitor multilevel inverter (FCMLI). FCMLI topologies are relatively new compared to the diode-clamped the cascaded H-bridge cell inverter topologies. Redundancy in the switching states is available by using flying capacitors instead of clamping diodes. This redundancy can be used to regulate the capacitor voltages and obtain the same desired level of voltage at the output. Figure2 shows a single- phase five-level FCMLI topology. The voltage across the capacitors is considered to be half of Dc source voltage Vdc. The output voltage consists of five different voltage levels + Vdc, Vdc/2, 0, -Vdc/2, and - Vdc. Similar to the other multilevel converter topologies, FCMLI also has complementary switch pairs. In the present considered circuit, switches Sa1 &Sa1 ׳, and Sa2 &Sa2 ׳ are complementary to each other.Similarly on the other limb, switches Sb1 &Sb1 ׳, and Sb2 &Sb2׳ are complementary to each other. The switching states available for such a topology are higher than that of the diode clamped. The number of voltage levels at the output can be increased by adding a pair of complementary switches and a capacitor. However, all the capacitors used in such topologies must be rated identically which can prove to be expensive and bulky in size. Single-phase five-level FCMLI topology VdcCa CbSa1Sa2
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Analysis And Comparison Of Flying Capacitor And Modular Multilevel Converters Using SPWM

Analysis And Comparison Of Flying Capacitor And Modular Multilevel Converters Using SPWM

II. REVIEW OF FLYING CAPACITOR AND MODULAR MULTILEVEL CONVERTER A. FLYING CAPACITOR MULTILEVEL INVERTER The topology of three phase three level flying capacitor multilevel inverter is shown in figure 1[10].It is also called as Capacitor Clamped or Imprecated cell inverter. It is similar to that of diode clamped multilevel inverter. The only difference is that here the clamping diodes are replaced by flying capacitors. The flying capacitor is also called as imprecated cell inverter. The flying capacitor is so called because the capacitors float with respect to earth’s potential. In flying capacitor multilevel inverters the switching combination or
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Title: Software Implementation of Flying Capacitor Clamp Three Level Inverter Drive for Induction Motor

Title: Software Implementation of Flying Capacitor Clamp Three Level Inverter Drive for Induction Motor

² Department of Electronics & Telecommunication Engineering R. T. M. N. U, India 1 pranali.gatfane@gmail.com; 2 kunal.s05@gmail.com Abstract— This paper is a simulation study of modulation strategies in three-phase three-level flying capacitor inverters in MATLAB Simulink. The flying capacitor multilevel converter is a recently developed converter topology assuring a flexible control and modular design. To improve the performance of Flying Capacitor Multilevel Inverter (FCMLI) implement the switching pattern selection scheme. This scheme reduces capacitor voltage fluctuation. This method is developed for sinusoidal voltage generation using the sinusoidal pulse width modulation technique the computer model allows a thorough investigation of all possible switching pattern permutations that produce the desired output and maintain steady state capacitor voltage balancing. Results show that the total harmonic distortion in a sinusoidal synthesised output can be minimised by the correct selection of the switching mode sequence.
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Comparison between flying capacitor and modular multilevel inverter

Comparison between flying capacitor and modular multilevel inverter

Since, there are similarities between the flying capacitor and modular multilevel inverters in their structures, operational principles and pulse width modulation techniques. In addition to, both inverters are depending on phase voltage redundancies to balance dc link capacitors rather than line-to-line redundancies as in case of diode clamped. Nonetheless, modular multilevel inverters perform better than flying capacitor inverter as number of levels increases. Therefore, detail comparisons between flying capacitor and modular multilevel inverter are investigated in this paper. Several operating conditions have been considered to demonstrate the abilities of both inverters in improving system reliability and their limitations. Computer simulation has been used to confirm the validity of the results.
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Analysis of Dual Flying Capacitor Active-Neutral-Point-Clamped Multilevel Inverter Induction Motor Drives

Analysis of Dual Flying Capacitor Active-Neutral-Point-Clamped Multilevel Inverter Induction Motor Drives

St.Johns College of Engineering &Technology, Yerrakota,Yemmiganur,Kurnool ,Andhra Pradesh ABSTRACT: This thesis aims to extend the knowledge about the performance of different multilevel inverter induction motor drives through harmonic analysis. Large electric drives and utility applications require advanced power electronics converter to meet the high power demands. As a result, multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations. Hybrid multilevel converters combine features of conventional multilevel topologies to provide an acceptable tradeoff between the advantages and disadvantages of these converters. For many industrial applications, common dc link is a requirement that limits the choice of topologies to neutral point clamped (NPC) and flying capacitor multicell (FCM) hybrid types. This paper investigates the operation of a hybrid five-level topology and proposes a modulation method that takes the advantage of the combined features of NPC and FCM. The dual flying capacitor (FC) active-neutral-point-clamped (DFC-ANPC) converter provides certain advantages such as natural soft switching of line frequency switches, elimination of the transient voltage balancing snubbers, and a more even loss distribution. Simulation results and verification of the five-level DFC-ANPC converter are presented to validate the performance of the converter as well as the applied modulation technique.. In particular, aspects of total harmonic distortion (THD) and modulation which are required or desirable for multilevel converters are discussed.
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Harmonic Analysis of Three level Flying Capacitor Inverter

Harmonic Analysis of Three level Flying Capacitor Inverter

Key Words: PD-SPWM, POD-PWM, THD, Modulation Index. 1. INTRODUCTION 1.1 Multilevel Inverters Multilevel inverters have drawn tremendous interest in power industry owing to their advantages such as higher efficiency, lower common mode voltage, lower voltage stress on power switches, lower dv/dt ratio, no EMI problems & its suitability for high voltage and high current applications [1].There are three types of multilevel inverters. They are Diode clamped or Neutral clamped, Flying capacitor or Capacitor clamped &. Cascaded H bridge multilevel inverters [2]-[3].During the 1980s the development of the Multilevel Converters did not move much forward. Only after ten years, at the turn of the decade, finally appeared articles about new applications, e.g. nuclear fusion, and new control methods.
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A New Diode-Clamped Multilevel Inverter for Capacitor Voltage Balancing

A New Diode-Clamped Multilevel Inverter for Capacitor Voltage Balancing

15. Peng, F. Z., J.-S. Lai, J. McKeever, and J. Van Coevering, “A multilevel voltage — source converter system with balanced DC voltages,” IEEE PESC Conf. Record, 1144–1150, June 1995. 16. Shukla, A., A. Ghosh, and A. Joshi, “Flying-capacitor-based chopper circuit for dc capacitor voltage balancing in diode-clamped multilevel inverter,” IEEE Trans. Ind. Electron., Vol. 57, No. 7, 2249–

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A Novel Asymmetrical Multilevel Inverter with Switched Capacitor Units for AC Motor

A Novel Asymmetrical Multilevel Inverter with Switched Capacitor Units for AC Motor

KEYWORDS: Multilevel inverter, series inverters, series– parallel connection, switched capacitor. I.INTRODUCTION Multilevel inverters have been under research and development for more than three decades and have found successful industrial applications. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. Large electric drives and utility applications require advanced power electronics converter to meet the high power demands. As a result, multilevel power converter structure has been introduced as an alternative in high power and medium voltage situations [1]. A multilevel converter not only achieves high power ratings, but also improves the performance of the whole system in terms of harmonics, dv/dt stresses, and stresses in the bearings of a motor. Several multilevel converter topologies have been also developed i) diode clamped, ii) flying capacitors, and iii) cascaded or H-bridge. Referring to the literature reviews, the cascaded multilevel inverter (CMI) with separated DC sources is clearly the most feasible topology for use as a power converter for medium & high power applications due to their modularization and extensibility [2].
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Particle Swarm Optimization Trained Artificial Neural Network to Control Shunt Active Power Filter Based on Multilevel Flying Capacitor Inverter

Particle Swarm Optimization Trained Artificial Neural Network to Control Shunt Active Power Filter Based on Multilevel Flying Capacitor Inverter

In this paper, the proposed controller for the SAPF current loop is based on an ANN whose parameters (weights and biases) are optimized by PSO. This control scheme is combined with simple proportional control to balance the floating capacitor voltage of FCI to achieve good performance of the SAPF-FCI and maintain the flying capacitor voltages around their references. This ensures a balanced voltage sharing on the converter switches of the FCI even under variations in the system parameters.

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VSC transmission system using flying capacitor multilevel converters and hybrid PWM control

VSC transmission system using flying capacitor multilevel converters and hybrid PWM control

It is assumed that the main dc capacitor and FCs were initially charged at 300 kV and 150 kV, respectively, prior to enabling both converter stations. Both converters were enabled at 0.05 s and then various reactive and active power orders were applied to the APC. Reactive and active power orders of 100 MVar at a rate of 100 MVar/20 ms and 200 MW (inverter operation) at a rate of 100 MW/20 ms were applied at 0.1 s and 0.2 s, respectively. A single-phase-to-ground fault was applied to the APC side at 0.8 s and cleared at 1.0 s. The proposed FC voltage balancing control was initially enabled but was disabled at 0.57 s and re-enabled at 0.69 s. The maximum peak converter current was set at 2 kA. Selected simulation results for the APC side are shown in Fig. 12 when the APC operated as an inverter. It has been found that the waveforms for the DCVC are very similar to those shown in Fig. 12 but not shown in the paper due to space limitations.
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Comparison between Cascaded Multilevel inverter and reduced switch multilevel inverter

Comparison between Cascaded Multilevel inverter and reduced switch multilevel inverter

A. Diode clamped inverter B. Flying capacitor inverter C. Cascaded inverter The most commonly efficient inverter is cascaded multilevel inverter (CMLI). It provides higher output voltage and power levels. It is one of the methods used for drive application which meet the requirements such as high power rating with reduced THD and switching losses. The CMLI consists of number of levels as the levels gets increase the number of switches gets increase. In order to overcome this problem, we use the concept of “switch reduction”. In this work, the new topology called reduced switch diode bridge topology is used to reduce the switches and separate dc-source in CMLI. The MOSFETs used as semiconductor switches.
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127 Multilevel Inverter

127 Multilevel Inverter

© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 147 power switches and capacitor are used and the THD is around 13% these are major drawbacks of this method. Miao Chang-xin et al (2010), have presented Flying capacitor multilevel inverters. In order to improve the harmonic performance of the output voltage under low modulation index region, the paper presents a novel PWM method for flying capacitor multilevel inverters based on the idea of controlling freedom degree. The novel PWM method can balance the flying capacitor voltage in a certain period. The validity of the novel PWM method is demonstrated by the experimental results. The proposed PWM method is efficient for five-level output only, as the number of output level increase the THD in the output also increase.
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Flying Capacitor Multilevel Flyback Converter

Flying Capacitor Multilevel Flyback Converter

Figure 3.1 shows the proposed FCMFC in a series configuration for pulsed power applications. DCM operation is used here due to the pulse nature of the output voltage required. This also allows for maximum energy transfer because the inductor current reaches zero when discharging into flying capacitors. Both the upper and lower converters within the structure function in unison to provide high voltage peaks to the load. There are also diodes added to the phase leg of the secondary side of the transformer to prevent reverse current while charging the magnetizing inductor. Similar to the single FCMFC, this series configuration was simulated in PLECS to demonstrate operation. The converter was sized to match that of the case in [9] and parameters are shown in Table 6. The converter is defined by the number of voltage levels, N, for a given FCMFC, and by the number of series connected converters, M. This makes for MxN possible configurations. A 3x2 configuration is shown in Figure 3.1.
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