A new transistor clamped 5-level H-bridge multilevel inverter with voltage boosting capacity
01 Dec 2012-pp 1-5
TL;DR: A new topology of the multilevel inverter with feature like output voltage boosting capability along with capacitor voltage balancing is presented, comparing with conventional cascaded H-bridge inverter topology.
Abstract: Multilevel converters offer high power capability, resulting with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This paper presents a new topology of the multilevel inverter with feature like output voltage boosting capability along with capacitor voltage balancing. The proposed multilevel inverter uses transistor clamped H-bridge (TCHB) with an bidirectional switch and four auxillary switches producing a boost output voltage. The single unit of new topology produces five-level output with output voltage double the input DC voltage where as a single unit of conventional H-bridge produces three-level output voltage similar to input DC voltage. The comparison has made between the proposed five-level inverter and conventional cascaded five-level inverter in terms of the output voltage, total harmonic distortion (THD), No. of switching devices used etc. The analysis of the output voltage harmonics is carried out and compared with conventional cascaded H-bridge inverter topology. The proposed multilevel inverter topology is modeled using matlab / simulink. From the results the proposed inverter provides more output voltage.
Citations
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Patent•
14 Aug 2013
TL;DR: In this paper, a voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point voltage balance capability is presented. But the inverter circuit controller is used for generating a PWM signal required by a three-phase half-bridge inverter.
Abstract: The invention discloses a voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point voltage balance capability, which is characterized in that a PV photovoltaic array is connected with a voltage-multiplying circuit and used for converting solar energy into electric energy and providing direct current voltage Udc for the voltage-multiplying circuit; the voltage-multiplying circuit is connected with a voltage-multiplying circuit controller, the PV photovoltaic array and an inverter circuit and used for completing a multiplying function for voltage at the direct current side; the inverter circuit is connected with the voltage-multiplying circuit and an inverter circuit controller and used for realizing conversion between active energy at the direct current side and that at the alternating current side; the voltage-multiplying circuit controller is used for generating a pulse signal of a voltage-multiplying circuit switching tube for conducting the equal duty ratio of the switching tube so as to inhibit neutral point potential shift; and the inverter circuit controller is used for generating a PWM signal required by a three-phase half-bridge inverter circuit. The voltage-multiplying three-level photovoltaic grid-connected inverter disclosed by the invention has the advantages that automatic voltage-multiplying at the front stage is realized, and neutral point potential shift and neutral point potential low-frequency fluctuation can be inhibited in any power-factor of load, so that neutral point balance is automatically realized.
13 citations
TL;DR: This paper focuses on Coordinated Control Scheme (CCS) for solar photovoltaic system using Hybrid Resonant Boost (HRB) converter and multilevel inverter and simulation results are used to validate the function of CCS.
Abstract: Background/Objectives: This paper focus on Coordinated Control Scheme (CCS) for solar photovoltaic system using Hybrid Resonant Boost (HRB) converter and multilevel inverter. Methods/Statistical Analysis: The Maximum power point tracking has been implemented using Modified Perturb and Observe (MPO) algorithm. MPO algorithm mitigates the output power oscillation and maintain the Photovoltaic panel at maximum operating point. Findings: The HRB converter feeds a DC power to Modified nine level inverter to maintain the quality sinusoidal output. It also reduces the level of harmonics in the output to maintain the system output within standard level. Zero Current Switching (ZCS), Zero Voltage Switching (ZVS) and HRB topologies has been simulated using MATLAB/SIMULINK. The simulation results are used to validate the function of CCS. Applications: The proposed system is implemented for off grid solar photovoltaic (PV) power plant model.
7 citations
Journal Article•
TL;DR: In this article, a new graphical method was proposed to determine the triggering angle of the neutral point clamped multilevel inverter (NPCMI), which utilized the ideal sinusoidal waveform as the basis of the calculation.
Abstract: This paper proposes a new graphical method analysis to determine the triggering angle of the Neutral-Point-Clamped Multilevel Inverter (NPCMI). The proposed graphical method analysis utilised the ideal sinusoidal waveform as the basis of the calculation. Based on the desired sinusoidal output waveform and switching state of Neutral-Point-Clamped Multilevel Inverter, triggering angle of each switching devices are calculated and determined. The triggering angles have been calculated for 3-level, 5-level and 7-level. Total Harmonics Distortion (THD) values of line voltage and phase voltage are calculated and compared and it has been concluded that this method is successfully applied where the low THDs values are obtained.
Patent•
20 May 2013
TL;DR: In this article, a voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point voltage balance capability is presented. But the inverter circuit controller is used for generating a PWM signal required by a three-phase half-bridge inverter.
Abstract: The invention discloses a voltage-multiplying three-level photovoltaic grid-connected inverter with neutral point voltage balance capability, which is characterized in that a PV photovoltaic array is connected with a voltage-multiplying circuit and used for converting solar energy into electric energy and providing direct current voltage Udc for the voltage-multiplying circuit; the voltage-multiplying circuit is connected with a voltage-multiplying circuit controller, the PV photovoltaic array and an inverter circuit and used for completing a multiplying function for voltage at the direct current side; the inverter circuit is connected with the voltage-multiplying circuit and an inverter circuit controller and used for realizing conversion between active energy at the direct current side and that at the alternating current side; the voltage-multiplying circuit controller is used for generating a pulse signal of a voltage-multiplying circuit switching tube for conducting the equal duty ratio of the switching tube so as to inhibit neutral point potential shift; and the inverter circuit controller is used for generating a PWM signal required by a three-phase half-bridge inverter circuit. The voltage-multiplying three-level photovoltaic grid-connected inverter disclosed by the invention has the advantages that automatic voltage-multiplying at the front stage is realized, and neutral point potential shift and neutral point potential low-frequency fluctuation can be inhibited in any power-factor of load, so that neutral point balance is automatically realized.
Journal Article•
TL;DR: This paper focuses on single phase 5 level inverter with characteristics like output voltage boosting ability along with capacitor voltage control, and uses CHB with bidirectional switches and 4 auxiliary switches producing boost up output voltage.
Abstract: Cascaded H-bridge MLI is most efficient topology for medium and high voltage DC-AC conversion, having less output harmonics and less commutation losses. Disadvantages is their complexity, more no. of power devices, passive components and a complex control circuitry. This paper focus on single phase 5 level inverter with characteristics like output voltage boosting ability along with capacitor voltage control. The proposed topology uses CHB with bidirectional switches and 4 auxiliary switches producing boost up output voltage. Here a hybrid PWM technique is applied to control the power devices. There is comparative study between CHB and proposed topology between number of power devices used and THD. THD of proposed topology is reduced and analyzed by FFT window. The result are simulated by MATLAB/SIMULINK software.
Cites background from "A new transistor clamped 5-level H-..."
...capacitor C1 and C2 are divided as capacitor voltage[7]....
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References
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TL;DR: The most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-Clamped (flying capacitor), and cascaded multicell with separate DC sources are presented and the circuit topology options are presented.
Abstract: Multilevel inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. This paper presents the most important topologies like diode-clamped inverter (neutral-point clamped), capacitor-clamped (flying capacitor), and cascaded multicell with separate DC sources. Emerging topologies like asymmetric hybrid cells and soft-switched multilevel inverters are also discussed. This paper also presents the most relevant control and modulation methods developed for this family of converters: multilevel sinusoidal pulsewidth modulation, multilevel selective harmonic elimination, and space-vector modulation. Special attention is dedicated to the latest and more relevant applications of these converters such as laminators, conveyor belts, and unified power-flow controllers. The need of an active front end at the input side for those inverters supplying regenerative loads is also discussed, and the circuit topology options are also presented. Finally, the peripherally developing areas such as high-voltage high-power devices and optical sensors and other opportunities for future development are addressed.
6,472 citations
"A new transistor clamped 5-level H-..." refers background in this paper
...In case of the asymmetrical CHB DC bus voltage is varied in each power as per the requirement to increase the voltage levels [2], [5]....
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TL;DR: This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry.
Abstract: Multilevel converters have been under research and development for more than three decades and have found successful industrial application. However, this is still a technology under development, and many new contributions and new commercial topologies have been reported in the last few years. The aim of this paper is to group and review these recent contributions, in order to establish the current state of the art and trends of the technology, to provide readers with a comprehensive and insightful review of where multilevel converter technology stands and is heading. This paper first presents a brief overview of well-established multilevel converters strongly oriented to their current state in industrial applications to then center the discussion on the new converters that have made their way into the industry. In addition, new promising topologies are discussed. Recent advances made in modulation and control of multilevel converters are also addressed. A great part of this paper is devoted to show nontraditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in many industrial sectors. Finally, some future trends and challenges in the further development of this technology are discussed to motivate future contributions that address open problems and explore new possibilities.
3,415 citations
Book•
21 May 1993
TL;DR: In this article, the authors present an overview of three-phase transformers and their application in DC-DC Converters, including the following: 1. Power Semiconductor Diodes and Circuits 2. Power Transistors 3. Diode Rectifiers 4. Power Supplies. 5. DC Drives.
Abstract: 1. Introduction. 2. Power Semiconductor Diodes and Circuits. 3. Diode Rectifiers. 4. Power Transistors. 5. DC-DC Converters. 6. Pulse-width Modulated Inverters. 7. Thyristors. 8. Resonant Pulse Inverters. 9. Multilevel Inverters. 10. Controlled Rectifiers. 11. AC Voltage Controllers. 12. Static Switches. 13. Flexible AC Transmission Systems. 14. Power Supplies. 15. DC Drives. 16. AC Drives. 17. Gate Drive Circuits. 18. Protection of Devices and Circuits. Appendices: Three-phase Circuits, Magnetic Circuits, Switching Functions of Converters, DC Transient Analysis, Fourier Analysis, Thyristor Commutation Techniques, Data Sheets.
2,055 citations
"A new transistor clamped 5-level H-..." refers background or methods in this paper
...PWM techniques such as single pulse PWM, space vector PWM, multiple pulse PWM, phase displacement control [1]....
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...The synthesized multilevel outputs are superior in quality which results in reduced filter requirements [1]....
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...Multilevel inverter has to synthesize a staircase waveform by using the modulation technique to have the controlled output voltage [1]....
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TL;DR: A new multilevel converter topology that has many steps with fewer power electronic switches results in reduction of the number of switches, losses, installation area, and converter cost.
Abstract: This paper introduces a new multilevel converter topology that has many steps with fewer power electronic switches. The proposed circuit consists of series-connected submultilevel converters blocks. The optimal structures of this topology are investigated for various objectives, such as minimum number of switches and capacitors, and minimum standing voltage on switches for producing maximum output voltage steps. A new algorithm for determination of dc voltage sourcespsila magnitudes has also been presented. The proposed topology results in reduction of the number of switches, losses, installation area, and converter cost. The operation and performance of the proposed multilevel converter has been verified by the simulation and experimental results of a single-phase 53-level multilevel converter.
645 citations
"A new transistor clamped 5-level H-..." refers background in this paper
...[6] Ebrahim Babaei, 2008, “A Cascade Multilevel Converter Topology With Reduced Number of Switches” IEEE Transactions on power electronics, Vol....
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...…A survey of topologies, controls, and applications,” IEEE Transaction on Industrial electronics, vol. 49, no. 4, pp. 724–738, Aug. 2002 [6] Ebrahim Babaei, 2008, “A Cascade Multilevel Converter Topology With Reduced Number of Switches” IEEE Transactions on power electronics, Vol. 23, No.6....
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...[5] J. Rodríguez, J. S. Lai, and F. Z. Peng, “Multilevel inverters: A survey of topologies, controls, and applications,” IEEE Transaction on Industrial electronics, vol. 49, no. 4, pp. 724–738, Aug. 2002 [6] Ebrahim Babaei, 2008, “A Cascade Multilevel Converter Topology With Reduced Number of Switches” IEEE Transactions on power electronics, Vol. 23, No.6....
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...clamped topology is popular now a days as it provides provision to increase the output levels by taking different voltage levels from the series stacked capacitors [6], [7]....
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TL;DR: In this article, a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch was proposed, which produces a significant reduction in the number of power devices and capacitors required to implement a multilabel output.
Abstract: Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work reports a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. The new topology is used in the design of a five-level inverter; only five controlled switches, eight diodes, and two capacitors are required to implement the five-level inverter using the proposed topology. The new topology achieves a 37.5% reduction in the number of main power switches required (five in the new against eight in any of the other three configurations) and uses no more diodes or capacitors that the second best topology in the literature, the Asymmetric Cascade configuration. Additionally, the dedicated modulator circuit required for multilevel inverter operation is implemented using a FPGA circuit, reducing overall system cost and complexity. Theoretical predictions are validated using simulation in SPICE, and satisfactory circuit operation is proved with experimental tests performed on a laboratory prototype
277 citations
Additional excerpts
...[12] Gerardo Ceglia, Víctor Guzmán, Carlos Sánchez, Fernando Ibáñez, Julio Walter, and María I....
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