Phase shifted PWM cascaded multilevel inverter for solar PV grid integration
01 Jul 2016-pp 1-5
TL;DR: In this paper, the advantages of quality power output, high voltage compatibility, low electromagnetic compatibility concerns, and low power consumption of multilevel convertes have been discussed for power conversion using multi-level convertes.
Abstract: Power conversion using multilevel convertes became very popular in past few years. They have the advantages of quality power output, high voltage compatibility, low electromagnetic compatibility concerns.
Citations
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11 Nov 2022
TL;DR: In this paper , a hybrid reduced switch topology for the inverter is designed and connected to the grid using Phase Locked Loop (PLL) to analyze the performance of the inverters with the single-phase grid.
Abstract: The hike in the use of the high-power utilization, the want for the multilevel inverter (MLI) came into picture. The multilevel inverters are designed so as to obtain higher levels of voltage using very less numbers of resources. So, the design of a hybrid reduced switch topology for the inverter started. Further sources are modified in order to obtain a very large level of voltage with a smaller number of sources. Similar effort is made to designed hybrid inverter structures for 9-level and 11-level multi-level inverters (MLIs) with significantly reduced numbers of power electronics devices and direct current power supplies. Further the topology is controlled and connected to grid using Phase Locked Loop (PLL) to analyze the performance of the inverter with the single-phase grid. A current controller is build using Proportional-Resonant (PR) controller to achieve proper integration of the MLI with the grid. The reference waveform obtained from the controller is used to achieve the inverter gate pulse using Level Shift Pulse Width Modulation (LS-PWM) technology. The 11-level MLI is more efficiently integrated into the grid than the 9-level MLI.
TL;DR: In this paper , a clock phase-shifted (CPS) energy balance control method for grid-connected cascaded multilevel inverters for photovoltaic (PV) systems is proposed.
Abstract: Cascaded multilevel converters are promising candidates for grid-connected PV systems, but low-frequency ripples may exist in a DC link. Such ripples are not just inherent; they can occur due to environmental factors, such as variations in a certain range of irradiance of the PV. To address this issue, this article proposes a clock phase-shifted (CPS) energy balance control method for grid-connected cascaded multilevel inverters for photovoltaic (PV) systems. The proposed control scheme can prevent the low-frequency ripple of the DC link propagating to the power grid. Furthermore, it is feasible in principle and no adjustment of the control parameters is needed. The simulation and experimental results verify the effectiveness and feasibility of the proposed approach.
11 Nov 2022
TL;DR: In this paper , a hybrid reduced switch topology for the inverter is designed and connected to the grid using Phase Locked Loop (PLL) to analyze the performance of the inverters with the single-phase grid.
Abstract: The hike in the use of the high-power utilization, the want for the multilevel inverter (MLI) came into picture. The multilevel inverters are designed so as to obtain higher levels of voltage using very less numbers of resources. So, the design of a hybrid reduced switch topology for the inverter started. Further sources are modified in order to obtain a very large level of voltage with a smaller number of sources. Similar effort is made to designed hybrid inverter structures for 9-level and 11-level multi-level inverters (MLIs) with significantly reduced numbers of power electronics devices and direct current power supplies. Further the topology is controlled and connected to grid using Phase Locked Loop (PLL) to analyze the performance of the inverter with the single-phase grid. A current controller is build using Proportional-Resonant (PR) controller to achieve proper integration of the MLI with the grid. The reference waveform obtained from the controller is used to achieve the inverter gate pulse using Level Shift Pulse Width Modulation (LS-PWM) technology. The 11-level MLI is more efficiently integrated into the grid than the 9-level MLI.
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.
6,472Â citations
01 Jan 1980
TL;DR: In this article, a neutral-point-clamped PWM inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,432Â citations
TL;DR: The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
Abstract: A new neutral-point-clamped pulsewidth modulation (PWM) inverter composed of main switching devices which operate as switches for PWM and auxiliary switching devices to clamp the output terminal potential to the neutral point potential has been developed. This inverter output contains less harmonic content as compared with that of a conventional type. Two inverters are compared analytically and experimentally. In addition, a new PWM technique suitable for an ac drive system is applied to this inverter. The neutral-point-clamped PWM inverter adopting the new PWM technique shows an excellent drive system efficiency, including motor efficiency, and is appropriate for a wide-range variable-speed drive system.
4,328Â citations
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.
3,415Â citations
08 Oct 1995
TL;DR: This paper presents three multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources.
Abstract: Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed.
3,232Â citations