A meticulous analysis of induction motor drive fed from a nine-level Cascade H-Bridge inverter with level shifted multi carrier PWM
28 Mar 2013-pp 6-12
TL;DR: The meticulous analysis of three phase induction motor drive fed by Cascade H-Bridge multilevel inverter reveals that the CHBMLI is more appropriate for induction motorDrive.
Abstract: Almost 80% of the industrial loads are induction motors. This paper scrutinizes the meticulous analysis of three phase induction motor drive fed by Cascade H-Bridge multilevel inverter (CHBMLI. As a first step the performance of the induction motor drive with the normal voltage source inverter has been examined. Then the drive system has been studied with various levels of cascade H-Bridge inverter. A level shifted multi carrier PWM technique has been used for the CHBMLI. An exhaustive survey is made in order to study the various performance indices such as load torque, motor speed and efficiency. The entire system has been built in Matlab / Simulink and the simulation results are provided. To show the improvisation in the drive performance five- level and nine-level fed induction motor drive results are presented in this paper. The results reveal that the CHBMLI is more appropriate for induction motor drive.
Citations
More filters
TL;DR: A simple and compact structure for transformer-based multilevel inverters is introduced since the number of utilized components in the proposed structure is remarkably reduced, the cost, volume, and complexity are minimized.
Abstract: The main problem related to cascaded H-bridge (CHB) cell multilevel inverters is their using of a large number of components, such as switches and dc-sources. Therefore, minimization of components in these kinds of devices is of great importance. Cascaded-transformer multilevel inverters (CTMIs) have completely eliminated the need for several dc-sources in CHBs. Thus, minimization of the other components in CTMIs can lead to obtain an optimized structure for multilevel inverters. This paper introduces a simple and compact structure for transformer-based multilevel inverters. Since the number of utilized components in the proposed structure is remarkably reduced, the cost, volume, and complexity are minimized. The performance of the suggested inverter has been scrutinized through two different strategies. First, it is tested under condition of supplying a local load, and second, employing sample-based current control strategy; its performance is inspected when being connected to the grid. In the latter test, the leakage inductances of the transformers are utilized to execute the sample-based current control strategy, thus, the need for extra filter is eradicated. The feasibility of the suggested topology has been validated by using the laboratory-built prototype along with a computer-aided simulated model.
62 citations
Cites background from "A meticulous analysis of induction ..."
...a higher power and higher quality voltage, minimize dv/dt on switches and load, alleviate electromagnetic interface, and develop lower switching losses and smaller common mode voltages [1]–[4]....
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Patent•
20 Apr 2018
TL;DR: In this paper, a high-performance output driving circuit is proposed, which consists of an output logic unit, a level conversion unit, an output stage, and a buffer unit.
Abstract: The invention discloses a high-performance output driving circuit, which comprises an output logic unit, a level conversion unit, a buffer unit and an output stage, wherein the output logic unit is used for converting DOUT output by a chip core into two paths of controlled output signals under the control of an enable signal E; THE level conversion unit is used for converting the two paths of controlled output signals with low power supply voltage level of the chip core into two paths of controlled high-voltage output signals with high power supply voltage level of an IO interface circuit, andoutputting the two paths of controlled high-voltage output signals to the buffer unit; the buffer unit is used for increasing driving capacity stage by stage, so as to drive a large-size MOS transistor of the output state; and the output stage is used for transmitting an output signal OUT to a welding pad so as to provide a driving current required for driving a peripheral circuit, and driving anoutput load. By adopting the high-performance output driving circuit, the influence of voltage variations of a parasitic resistor on the operation of an entire output circuit can be effectively reduced when a parasitic capacitor is being charged and discharged by means of a high power supply voltage VCCIO and ground VSSIO of the IO interface circuit, and the reliability of operation of the outputcircuit can be improved.
3 citations
TL;DR: This paper presents the three-phase CHB inverter fed induction motor suitable for renewable energy source applications, implemented in matlab/simulink and showing good dynamic performance.
Abstract: This paper presents the three-phase CHB inverter fed induction motor suitable for renewable energy source applications. Normally, all present existing multilevel inverters produce multilevel output, but the number of components required is more, bulk in size, more in cost. Which are more burdens to small capacity renewable sources. These challenges are eliminated in CHB inverter. This CHB mainly consisting of one DC source, one capacitor and eight switches in each phase. To generate a five-level output in phase to ground voltage, it is required to maintain the capacitor voltage (V2) at fifty percent of the DC source voltage (V1). This capacitor voltage is regulated by a sensor less voltage regulating technique. The sensor less voltage regulation works without any sensor devices. We can implement this technique with very less cost compared to other techniques. The sensor less voltage regulation is realized by level-shifted sinusoidal pulse width modulation. The simulation results show a very good dynamic performance. Controller maintains the capacitor voltage at fifty percent of the source voltage irrespective of main source voltage changes and load changes. Inverter generates a five-level wave at the output from line to ground and seven-level wave from line to line with fewer Harmonic. It is implemented in matlab/simulink and showing good dynamic performance.
2 citations
Cites methods from "A meticulous analysis of induction ..."
...Sensor less voltage regulation is analyzed mathematically and control reference signals are modulated by level-shifted SPWM technique [9-16]....
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Journal Article•
TL;DR: In this paper, the authors presented a nine level inverter using reverse voltage topology, which requires less power switches compared to conventional multilevel inverter and less carrier signals and gate drives.
Abstract: Multi-level inverter technology has emerged recently as a very important alternative in the area of high-power medium-voltage energy control. However, output current of the inverter as well as the time duration of the redundant switching states have been neglected. Moreover the advantages like high quality power output, low switching losses, low electro-magnetic interference (EMI) and high output voltage made multilevel inverter as a powerful solution in converter topology. Conventionally cascaded H-bridge multi level inverter used. The main disadvantage with the cascaded H-bridge inverters is high number of power switches which makes the control method complex and hence high cost. This paper presents a nine level inverter using reverse voltage topology. This topology requires less power switches compared to conventional multilevel inverter and less carrier signals and gate drives. The proposed reverse voltage inverter is studied under open loop and fuzzy based closed loop controllers. For the analysis of the speed responses of the induction motor under open loop and fuzzy based closed loop control techniques detailed simulation has been carried out in MATLAB/Simulink.
Key words: CHBMLI; Reverse voltage technique (reduced switches); fuzzy logic controller; Multi carrier PWM; phase disposition SPWM; THD; 3 phase squirrel cage induction motor drive
1 citations
References
More filters
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
TL;DR: This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters.
Abstract: This paper presents a technology review of voltage-source-converter topologies for industrial medium-voltage drives. In this highly active area, different converter topologies and circuits have found their application in the market. This paper covers the high-power voltage-source inverter and the most used multilevel-inverter topologies, including the neutral-point-clamped, cascaded H-bridge, and flying-capacitor converters. This paper presents the operating principle of each topology and a review of the most relevant modulation methods, focused mainly on those used by industry. In addition, the latest advances and future trends of the technology are discussed. It is concluded that the topology and modulation-method selection are closely related to each particular application, leaving a space on the market for all the different solutions, depending on their unique features and limitations like power or voltage level, dynamic performance, reliability, costs, and other technical specifications.
2,254 citations
TL;DR: An attempt is made to provide a brief review of the current state of the art in the area of variable-speed drives, addressing the reasons for potential use of multiphase rather than three-phase drives and the available approaches to multiphases machine designs.
Abstract: Although the concept of variable-speed drives, based on utilization of multiphase machines, dates back to the late 1960s, it was not until the mid- to late 1990s that multiphase drives became serious contenders for various applications. These include electric ship propulsion, locomotive traction, electric and hybrid electric vehicles, ldquomore-electricrdquo aircraft, and high-power industrial applications. As a consequence, there has been a substantial increase in the interest for such drive systems worldwide, resulting in a huge volume of work published during the last ten years. An attempt is made in this paper to provide a brief review of the current state of the art in the area. After addressing the reasons for potential use of multiphase rather than three-phase drives and the available approaches to multiphase machine designs, various control schemes are surveyed. This is followed by a discussion of the multiphase voltage source inverter control. Various possibilities for the use of additional degrees of freedom that exist in multiphase machines are further elaborated. Finally, multiphase machine applications in electric energy generation are addressed.
1,683 citations
TL;DR: Simulation and practical results will confirm the performance of the proposed strategy when using the multilevel inverter to control an induction motor by the DTC principle.
Abstract: In this paper, the requirements imposed by a direct torque control (DTC) strategy on multilevel inverters are analyzed. A control strategy is proposed in order to fulfill those requirements when a flying-capacitor multilevel inverter is used. Simulation and practical results will confirm the performance of the proposed strategy when using the multilevel inverter to control an induction motor by the DTC principle. Also, the advantages of using a multilevel inverter with a DTC strategy are shown by simulation results.
318 citations
TL;DR: In this paper, all possible solutions to the problem of eliminating harmonics in a switching converter are found. But, the authors did not consider the case of the fifth and seventh harmonics.
Abstract: The problem of eliminating harmonics in a switching converter is considered. That is, given a desired fundamental output voltage, the problem is to find the switching times (angles) that produce the fundamental while not generating specifically chosen harmonics. In contrast to the well known work of Patel and Hoft and others, here all possible solutions to the problem are found. This is done by first converting the transcendental equations that specify the harmonic elimination problem into an equivalent set of polynomial equations. Then, using the mathematical theory of resultants, all solutions to this equivalent problem can be found. In particular, it is shown that there are new solutions that have not been previously reported in the literature. The complete solutions for both unipolar and bipolar switching patterns to eliminate the fifth and seventh harmonics are given. Finally, the unipolar case is again considered where the fifth, seventh, 11th, and 13th harmonics are eliminated along with corroborative experimental results.
309 citations