Novel Reduced Switch-Count Structure for Symmetric/Asymmetric Cascaded Multilevel Inverter

Seifi, Ali; Hosseinpour, Majid; Dejamkhooy, Abdolmajid; Sedaghati, Farzad

doi:10.1007/s13369-020-04659-4

Cited by 24 publications

(12 citation statements)

References 32 publications

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“…This limitation challenges the application of the proposed structure at high‐voltage levels. However, as a solution to this challenge, the generalized cascaded structure can be utilized similar to that presented in Seifi et al, 1,6 and some other references.…”

Section: Comparing the Proposed Structure With Similar Structuresmentioning

confidence: 99%

“…The advantages of MLI include more sinusoidal waveform output and preferable voltage quality, higher efficiency due to lower switching frequency, reduced dv / dt , lower blocking voltage, enhanced electromagnetic compatibility (EMC), and lower electromagnetic interference (EMI). Also, the reduction of the filter size is another important advantage of MLI that results in lower cost and volume of the output filter 1,2 …”

Section: Introductionmentioning

confidence: 99%

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A generalized diode containing bidirectional topology for multilevel inverter with reduced switches and power loss

Montazer

Olamaei

Hosseinpour

et al. 2021

Circuit Theory & Apps

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Multilevel inverters (MLIs) have made great strides in utilizing renewable energy and industrial applications compared to conventional two‐level inverters in terms of output voltage quality, smaller size of the output filter, and higher efficiency. This paper describes a new diode containing bidirectional topology for single‐phase MLI. This structure is presented to reduce the count of switches, isolated voltage sources, and drivers that can increase the number of output levels modularly. This converter, despite the use of diodes, can feed bidirectionally the low power factor inductive–resistive loads. The proposed structure has been designed to achieve a higher output voltage levels relative to the number of switches, drivers, and direct current (DC) voltage sources. Three different algorithms have been proposed to determine the values of DC voltage sources. To confirm the superiority of the proposed structure, a detailed comparison has been carried out with other MLI topologies. Then the proposed topology is simulated in Matlab/Simulink environment using the nearest level modulation technique. Finally, experimental results are presented to confirm the performance of the designed structure in symmetric and asymmetric topologies.

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Section: Comparing the Proposed Structure With Similar Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A generalized diode containing bidirectional topology for multilevel inverter with reduced switches and power loss

Montazer

Olamaei

Hosseinpour

et al. 2021

Circuit Theory & Apps

Self Cite

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“…The step creation capability of the asymmetric half‐cascaded multilevel inverter has been here compared with other multilevel structures. The voltage step counts in terms of the switch counts for: binary, trinary, and the introduced structures in References 36,61‐63: have been respectively formulated as follows:

N_{Switch, binary} = 4 \frac{italicLn ((), M_{Level} + 1)}{italicLn 2} - 4

N_{Switch, trinary} = 4 \frac{italicLn ((), M_{Level})}{italicLn 3}

N_{Switch, Ref ([], 36)} = 2 {(\frac{1}{3} M_{Level} - \frac{1}{9})}^{\frac{1}{2}} + \frac{true}{23}

N_{Switch, Ref ([], 61)} = 2 \frac{italicLn ((), M_{Level} - 6)}{italicLn 2} + 4

N_{Switch, Ref ([], 62)} = 3 \frac{italicLn ((), M_{Level} + 1)}{italicLn 2} - 2

N_{Switch, Ref ([], 63)} = \frac{5}{24} ((), M_{Level} + 15) + 4

…”

Section: Design and Analysis Of Dynamic Voltage Restorer Based On Lb/sc‐hessmentioning

confidence: 99%

Robust fractional‐order super‐twisting sliding mode control to accurately regulate lithium‐battery / super‐capacitor hybrid energy storage system

Falehi

Torkaman

2021

Int J Energy Res

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Summary One of the main challenges in front of the inventors and researchers to compensate the power quality problems is the existence of an efficient and reliable electric energy source for dynamic voltage restorer (DVR). Recent advances in the technologies of lithium‐battery (LB) and super‐capacitor (SC) have made them possible to be used as hybrid energy storage system (HESS) for DC‐power supply of DVR. But then, a robust and efficient controller must be essentially designed to compensate the intricate correlation between system components, unknown nonlinearities, parameter uncertainties related to the HESS. Hence, fractional‐order super‐twisting sliding mode control (FOSTSMC) is proposed for LB/SC‐HESS to smoothly and accurately smoothly track the current reference and control the DC‐link voltage of the asymmetric half‐cascaded multilevel inverter of DVR during different compensation conditions. As the primary controller, FOSTSMC has compensated the unknown nonlinear parts and parameter uncertainties related to LB/SC‐HESS through the real‐time disturbance estimation using sliding mode state and disturbance observer (SMSDO). Both the battery current and DC‐link voltage due to the physical measurability are chosen to design the control scheme based on the proposed FOSTSMC. The proposed controller has been compared with the proportional integral derivative and the sliding mode control under different probable scenarios to evaluate and validate its observability and controllability. To better present the effects of FOSTSMC, AHCMLI, and HESS‐based DVR, they have been quantified as follows: Three real‐time stability benchmarks that is, overshoot, undershoot and settling time are respectively attained for FOSTSMC: 0.6, 0.4, and 0.03; for sliding mode control: 1.1, 0.7 and 0.019; for proportional integral derivative: 0.9, 2, and 0.117. That is to say, FOSTSMC can smoothly and accurately track the current reference and control the DC‐link voltage during different compensation conditions as compared with other controllers. Asymmetric half‐cascaded multilevel inverter can provide 33 steps with consideration of 12 unidirectional switches, whereas binary, trinary, and other multilevel structures can provide less than 27 steps with consideration of 12 switches. The quasi‐AC voltage synthesizer‐based DVR can completely and accurately compensate the voltage sag and swell with THD of 2.12 and 2.35, respectively. The THD of mal‐compensation voltage sag and swell using the conventional DVR are respectively 11.57 and 13.86.

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“…Multi‐level voltage source inverters (MVSIs) have been applied in a broad range of medium and high voltage applications in recent decades 1 . Compared to traditional two‐level structures, new multilevel converters have several benefits such as high‐quality voltage generation, high output power using low‐rated voltage devices, low switching power loss, lower dv/dt, and low input current distortion 2 .…”

Section: Introductionmentioning

confidence: 99%

An improved switched‐ladder bidirectional multilevel inverter: Topology, operating principle, and implementation

Hosseinpour

Seifi

Babaei

2021

Circuit Theory & Apps

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Multi‐level inverters (MLIs) for medium or high power and voltage utilization have acceptable application in industry and are utilized commercially. The performance of MLIs is considerably preferable to traditional two‐level inverters due to their negligible harmonic content, small filter size, utilization of lower‐rated voltage devices, low electromagnetic interference (EMI), and so on. However, in the face of these many advantages, few disadvantages can be expressed such as more device count and a sophisticated control strategy. This paper presents an improved switched‐ladder topology to enhance the performance of multi‐level inverters by improving the above drawbacks. Compared to existing inverter topologies, the proposed extendable diode‐containing bidirectional structure requires fewer switches and driver circuits. The proposed topology is compared with other similar topologies, and its superiority is examined. Fundamental switching frequency modulation technique is utilized to obtain high‐quality output voltage waveforms with lower harmonic contents and reduced switching losses. This converter, despite the use of diodes, can supply the low power factor inductive‐resistive loads, bidirectionally. To demonstrate the performance of the proposed topology, in addition to simulation with the nearest level modulation technique, a prototype of the proposed structure has been implemented and tested. The results display the proper performance of the proposed topology in the real‐time environment.

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Novel Reduced Switch-Count Structure for Symmetric/Asymmetric Cascaded Multilevel Inverter

Cited by 24 publications

References 32 publications

A generalized diode containing bidirectional topology for multilevel inverter with reduced switches and power loss

A generalized diode containing bidirectional topology for multilevel inverter with reduced switches and power loss

Robust fractional‐order super‐twisting sliding mode control to accurately regulate lithium‐battery / super‐capacitor hybrid energy storage system

An improved switched‐ladder bidirectional multilevel inverter: Topology, operating principle, and implementation

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