A
            <scp>single‐phase</scp>
            modular multilevel inverter based on controlled
            <scp>DC‐cells</scp>
            under two
            <scp>SPWM</scp>
            techniques for renewable energy applications

Ali, Ahmed; Sayed, Mahmoud A.; Takeshita, Toru; Hassan, Alaaeldien; Azmy, Ahmed M.

doi:10.1002/2050-7038.12599

Cited by 15 publications

(10 citation statements)

References 52 publications

(61 reference statements)

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“…e power loss is smaller when the gain coefficient is larger. ere is a contradiction about n i between equations ( 6) and (8). e system needs to choose an appropriate gain coefficient n i .…”

Section: Analysis Of Power Characteristicmentioning

confidence: 99%

“…is power generation way reduces the problems of voltage loss, power mass defect, power oscillation [5], and power shortage caused by long-distance power transmission [6]. ere must be a large number of electronic interface devices in the microgrid [7], such as inverter [8,9]. us, the inverter and its characteristics have become one of the hotspots of scholars' research [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Improved Fuzzy Voltage Compensation Control Strategy for Parallel Inverter

Song

Liu

Tian

et al. 2022

International Transactions on Electrical Energy Systems

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With the rapid development of microgrids, voltage drop has become one of the focuses on the research of microgrid stability and grid-connected operation. In this article, an improved fuzzy voltage compensation control strategy (FVCC) is proposed to solve the bus voltage drop problem. This method takes the influence of feeder impedance into account, and there is no need to accurately measure the feeder impedance value. Since droop control and feeder impedance can lead to voltage drop and bus voltage instability, fuzzy control is applied to compensate bus voltage. Specifically, aiming at the voltage drop caused by droop control, an adaptive fuzzy controller is designed to automatically find suitable gain parameters to reduce the voltage difference. In addition, bus voltage gain module is added to compensate the voltage consumed by feeder impedance. The compensation only needs to measure the voltage at both ends of the line, without testing the line parameters. Finally, the simulation results show that the control strategy achieves the expected effect.

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Section: Analysis Of Power Characteristicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved Fuzzy Voltage Compensation Control Strategy for Parallel Inverter

Song

Liu

Tian

et al. 2022

International Transactions on Electrical Energy Systems

View full text Add to dashboard Cite

show abstract

“…Additionally, modified inverter topologies are recommended in [14,15,19] that eliminate the DC decoupling capacitor/inductor. However, most of these topologies suffer from a high number of switches and system size, which increases the system cost and reduces the power density [20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Three-Phase PWM Inverter for Isolated Grid-Connected Renewable Energy Applications

2021

Self Cite

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This paper proposes a three-phase isolated flyback inverter (IFBI) for single-stage grid-tied solar PV applications, considering a simple sinusoidal pulse-width modulation (SPWM) scheme. The proposed single-stage inverter employs a reduced passive elements count by considering three input-parallel output-differential (IPOD) flyback converter modules. Additionally, a single small size LC-input low-pass filter is utilized at the input paralleling point for ripple-free input current operation, which is essential in grid-connected renewable energy applications. In addition, a mathematical model of the IFBI is presented to confirm the existence of its low-order harmonic components. A simple PI controller-based control scheme, considering only two loops and five sensors, is used to control the proposed grid-tied IFBI. Continuous modulation scheme (CMS) combined with SPWM is used to diminish the low-frequency harmonic components. Moreover, a simple selective harmonic elimination (SHE) loop is used for second-order harmonic components (SOHC) elimination from grid-injected currents. The SHE has decreased the SOHC from 43% to 0.96%, which improves the grid current THD from 39% to 3.65%, to follow the IEEE harmonic standard limits. Additionally, the harmonic elimination technique decreases the circulating power between the inverter paralleled modules, which enhances the grid currents power factor. The proposed inverter is verified through a grid-connected 200 V, 1.6 kW, 60 Hz experimental prototype, and the switching frequency is 50 kHz. TMS-based DSP controller is used to control the grid-injected power to follow the reference power set-point.

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“…All these merits increase the system's efficiency and enhance the system's reliability. 3,4 The tree of the MLIs has three prominent members; neutral point clamped multilevel inverters (NPCMLIs), flying capacitor multilevel inverters (FCMLIs), and the cascaded H-bridge multilevel inverters (CHBMLIs). [5][6][7][8][9][10] But these primal types of MLIs have some drawbacks.…”

Section: Introductionmentioning

confidence: 99%

“…This results from the features presented through the cascaded connection, which ensures an increase in the voltage level and the number of steps simultaneously. All these merits increase the system's efficiency and enhance the system's reliability 3,4 …”

Section: Introductionmentioning

confidence: 99%