Crystal Structure Algorithm (CryStAl) Based Selective Harmonic Elimination Modulation in a Cascaded H-Bridge Multilevel Inverter

Farooqui, Shoeb Azam; Shees, Mohammad Munawar; Alsharekh, Mohammed F.; Alyahya, Saleh; Khan, Rashid Ahmed; Sarwar, Adil; Islam, Muhammad; Khan, Sheroz

doi:10.3390/electronics10243070

Cited by 19 publications

(15 citation statements)

References 20 publications

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“…Generalized quarter-waves of SCM waveform with odd-symmetry, representing the normalized phase voltage waveforms of 3𝜙-MLIs, are presented in Figure 1c,d for odd and even values of N, corresponding to MLI topologies of the cascaded H-bridge (CHB) [15][16][17] and diode-clamped converter (DCC) [18][19][20] phase-legs illustrated in Figure 1a,b, respectively. Both waves in Figure 1 may be generally represented by a unified expression [14]:…”

Section: The Proposed Lthd Expressionmentioning

confidence: 99%

“…zoomed-n window in Figure 8). Using the same data extracted from [9], the ME values were also calculated using Equation (17) and compared against the proposed results, as indicated by Figure 9. These ME results reveal another advantage to using the proposed analytical closed-form expression, in which, unlike the open-form expression used in [9], the ME values remain restricted to the maximum preselected tolerance of 1% throughout the entire feasible range of the modulation index (cf.…”

Section: Validationmentioning

confidence: 99%

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Analytical Expression for Line Voltage THD of Three-Phase Staircase Modulated Multilevel Inverters

2022

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In this article, a simple closed-form analytical expression for the line-voltage total harmonic distortion (LTHD) of three-phase staircase-modulated (SCM) multilevel inverters (MLI) is proposed. The revealed expression is valid for any conventional MLI topology with arbitrary number and parity of voltage levels. The proposed formulation is presented as an analytic function of the number of voltage levels (N) and the phase switching angles (PSA); thus, it is suited to MLIs of equal voltage source supply and of any topology. This function may be employed for accurate LTHD calculation and optimization. The results are verified against LTHD calculations and optimizations, obtained numerically from previous works. Both processor in loop (PIL)- and controller + hardware in loop (C-HIL)-based real-time experimental validations are included as well. A downloadable file containing the Maple and MATLAB functions of the proposed expression are also provided.

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Section: The Proposed Lthd Expressionmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

Analytical Expression for Line Voltage THD of Three-Phase Staircase Modulated Multilevel Inverters

2022

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“…There are different techniques used for harmonic compensators. Some of these are working in a synchronous reference frame while others are in a stationary reference frame [15][16][17][18][19]. Some compensators even operate in a hybrid frame where the current regulators are synchronous, and the compensators are in a stationary reference frame.…”

Section: Introductionmentioning

confidence: 99%

“…Figure19. Results of proposed adaptive harmonic compensator, fixed value harmonic compensator and without harmonic compensator when grid frequency is 49.5 Hz.…”

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confidence: 99%

An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation

et al. 2022

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Background: Grid-tied inverters play an efficient role in the integration of renewable energy resources with utility grids. Motivation: However, the interconnection between power converters and the grid has been seen to be responsible for various stability issues such as weak grid, and under weak grid conditions the injection of power to the grid becomes a challenging task due to continuously varying grid impedance affecting the stability margins as a result. Additionally, the grid impedance-related issues boost the voltage harmonics which further devalue its performance. These voltage harmonics propagate through the Phase-Locked Loop (PLL) circuit to the control unit of the inverter which in turn amplifies the low order harmonics of the inverter. Method: The aim of this research is to introduce a novel strategy that decreases the effect of grid impedance-variations on the performance and stability of an inverter. Hence, an adaptive hybrid mode control technique consisting of two parts is proposed in this research. The current regulator part is implemented in a synchronous reference frame for its gain and time parameters to improve the performance, stability, and response time. The adaptive harmonic compensators are implemented in a stationary reference frame for harmonic compensation purposes. This adaptive nature of harmonic compensator can effectively work in the case of frequency variation where the fixed value based harmonic compensator fails. Results: The adaptive harmonic compensators improve the performance by reducing total harmonic distortion (THD), reduce computation and improve stability when the grid has distorted voltage, variation in grid impedance and frequency. Impact and utility: Our results show that the system becomes less sensitive to grid impedance variations which makes the proposed technique very relevant to the stability performance applications.

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“…Ref. [16] introduces a new algorithm, the Crystal Structure Algorithm (CryStAl). Other approaches that are derivatives of the aforementioned ones can also be used.…”

Section: Introductionmentioning

confidence: 99%

Archimedes Optimization Algorithm Based Selective Harmonic Elimination in a Cascaded H-Bridge Multilevel Inverter

et al. 2021

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This paper presents the Archimedes optimization algorithm to eliminate selective harmonics in a cascaded H-bridge (CHB) multilevel inverter (MLI). The foremost objective of the selective harmonic elimination (SHE) is to eliminate lower order harmonics by finding the optimal switching angle combination which minimizes the objective function containing Total Harmonic Distortion (THD) and other specific harmonic terms. Consequently, the THD is also reduced. In this study, a recently proposed metaheuristic technique named the Archimedes optimization algorithm (AOA) is used to determine the optimal angles corresponding to the 5, 7 and 9 level CHB-MLI. AOA involves equations related to a physical law, the Archimedes Principle. It is based on the idea of a buoyant force acting upward on a body or object that is partially or completely submerged in a fluid, and the upward force is related to the weight of the fluid displaced. This optimization technique has been implemented on CHB-MLI to generate various level outputs, simulated on MATLAB™ R2021a version environment software. The simulation results reveal that AOA is a high-performance optimization technique in terms of convergence speed and exploitation-exploration balance and is well-suited to the solution of the SHE problem. Furthermore, the laboratory validated the simulation result on a hardware setup using DSP-TMS320F28379D.

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Crystal Structure Algorithm (CryStAl) Based Selective Harmonic Elimination Modulation in a Cascaded H-Bridge Multilevel Inverter

Cited by 19 publications

References 20 publications

Analytical Expression for Line Voltage THD of Three-Phase Staircase Modulated Multilevel Inverters

Analytical Expression for Line Voltage THD of Three-Phase Staircase Modulated Multilevel Inverters

An Adaptive Hybrid Control of Grid Tied Inverter for the Reduction of Total Harmonic Distortion and Improvement of Robustness against Grid Impedance Variation

Archimedes Optimization Algorithm Based Selective Harmonic Elimination in a Cascaded H-Bridge Multilevel Inverter

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