Hybrid cascaded H-bridge inverter with even power distribution and improved total harmonic distortion: analysis and experimental validation

Ghoreishy, Hoda; Varjani, Ali Yazdian; Farhangi, Shahrokh; Mohamadian, Mustafa

doi:10.1049/iet-pel.2012.0111

Cited by 29 publications

(37 citation statements)

References 25 publications

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“…This section presents the optimization solutions (optimized value of DC voltage sources and optimized switching angle) obtained for SHE‐PWM scheme, prior SHM‐PWM scheme proposed in Ghoreishy et al, and proposed SHM‐PWM scheme for a three‐phase seven‐level CHB inverter.…”

Section: Optimization Resultsmentioning

confidence: 99%

“…This section discusses the formulation of fitness functions for SHE‐PWM scheme, prior SHM‐PWM scheme proposed in Ghoreishy et al and proposed SHM‐PWM scheme for a three‐phase seven‐level CHB inverter.…”

Section: Mathematical Formulation Of Fitness Functionsmentioning

confidence: 99%

“…The fitness function and its associated constraints for prior SHM‐PWM scheme are given as follows:

\begin{matrix} lefttrue \\ F_{1} = \begin{array}{c} min \\ ((),,,,,, λ_{1}, λ_{2}, λ_{3}, v_{1}, v_{2}, v_{3}) \end{array} \{s + t + u + v\} \\ where s = {((), B^{d} - B_{1})}^{2} \\ t = \sum_{n = 1}^{3} {((), B_{((), 6 h - 1)})}^{2} + \sum_{h = 1}^{2} {((), B_{((), 6 h + 1)})}^{2} \\ u = {((), v_{1} \cos ((), λ_{1}) - v_{2} \cos ((), λ_{2}))}^{2} \\ v = {((), v_{1} \cos ((), λ_{1}) - v_{3} \cos ((), λ_{3}))}^{2} \\ Subject to λ_{1} > θ / 2, \\ π / 2 - λ_{3} = θ, \\ λ_{i} - λ_{i - 1} > θ / 2, w here θ is taken as 0.01 rad \\ and 0 \leq v_{i} \leq 1 p . u . (i ϵ 1, 2, 3) . \end{matrix}

…”

Section: Mathematical Formulation Of Fitness Functionsmentioning

confidence: 99%

“…Moreover, the effectiveness of the proposed scheme over conventional SHE‐PWM scheme (presented in Kundu et al) and SHM‐PWM scheme (presented in Ghoreishy et al) has been established by simulation and experimentation. Furthermore, a comparison has been carried out to prove the supremacy of the proposed modulation schemes over the previously proposed modulation schemes, in terms of the switching instances requirement for the fulfillment of two grid codes CIGRE WG 36‐05 and EN 50160 for the three‐phase system.…”

Section: Introductionmentioning

confidence: 99%

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An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

Kundu

Banerjee

2019

Int Trans Electr Energ Syst

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Summary This paper presents an improved selective harmonic minimization (SHM)‐pulse width modulation (PWM) scheme using three‐phase seven‐level cascaded H‐bridge (CHB) inverter suitable for medium‐voltage distribution systems by achieving high‐quality voltage waveform with least number of switching instances (ie, each power semiconductor devices switched once in a quarter period). Here, each isolated DC voltage sources have been taken as variable and unequal for the CHB inverter. The efficacy of the proposed SHM‐PWM scheme over selective harmonic elimination (SHE)‐PWM scheme and existing SHM‐PWM scheme has been verified through a comparative inverter performance analysis with equal number of switching instances. Both simulation and experimental results prove that the proposed SHM‐PWM scheme ensures equal percentage of power‐sharing between the H‐bridge cells, achieves desired fundamental voltage component, minimizes each individual odd nontriplen harmonics, and limits %total harmonic distortion (THD) up to 25th‐order harmonics such that, it satisfies the power quality standards CIGRE WG 36‐05 and EN 50160 for the entire modulation index range. It is also seen that the proposed scheme requires least no of switching (three) than other reported SHE‐/SHM‐PWM schemes to meet the aforesaid power quality standards. It also results lower inverter losses and improves efficiency compared with conventional schemes. Finally, the scheme is applied to a closed‐loop control of induction motor driven by back‐to‐back PWM‐controlled converter.

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Section: Optimization Resultsmentioning

confidence: 99%

Section: Mathematical Formulation Of Fitness Functionsmentioning

confidence: 99%

“…The fitness function and its associated constraints for prior SHM‐PWM scheme are given as follows:

\begin{matrix} lefttrue \\ F_{1} = \begin{array}{c} min \\ ((),,,,,, λ_{1}, λ_{2}, λ_{3}, v_{1}, v_{2}, v_{3}) \end{array} \{s + t + u + v\} \\ where s = {((), B^{d} - B_{1})}^{2} \\ t = \sum_{n = 1}^{3} {((), B_{((), 6 h - 1)})}^{2} + \sum_{h = 1}^{2} {((), B_{((), 6 h + 1)})}^{2} \\ u = {((), v_{1} \cos ((), λ_{1}) - v_{2} \cos ((), λ_{2}))}^{2} \\ v = {((), v_{1} \cos ((), λ_{1}) - v_{3} \cos ((), λ_{3}))}^{2} \\ Subject to λ_{1} > θ / 2, \\ π / 2 - λ_{3} = θ, \\ λ_{i} - λ_{i - 1} > θ / 2, w here θ is taken as 0.01 rad \\ and 0 \leq v_{i} \leq 1 p . u . (i ϵ 1, 2, 3) . \end{matrix}

…”

Section: Mathematical Formulation Of Fitness Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

Kundu

Banerjee

2019

Int Trans Electr Energ Syst

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“…Besides switching angles, the value of DC input voltage can be considered as an extra degree of freedom in order to find better results without increasing the switching frequency. As a background information, the idea of assuming DC voltage in the equations has been taken into account in two/multilevel SHE/SHM-PWM [24][25][26]. The main objectives in those works have been concentrated on finding more continuous and smoother trajectory for switching angles as well as eliminating more harmonic orders proportional to the number of existing DC sources.…”

mentioning

confidence: 99%

Hybrid SHM-SHE Pulse-Amplitude Modulation for High-Power Four-Leg Inverter

Sharifzadeh

Vahedi

Portillo

et al. 2016

IEEE Trans. Ind. Electron.

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Abstract-This paper presents a hybrid SHM-SHE switching technique based on pulse amplitude modulation (PAM) concept. It has been applied on a 4-leg NPC inverter to eliminate and mitigate more harmonic orders than recently proposed hybrid SHM-SHE-PWM method while generating switching pulses at the same frequency. In conventional SHE and SHM techniques, equations are solved to attain the switching angles. Regarding the PAM, value of inverter DC voltage can be considered as an additional degree of freedom by which the flexibility of such techniques would be increased maintaining the switching frequency. In the proposed SHM-SHE-PAM, the conventional equations are reformulated to obtain constant switching angles for a vast range of modulation index (m a ) applied on a 4-leg NPC inverter. Switching pulses of the 3 phase legs and the 4 th leg are calculated to mitigate the non-triplen harmonics and eliminate the triplen ones, respectively. Due to the unique switching angles valid in the whole range for m a , the calculation time and volume (storage capacity) are significantly reduced leading to a simpler controller implementable on a low risk and cheap AVR Chip. Experimental tests results of a 4-leg NPC inverter as UPS application prove the good dynamic performance and accuracy of the proposed implemented switching technique in producing associated pulses for the inverter switches at very low frequency to mitigate/eliminate undesired harmonic orders from the output phase/line voltage waveforms without using bulky filters.

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Generalized Formulations and Solving Techniques for Selective Harmonic Elimination PWM Strategy: A Review

Rai

Chakravorty

2019

J. Inst. Eng. India Ser. B

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Hybrid cascaded H-bridge inverter with even power distribution and improved total harmonic distortion: analysis and experimental validation

Cited by 29 publications

References 25 publications

An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

An improved SHM‐PWM scheme for three‐phase seven‐level CHB inverter to improve power quality by fulfilling CIGRE WG 36‐05 and EN 50160 and sharing equal power between the H‐bridge cells

Hybrid SHM-SHE Pulse-Amplitude Modulation for High-Power Four-Leg Inverter

Generalized Formulations and Solving Techniques for Selective Harmonic Elimination PWM Strategy: A Review

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