Control strategy of single-phase 3LNPC-CR

Lin, Xiaolan; Xu, Peng; Han, Pengcheng; He, Xiaoqiong; Shu, Zeliang; Gao, Shibin

doi:10.1109/ifeec.2017.7992190

Cited by 2 publications

(2 citation statements)

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“…It was well developed during the 1990s and attracted more interest after 1997 [19], [20]. During the past decades, scholars and engineers have carried out many meaningful studies about CHBI which can be concluded as the following three aspects: 1) improving the harmonic performance [21][22][23]; 2) solving the computational burden to improve the dynamic response [24][25][26]; 3) balancing the DC voltage and developing fault-tolerant control (detection, isolation and reconfiguration) to improve system reliability, maintainability and survivability [27][28][29][30][31][32][33][34][35][36]. Especially for the third aspect, the hardware redundancy and software redundancy [37] are the two efficient and main stream solutions.…”

Section: Introductionmentioning

confidence: 99%

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Soft‐switching modulation of the multilevel cascaded H‐bridge inverter under DC source fault

Xiong

Zhou

2021

IET Generation Trans & Dist

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Cascaded H‐bridge inverter (CHBI) is widely used in the industry application for its outstanding features. However, CHBI needs a large number of isolated DC sources. If some of the DC sources are out of work, the DC voltage cannot maintain the desired value and even decreases to zero, thus degrading the quality of the output voltage of the CHBI. Thus, a soft‐switching modulation strategy based on the carrier phase shift SPWM is proposed in this paper to cope with the DC source failure. The strategy is proposed to achieve two goals: 1) one is to adjust the DC voltage of faulty cells back to the normal; 2) the other one is to make the pulse width modulation (PWM) pulses of each cell change without cell voltage level‐skip. The correction and efficiency are verified by a prototype of three‐cell CHBI built in the laboratory.

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Section: Introductionmentioning

confidence: 99%

“…However, the method is not suitable for CHBC due to its special structure. In [30], a modified control strategy based on a CHB rectifier is proposed to solve the unbalanced DC voltage. The cost function and mathematical model are established in the control strategy.…”

Section: Introductionmentioning

confidence: 99%