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

Xiong Jinfei | Zendy; Zhou Fulin | Zendy; Li Qunzhan | Zendy

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

Author(s) -

Xiong Jinfei,

Zhou Fulin,

Li Qunzhan

Publication year - 2021

Publication title -

iet generation, transmission and distribution

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.92

H-Index - 110

eISSN - 1751-8695

pISSN - 1751-8687

DOI - 10.1049/gtd2.12105

Subject(s) - h bridge , modulation (music) , bridge (graph theory) , inverter , fault (geology) , computer science , electronic engineering , electrical engineering , engineering , voltage , physics , biology , acoustics , paleontology , anatomy

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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