Simple Three-level Neutral Point Voltage Balance Control Scheme Based on Carrier Overlapping SPWM

• Autorzy: Gong B. , Cheng S. , Qin Y.

Warianty tytułu

PL

Prosta struktura modulacji SPWM z nakładającymi się falami nośnymi do balansowania napięciem punktu neutralnego w przekształtniku trójpoziomowym

• Języki publikacji: EN

Abstrakty

EN

To address the neutral point voltage balance problem of the diode clamped three-level inverter, this paper analyzes the causes of unbalanced neutral point voltage and studies the impact of the carriers overlap on the neutral point voltage. A simple neutral point voltage control scheme using carrier overlapping sinusoidal pulse width modulation (SPWM) is proposed. The proposed scheme does not change the modulation waves, the amplitude of one carrier is increased to overlap the other carrier, and the neutral point voltage can be maintained balance by increasing the carriers amplitudes. The influence of the vertical overlap of carriers on neutral point balance is investigated in depth. The relationship among the neutral point voltage variation, modulation index, overlap of the carriers, and power factor is discussed in this paper. Simulation results show the neutral point voltage balancing control strategy based on SPWM is effective.

PL

W artykule omówiono możliwe przyczyny niezbalansowania napięcia punktu neutralnego w przekształtniku z diodami poziomującymi oraz wpływ na to napięcie nakładania się fal nośnych w modulacji. W przedstawionym schemacie modulacji nakładanie się fal jest wynikiem zwiększenia amplitudy jednej z tych fal. Przedstawiono dyskusję wpływu proponowanej techniki na zmiany napięcia punktu neutralnego oraz zależności między współczynnikiem modulacji, stopniem nakładania się fal i współczynnikiem mocy. Wyniki badań symulacyjnych potwierdzają skuteczność działania.

Słowa kluczowe

EN

three-level inverter; neutral point voltage balancing control; carrier overlapping; SPWM

PL

falownik trójpoziomowy; balansowanie napięciem punktu neutralnego; fala nośna; nakładanie się; SPWM

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2012
• Tom: R. 88, nr 12a
• Strony: 305--309
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Gong B.

autor

Cheng S.

autor

Qin Y.

• Department of Control Science and Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, China,

Bibliografia

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