【摘要】：級聯(lián)型多電平逆變器采用載波移相控制可以自然實現(xiàn)各H橋單元功率均衡,開關管開關次數(shù)保持一致,而采用同相層疊控制可得到諧波含量更小的線電壓,但各H橋單元功率不均衡,開關次數(shù)也不一致。本文提出一種結合同相層疊控制和載波移相控制二者優(yōu)點且實現(xiàn)簡單的空間矢量調制策略。通過對電壓矢量進行重新組合劃分,可以將多電平空間矢量控制算法簡化為多個兩電平空間矢量的移相疊加。對載波進行重構,可以實現(xiàn)輸出線電壓諧波更小,同時各H橋單元功率自然實現(xiàn)均衡,開關管開關次數(shù)達到一致。搭建了一臺三相4.5kW的級聯(lián)型五電平逆變器,對所提出的SVPWM策略進行了實驗驗證,實驗結果表明所提出的空間矢量調制策略的有效性。
[Abstract]:The cascaded multilevel inverter can naturally realize the power equalization of each H-bridge unit by using carrier phase-shifting control, and the switching times of the switching tube are consistent, while the line voltage with less harmonic content can be obtained by using the in-phase stacking control. However, the H-bridge unit power is not balanced, the number of switches is also inconsistent. This paper presents a simple space vector modulation strategy which combines the advantages of in-phase stacking control and carrier phase shift control. By recombining and dividing the voltage vectors, the multilevel space vector control algorithm can be simplified as the phase shift superposition of several two-level space vectors. When the carrier is reconstructed, the output line voltage harmonics can be reduced, at the same time, the power of each H-bridge unit can be equalized naturally, and the switching times of the switch tube are consistent. A three-phase 4.5kW cascaded five-level inverter is built and the proposed SVPWM strategy is verified experimentally. The experimental results show the effectiveness of the proposed space vector modulation strategy.
【作者單位】： 華中科技大學強電磁工程與新技術國家重點實驗室;
【基金】：國家自然科學基金重點項目(50837003) 江蘇省333高層次人才培養(yǎng)工程專項(1003-90YPA13002) 臺達電力電子科教發(fā)展計劃(DREG2010010) 中央高�；緲I(yè)務費(2011TS104)資助項目
【分類號】：TM464

【參考文獻】

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