【摘要】：提出了一種采用改進(jìn)的最近電平調(diào)制技術(shù)(nearest level modulation,NLM)的疊加逼近調(diào)制策略,能夠抑制模塊化多電平換流器(modular multilevel converter,MMC)的諧波環(huán)流。首先對基于傳統(tǒng)NLM的MMC進(jìn)行解析分析,指出當(dāng)采用傳統(tǒng)NLM時,上、下橋臂電壓的實(shí)際輸出值與控制器參考電壓之間會出現(xiàn)偏差,且偏差中的二倍頻成分是產(chǎn)生二倍頻環(huán)流的根本原因。據(jù)此,提出了一種疊加逼近調(diào)制策略,使上、下橋臂實(shí)際輸出電壓與參考值一致,并從能量平衡角度論證了當(dāng)采用疊加逼近調(diào)制策略時,橋臂中無二倍頻環(huán)流。以廈門柔直示范工程的電磁暫態(tài)仿真算例驗(yàn)證了所提算法的正確性,為下一步的實(shí)際工程應(yīng)用奠定了基礎(chǔ)。
[Abstract]:A superposition approach modulation strategy based on the improved nearest level modulation technique (nearest level modulation,NLM) is proposed to suppress the harmonic circulation of the modular multilevel converter (modular multilevel converter,MMC). Firstly, the MMC based on traditional NLM is analytically analyzed, and it is pointed out that when the traditional NLM is adopted, the actual output value of the upper and lower arm voltage will deviate from the reference voltage of the controller. The second harmonic component in the deviation is the fundamental cause of the second harmonic circulation. Based on this, a superposition approach modulation strategy is proposed, which makes the actual output voltage of upper and lower arms agree with the reference value. From the angle of energy balance, it is proved that there is no double frequency circulation in the bridge arm when the superposition approximation modulation strategy is adopted. The correctness of the proposed algorithm is verified by an example of electromagnetic transient simulation of the flexible straight demonstration project in Xiamen, which lays a foundation for practical engineering application in the next step.
【作者單位】： 北京交通大學(xué)電氣工程學(xué)院;福建省電力勘測設(shè)計(jì)院;
【基金】：教育部中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目(2014RC030)~~
【分類號】：TM46

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