【摘要】：模塊化多電平換流器(modular multilevel converter,MMC)已在直流電網(wǎng)和新能源匯集等領(lǐng)域發(fā)揮重要作用。隨著換流器端數(shù)及MMC中子模塊(submodule,SM)數(shù)目的不斷增加,已有的MMC等效模型在對(duì)由大量超高電平MMC構(gòu)成的多端直流電網(wǎng)仿真時(shí),MMC排序均壓算法的復(fù)雜度將大幅增加,從而導(dǎo)致仿真計(jì)算效率依然較低,仿真用時(shí)明顯增加�；陂_(kāi)關(guān)器件關(guān)斷電阻無(wú)窮大,且使用梯形積分法離散化電容的MMC等效模型,提出了一種線性排序算法。該排序算法的最大時(shí)間復(fù)雜度為2N-3,能有效減少排序運(yùn)算量。通過(guò)理論證明將該排序算法的適用范圍拓展到開(kāi)關(guān)器件關(guān)斷電阻為實(shí)際阻值的MMC等效模型,從而能夠使用該模型仿真子模塊內(nèi)部故障。雖然該線性排序算法是在MMC各子模塊電容容值相等的情況下提出的,但通過(guò)仿真說(shuō)明當(dāng)子模塊電容容值在一合理范圍內(nèi)服從正態(tài)分布時(shí),采用線性排序算法的MMC等效模型在穩(wěn)態(tài)及暫態(tài)工況下依然能夠表現(xiàn)出優(yōu)異的仿真特性。
[Abstract]:Modular multilevel converter (modular multilevel converter,MMC) has played an important role in DC networks and new energy sources. With the increasing number of converters and the number of MMC neutron modules (submodule,SM), the complexity of the MMC sorting equalization algorithm will be greatly increased when the existing MMC equivalent model is used to simulate the multiterminal DC network composed of a large number of super-high MMC. As a result, the efficiency of simulation is still low, and the time of simulation is obviously increased. Based on the MMC equivalent model of switching devices with infinite turn-off resistance and using trapezoidal integration method to discretize the capacitance, a linear sorting algorithm is proposed. The maximum time complexity of this sorting algorithm is 2N-3, which can effectively reduce the amount of sorting operation. It is proved by theory that the applicable range of this sorting algorithm is extended to the equivalent MMC model in which the switch off resistance is the actual resistance, and the model can be used to simulate the internal faults of the sub-module. Although the linear sorting algorithm is proposed under the condition that the capacitance capacity of each submodule of MMC is equal, the simulation results show that the capacitance capacity of the sub-module is normally distributed within a reasonable range. The MMC equivalent model using linear sorting algorithm can still show excellent simulation characteristics under steady and transient conditions.
【作者單位】： 新能源電力系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室(華北電力大學(xué));
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFB0900903) 國(guó)家自然科學(xué)基金項(xiàng)目(51607065)~~
【分類號(hào)】：TM46

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