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  本文選題：模塊化多電平換流器　切入點：戴維南等效模型　出處：《中國電機工程學報》2016年07期 　論文類型：期刊論文

【摘要】：模塊化多電平換流器(modular multilevel converter,MMC)已經(jīng)展現(xiàn)出極其重要的工程應(yīng)用前景,然而,即使采用超高電平數(shù)的MMC精確等效模型也無法滿足未來直流電網(wǎng)的需求。因此,對MMC高效模型進行相對誤差分析,以尋求滿足特定模型精度和計算效率的等效仿真最佳電平數(shù)具有重要意義。文中以451電平MMC戴維南等效模型為基準,首先提出精確仿真不同電平MMC時的仿真步長計算方法。然后根據(jù)MMC等效模型與詳細模型的仿真誤差,采用基于測量所得客觀權(quán)重的改進層次分析法,將各電氣量的相對誤差整合為該電平數(shù)下MMC的綜合相對誤差。在與基準模型電氣參數(shù)相同的一系列電平數(shù)MMC中,分別仿真和計算得到穩(wěn)態(tài)、交流系統(tǒng)暫態(tài)和直流系統(tǒng)暫態(tài)情況下的相對誤差曲線,同時測量3種工況下各電平數(shù)MMC的仿真用時,采用歸一化方法和曲線擬合,得到各工況下的最佳電平數(shù)。進而利用基于客觀權(quán)重的層次分析法,根據(jù)不同場合對精度和效率的需求,得到不同權(quán)重比下的綜合MMC等效仿真最佳電平數(shù)。最后,通過仿真算例驗證最佳電平數(shù)MMC模型的合理性和有效性
[Abstract]:Modularized multilevel converter (Modular multilevel convertor MMC) has shown a very important prospect in engineering applications. However, even the accurate equivalent model of MMC with ultra high level number can not meet the needs of future DC networks. It is of great significance to analyze the relative error of MMC efficient model in order to find the optimal number of equivalent simulation levels that can satisfy the accuracy and computational efficiency of the specific model. The 451-level MMC Davinan equivalent model is used as the reference in this paper. In this paper, the method of calculating the simulation step size of MMC at different levels is proposed, and then, according to the simulation error between the MMC equivalent model and the detailed model, an improved analytic hierarchy process (AHP) based on the objective weight obtained from the measurement is adopted. The relative error of each electrical quantity is integrated into the comprehensive relative error of MMC at this level number. In a series of level number MMC with the same electrical parameters as the reference model, the steady state is obtained by simulation and calculation, respectively. The relative error curves of AC system transient state and DC system transient state are measured at the same time, and the simulation time of each level number MMC under three operating conditions is measured, and the normalized method and curve fitting are adopted. The optimum level number under different working conditions is obtained, and then the optimal level number of synthetic MMC equivalent simulation under different weight ratio is obtained by using AHP based on objective weight and according to the requirement of accuracy and efficiency in different situations. Finally, The rationality and validity of the optimal level number MMC model are verified by a simulation example.
【作者單位】： 新能源電力系統(tǒng)國家重點實驗室(華北電力大學);國網(wǎng)智能電網(wǎng)研究院;
【基金】：國家863高技術(shù)基金項目(2013AA050105) 中央高校基金(2015XS08) 國家電網(wǎng)公司專項千人計劃支持項目([2014]264號)~~
【分類號】：TM721.1

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本文編號：1589046