Suzhou Electric Appliance Research Institute
期刊號: CN32-1800/TM| ISSN1007-3175

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模塊化多電平換流器三相橋臂電抗器有限元仿真分析

來源:電工電氣發布時間:2021-08-18 10:18 瀏覽次數:68

模塊化多電平換流器三相橋臂電抗器有限元仿真分析

張志成,張公一,劉凱,謝文剛
(山東泰開高壓開關有限公司,山東 泰安 271000)
 
    摘 要:在模塊化多電平換流器 (MMC) 運行過程中,由于每相橋臂上電容電壓不相等,極易出現橋臂電壓不平衡現象,伴隨著橋臂中直流分量出現三相不相等情況,極易導致三相電抗器中其中一相偏磁過大,造成三相橋臂中電流不平衡,內部出現零序環流,該環流進入直流側加劇直流側電壓、電流及功率的波動。利用有限元仿真軟件搭建 MMC 解耦后的直流側等效電路,針對三相鐵芯橋臂電抗器輸入和輸出特性進行電磁場瞬態仿真,通過在磁芯上引入非線性 B-H 曲線效果,計算了電磁場空間分布和磁飽和效應等,分析在 MMC 三相橋臂中直流分量分布不同工況下對各相電感量及直流側電流波動特性的影響,為 MMC 三相橋臂電抗器的設計及選擇提供了參考。
    關鍵詞:模塊化多電平換流器(MMC) ;橋臂電抗器;直流分量;電流波動
    中圖分類號:TM46 ;TM47     文獻標識碼:A     文章編號:1007-3175(2021)08-0024-05
 
Finite Element Simulation Analysis of Three-Phase Bridge Arm Reactor of MMC
 
ZHANG Zhi-cheng, ZHANG Gong-yi, LIU Kai, XIE Wen-gang
(Shandong Taikai High Voltage Switchgear Co., Ltd, Taian 271000, China)
 
    Abstract: During the operating of modular multilevel converter (MMC), the unequal capacitance voltage on every phase of the bridge arm usually causes unbalanced voltage. Due to the unequal three-phase DC component in bridge arms, the unbalanced DC component is easily to cause one phase the excessive magnetic bias in the three-phase reactor, and results in the inside zero-sequence circulating current, which could flow in DC side to intensify the fluctuation of voltage, current and power. In this paper, finite element modelling is utilized to develop an equivalent DC circuit and to simulate the transient electromagnet field according to the input and output characteristics of three-phase bridge arm reactor. Then, the distribution of electromagnet field and the saturation magnetization are analyzed by setting a simulated nonlinear B-H curve in magnetic core. As a result, the effects of MMC on the inductance and the fluctuation of current on DC side under different distribution of DC component are concluded, which could contribute to the design and selection of three-phase bridge arm reactor for MMC.
    Key words: modular multilevel converter (MMC); bridge arm reactor; DC component; fluctuation of current
 
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