为满足速度控制和张力控制的优化，张力控制可采用主速度辊控制、直接张力控制、间接张力控制。
To meet the speed control and tension control optimization, tension control can use master speed roller control, direct tension control, tension control indirectly.
另外，论文总结了电流间接控制和电流直接控制这两种控制方法，分析了各自的优缺点。
In addition, several typical control methods are summarized and their advantages and disadvantages are analyzed.
本文首先研究了DSTATCOM的基本工作原理，建立了其数学模型，比较了直接电流控制和间接电流控制两种常用的控制方法。
The basic working principle of the DSTATCOM is studied and its mathematical model is established in this paper. The direct current control and indirect current control are compared in this paper.
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