变压器式可控电抗器的谐波分析和功率级数计算

HARMONIC CURRENT AND POWER-STEP NUMBER OF CONTROLLABLE SHUNTING REACTORS OF TRANSFORMER TYPE

阐述了变压器式可控并联电抗器CSRT(Controllable Shunt Reactor of Transformer Type)的基本工作原理,指出 CSRT 本质上是工作于分级短路状态的多绕组变压器,具有功率连续平滑可调、谐波电流小和响应速度快的优点。文章定义了容量递增系数,当CSRT的额定容量已知时,级间容量递增系数决定了各级容量,是分析CSRT的一个重要概念。在考虑了绕组之间耦合的情况下,应用傅立叶级数分解方法对工作绕组电流的谐波含量进行了分析,推导了谐波因数的计算公式。这些公式揭示了谐波因数与容量递增系数和晶闸管触发角之间的定量关系,由此可得到满足电网谐波要求的功率控制级数和各级容量的计算公式,为CSRT的分析、设计打下了基础。

The basic structure and the principle of a controllable shunting reactor of transformer type (CSRT) are described in this paper.It points out that CSRT,in nature,is a multi-winding transformer with stepping short-circutied secondary windings,and has many virtues such as smooth power regulating,smaller high harmonic contents,and rapid response speed.The reactive power increment coefficient is defined in the paper.It puts forward that the reactive power increment coefficient is an important concept for designing CSRT because it determines each power step when the rated reactive power is given.Considering the magnetic coupling between the windings,the harmonic components of working current are analyzed and the formulae for computing the harmonic current factor are derived using Fourier Method.These formulae demonstrate the quantitative relation between the harmonic current factor and the power increment coefficient,and are very important for calculating power-step number and each power step in CSRT design with limited high harmonic level..