The reduction of control winding series can greatly improve the working efficiency and reduce the design and manufacturing difficulty of CRT(Controllable Reactor of Transformer type).According to the harmonic current requirement of GB/T 14549-93,a more economical grading standard based on the effective value of harmonic current is proposed.On this basis,the relationships among control winding current,control winding series and harmonic current in three kinds of typical single branch operating modes are analyzed.Taking harmonic current as constraint condition,the parameters of control winding series and control winding current are designed in different operation modes,and the parameters of control winding series are compared in the three operation modes.The calculation results show that,when the parameters of control winding are designed according to the grading standard based on the effective value of harmonic current,the control winding series is related to the first control winding current,the limit of kth harmonic current and operation modes.The control winding series under different operating modes are different while the actual harmonic currents of CRT can all meet the requirement in a grid.The harmonic current is the least in the fixed-single-branch operation mode when the first control winding currents are very little difference between three different operation modes.%控制绕组级数的减少对于提高变压器式可控电抗器(CRT)的工作效率、降低设计制造难度具有重要意义.基于国标GB/T 14549-93对谐波电流的要求,提出了更经济的CRT谐波电流有效值分级标准,在此基础上分析了3种典型单支路工作模式下控制绕组电流、控制绕组级数、谐波电流之间的关系,并以谐波电流为约束条件对CRT不同工作模式下的控制绕组级数和各级电流等参数进行设计,同时对3种工作模式的控制绕组级数大小进行比较分析.算例计算结果表明:在基于谐波电流有效值分级标准对CRT控制绕组参数进行设计时,控制绕组级数与第1级控制绕组电流、最大k次谐波电流和工作模式相关,不同工作模式下控制绕组级数不同,但注入电网的谐波电流均能满足要求,且第1级控制绕组电流分配相差不大时,固定单支路工作模式下谐波电流最小.
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