中文摘要：

晶闸管投切电容器（ TSC）投入后的暂态电流包含基波稳态分量和衰减的谐波分量。通过对谐波电流峰值求极小值点，得到使TSC电流的谐波分量最小的投入策略，从理论上验证相关文献关于TSC触发时刻选择的论述，分析谐波电流峰值与电容器初始电压之间的关系，得出将电容器充电到峰值并在晶闸管电压过零点触发可使谐波电流充分小的结论。

英文摘要：

The transient current contains a fundamental component and a decaying harmonic component in the switching process of TSC.In this paper, the harmonic term is optimized and the optimal switching strategy is derived.Thus, the switching strategy discussed in related reference is verified. The relationship between the peak value of the harmonic term and the predetermined value of the capacitor voltage is analyzed.It is shown that if the capacitor is charged to the peak value of the system voltage and thyristors are triggered at its zero-crossing point, the peak value of harmonic current is small enough.