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当选择电容电压作为同步信号时 ,可控串被 (TCSC)的暂态过程会出现明显的超调和振荡 ,对于这一现象 ,前人还从未给出相应的机理解释。该文以晶闸管导通角为建模对象 ,采用拓扑建模法建立了能描述电容电压同步下TCSC暂态特性变化规律的二阶差分数学模型。借助该模型可分析影响暂态过程的相关因素 ,进而从本质上揭示了电容电压同步下TCSC的暂态机理。数字仿真结果验证了所建模型的正确性。
When the capacitor voltage is selected as the synchronization signal, there is obvious overshoot and oscillation in the transient process of the TCSC. For this phenomenon, no explanation of the mechanism has been given. In this paper, the thyristor conduction angle is modeled as a second-order differential mathematical model that can describe the variation of transient characteristics of TCSC under the capacitive voltage synchronization using topology modeling method. The model can be used to analyze the relevant factors that affect the transient process, and then reveal the transient mechanism of TCSC under the capacitor voltage synchronization. The numerical simulation results verify the correctness of the model.