变压器式可控并联高压电抗器的稳态建模

摘要

详细讨论了变压器式可控并联高压电抗器(CSRT)的工作原理,深入分析了CSRT各低压控制绕组之间的耦合关系,并在此基础上建立了CSRT等值阻抗的稳态数学模型,该模型仅含有实验易获取的变压器漏抗参数.利用本文的数学模型,计算了某变压器式可控并联高压电抗器等值电抗与触发角、控制绕组数的定量表达关系,验证了CSRT电抗可连续调节的特性.另外,从实际超高压电网的可控高抗工程应用角度,分析了特殊故障引起安控动作之后轻载运行电压高的问题,并研究了可控高抗投入对系统母线电压水平和关键断面传输功率的影响.%The paper discusses the working principle of controllable shunt reactor of transformer type (CSRT) in detail,analyzes the relationship between low voltage controllable windings,and establishes the steady state mathematical model of the equivalent impedance of the CSRT,which contains only easily available transformer leakage reactance parameters.According to the proposed mathematical model,the paper calculates the equivalent reactance of the CSRT with quantitative relationship to firing angle and the number of switched windings,verifying the characteristic of the CSRT that its reactance can be adjusted continuously.In addition,from the viewpoint of engineering application of the CSRT in actual ultra-high voltage power grid,the paper analyzes high operation voltage problem under light load condition induced by the operation of security and stability control device after some special faults,and investigates the influence of the CSRT on the system bus voltage level and the transmission power of some key transmission sections.