晶闸管可控电抗器的谐波产生特性研究

Study of the Harmonic Producing Characteristics of the Thyristor Controlled Reactors

基于晶闸管可控电抗器(TCRs)的谐波耦合矩阵模型,对TCRs的谐波产生特性进行了深入分析。TCRs的频域谐波耦合矩阵模型,以完全解析的公式将TCRs端口各次谐波电压和各次谐波电流之间的互耦合和自耦合关系直观地展示出来。通过对矩阵元素的物理意义和取值规律进行研究,分清了在TCRs谐波产生过程中的主要和次要影响因素,进而提出了TCRs的忽略谐波电压共轭影响的模型、解耦的模型和恒流源模型,给出了各简化模型的解析计算公式,并研究了触发延迟角对简化模型精度的影响。分析表明:当触发延迟角小于70°时,简化模型具有较高的精度;当触发延迟角大于70°时,各简化模型都将引入不同程度的误差。研究结论可为工程应用中TCRs谐波源模型的合理选择提供理论参考。

Based on the harmonically coupled matrix model of the Thyristor Controlled Reactors （TCRs）, the harmonic producing characteristics of the TCRs were researched in this paper. The harmonic matrix model gives an obvious illustration of the coupling relationship between the TCRs＇ harmonic voltages and harmonic currents. One of the most significant advantages of the model is that, all the matrix elements are given in an analytical form, which can be used as the basis for the TCRs＇ harmonic producing characteristics analysis. Based on the physical significance and elements variation analysis, the key factors affecting the TCRs harmonic generation have been found out. Furthermore, three simplified models, such as the constant current source model, the Norton equivalent model and the model ignoring the harmonic voltage conjugates, were proposed. Moreover, the simplified model accuracy sensitivity to the firing angle was also analyzed. Study finds out that, when the firing angle is less than 70° , all the simplified models simulation waveforms nearly overlap the waveforms of the accurate model; however, when the firing angle is larger than 70° , all three simplified models bring in some accuracy discrepancies. The contribution of the paper can be used as the theoretical foundation for the future harmonic model selection for the TCRs.