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引用次数: 1
摘要
基于晶闸管的72脉冲门关断电压源变换器(GTO- vsc)拓扑结构以若干个12脉冲的电压源变换器为基本单元，结合GTO栅极控制的基频模式在STATCOM中被广泛应用于电网的动态无功补偿。72脉冲拓扑通常产生包含35次、37次等次谐波的交流输出电压波形，由于总谐波失真(THD)水平较高，难以得到应用。本文在MATLAB环境下，利用Sim Power Systems工具箱，设计并仿真了一种采用6×12-pulse GTO-VSCs、基频门开关、pi控制方法、直流电容作为储能和两级磁体的3电平、72脉冲、500kV、-100MVAr STATCOM的新模型，以衰减35、37、73、75等阶谐波。研究了补偿器在电网中调压和功率因数校正的工作性能，结果表明该模型可用于电力系统。
Digital simulation of 72 pulse GTO based STATCOM for reduced harmonic injection to grid
72-pulse gate turn-off thyristor based voltage source converter (GTO-VSC) topology having a number of 12-pulse VSCs as elementary unit together with fundamental frequency mode of GTO gate control are widely used in STATCOM for dynamic reactive power compensation in electrical network. A 72-pulse topology generally produces an AC output voltage waveforms which contain 35th, 37th, etc. harmonics and hardly find its application due to higher total harmonic distortion (THD) level. In this paper, a new model of 3-level, 72-pulse, 500kV, -100MVAr STATCOM employing 6×12-pulse GTO-VSCs, fundamental frequency gate switching, PI-control methodology, DC capacitor as an energy storage and two stages of magnetics is designed and simulated to attenuate harmonics of the order of 35th, 37th, 73th, 75th etc. by Sim Power Systems toolbox in MATLAB environment. The operating performance of the compensator is studied for regulating voltage and power factor correction in electrical network and results show the model acceptable for power system applications.
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