MMC-HVDC换流器阻抗频率特性分析

发布时间：2018-01-19 13:42

本文关键词： 模块化多电平换流器时域仿真阻抗频率特性测试信号法　出处：《中国电机工程学报》2014年24期 　论文类型：期刊论文

【摘要】：分析模块化多电平换流器(modular multilevel converter,MMC)交直流侧呈现的阻抗频率特性是系统设计的重要内容。首先根据MMC的基本运行机理和连续模型,推导交直流侧阻抗的等效表达公式;然后提出基于测试信号法的阻抗计算方法和详细实现流程;最后利用PSCAD/EMTDC对典型系统进行仿真计算。结果表明:1)在电压源激励和电流源激励下所呈现的交流侧阻抗特性不同,而直流侧阻抗特性一致;2)交流侧阻抗特性难以利用无源元件简单串并联模拟,而直流侧阻抗可等效为单调谐滤波器;3)稳态运行点变化对交直流侧阻抗几乎没有影响;4)不同控制模式下交直流阻抗特性曲线基本趋势一致,主要在低频范围内略有不同。
[Abstract]:The analysis of modular multilevel converter (modular multilevel converter, MMC) AC impedance frequency characteristics of the DC side is an important part of the system design. According to the basic operation mechanism of MMC and the continuous model, the equivalent impedance of AC and DC derived formula; then a detailed implementation method and process of computing the impedance test signal method based on the simulation calculation by using PSCAD/EMTDC; finally, the typical system. The results show that: 1) the AC impedance characteristics presented in voltage source and current source under different excitation, and the DC side impedance characteristics; 2) AC impedance characteristics of passive components to use the simple serial parallel simulation, and the DC side impedance equivalent to a single tuned filter; 3) has almost no effect on the steady-state operation point impedance changes on the AC and DC side; 4) under different control modes to the basic trend curve of impedance characteristics of DC line, the main In the low frequency range has a little different.

【作者单位】：浙江大学电气工程学院;
【基金】：国家863高技术基金项目(2012AA050205)~~
【分类号】：TM721.1
【正文快照】： 0引言在直流输电系统中,交直流系统之间存在相互影响和耦合,任意一侧的扰动如果接近换流器或直流回路的固有谐振频率,都有可能因谐波传递、放大而引起系统振荡和设备损坏[1-4]。因此,有必要研究换流器的阻抗频率特性。目前对于传统晶闸管换流器交直流侧等值阻抗的计算和分析已

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