Impedance Modeling of Three-Phase Voltage Source Converters in DQ, Sequence, and Phasor Domains
Impedance Modeling of Three-Phase Voltage Source Converters in DQ, Sequence, and Phasor Domains
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DOI：
10.1109/tec.2017.2698202
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发表时间：
2017-04
影响因子：
4.9
通讯作者：
Shahil Shah;L. Parsa
中科院分区：
文献类型：
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作者：
Shahil Shah;L. Parsa
本文提出了一种模块化的方法来表示的VSC动态使用三乘三的传递矩阵在dq，序列和相量域的三相电压源型变换器（VSC）的阻抗建模。传递矩阵形式通过分别对交流侧和直流侧动态进行建模，并描述独立于交流侧和直流侧网络的VSC动态，简化了建模过程。它还明确地捕获非对角元件中的交流和直流侧电压和电流的主频率分量之间的耦合。VSC交流和直流侧阻抗的建模，包括网络对VSC另一侧的影响，提出了使用传输矩阵模型。基于传递矩阵的阻抗建模在三个域和几个稳定性分析的案例研究，在海上风电场基于VSC的HVDC站。结果表明，交流和直流网络之间的耦合，以及三相量的正序和负序分量之间的耦合，在VSC的低频稳定性中起着重要的作用。阻抗模型和稳定性分析预测验证使用风电场模拟。
This paper presents a modular approach for the impedance modeling of three-phase voltage source converters (VSC) by representing the VSC dynamics using three-by-three transfer matrix in the dq, sequence, and phasor domains. The transfer matrix form simplifies the modeling process by separately modeling the ac and dc side dynamics, and describing the VSC dynamics independent of the ac and dc side networks. It also explicitly captures coupling among the dominant frequency components of the ac and dc side voltages and currents in the off-diagonal elements. Modeling of the VSC ac and dc side impedances, including the effects of the network on the other side of the VSC, is presented using the transfer matrix models. Transfer matrix based impedance modeling in the three domains and several stability analysis case studies are presented for a VSC-based HVDC station in an offshore wind farm. It is shown that the coupling between the ac and dc networks, and between the positive and negative sequence components of the three-phase quantities, play an important role in the low-frequency stability of the VSC. Impedance models and stability analysis predictions are validated using the wind farm simulations.