DC Fault Analysis Models of Three Converter Topologies Considering Control Effects
DC Fault Analysis Models of Three Converter Topologies Considering Control Effects
复制标题
考虑控制效应的三种变流器拓扑直流故障分析模型
DOI：
10.1109/tie.2019.2956376
复制
发表时间：
2020-11
影响因子：
7.7
通讯作者：
Zhao Xu
中科院分区：
文献类型：
--
作者：
Yujun Li;Jiapeng Li;Guihong Wu;Liansong Xiong;Ke Jia;Zhao Xu
现有的转换器模型通常被简化为简化的电气元件，而它忽略了转换器电流控制回路的快速动态的影响。因此，当仿真时间较长时，传统的简化换流器模型的直流故障电流计算变得无效。为了克服这个问题，本文纳入了在过渡过程中的转换器的控制效果，并提出了三个直流故障分析模型的经典的三个换流器的拓扑结构的高压直流（HVDC）的应用，包括线通信换流器（LCC），两电平电压源换流器（VSC），模块化多电平换流器（MMC）。针对LCC整流器直流故障时直流侧电压偏差较大的特点，首先采用最小二乘法对原模型的非线性部分进行线性化，然后将简化线性化模型的比例积分电流调节器等效为RC电路进行直流故障分析。然而，对于两电平VSC或MMC，在瞬态动态过程中，随着大的直流链路电容器放电过程，直流链路电压偏差不会下降那么多。其结果是，原始模型的线性化依赖于基于故障前操作点的小信号方法，和快速内电流环的动态与线性化模型可以表示为RL电路的直流故障电流计算。在不同的故障电阻和直流电抗器、控制参数和运行条件下，以三个换流器为等效RLC电路，对所提出的直流故障分析模型进行了验证。此外，混合高压直流系统的直流故障仿真验证了所提出的转换器模型的有效性。
Existing converter models are normally reduced as simplified electrical components, whereas it overlooks the impacts of fast dynamics of converter current control loops. Therefore, the dc fault current calculation with the traditional simplified converter models becomes invalid when the simulation time is longer. To overcome this problem, this article incorporates the control effects of converters during the transient process and proposes three dc fault analysis models of classical three converter topologies for the high-voltage dc (HVdc) application including line communicated converter (LCC), two-level voltage-source converter (VSC), and modular multilevel converter (MMC). For an LCC-based rectifier, the nonlinear part of original model is first linearized with the least square method due to the large dc-link voltage deviation during dc fault, and the proportional integral (PI) current regulator with the reduced linearized model can be equivalent as an RC circuit for dc fault analysis. However, for two-level VSC or MMC, the dc-link voltage deviation does not drop that much with a large dc-link capacitor discharging process during transient dynamics. As a result, the original model is linearized relying on the small-signal method based on prefault operation points, and the dynamics of fast inner current loop with the linearized model can be represented as an RL circuit for dc fault current calculation. for dc fault analysis The proposed dc fault analysis models of three converters as equivalent RLC circuits are well testified under different fault resistances and dc reactors, control parameters, and operating conditions. Moreover, dc fault simulations of a hybrid HVdc system have verified the effectiveness of the proposed converter models.
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影响因子：
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作者：
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影响因子：
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