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A Fault Equivalent Network Based Method for Calculating the Doubly Fed Wind Power Generator Short-circuit Currents

机译：基于故障等效网络的双馈风力发电机短路电流计算方法

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摘要

Current research on short-circuit currents of the doubly fed induction generator is all based on the traditional flux analysis theory. In this article, a novel method to calculate the doubly fed induction generator stator and rotor short-circuit currents is proposed based on the fault equivalent network. First, the fault network is decomposed into a no-fault (normal operation) network and a fault supplementary network. On this basis, considering the influence of the terminal voltage phase jump and the rotor-side converter control, from the perspective of function decoupling, the fault supplementary network is further decomposed into the stator-side fault supplementary network and the rotor-side fault supplementary network. Laplace transformation is then used to calculate the current additions of the two fault supplementary networks. Thus, the analytical expressions of all currents under the grid symmetrical and asymmetrical short circuit could be derived. Finally, both simulation and dynamic experiment results verify that the doubly fed induction generator short-circuit current expressions derived with the proposed method are correct, which facilitates the short-circuit current calculation and relay protection setting of a power grid with a doubly fed induction generator connection.
机译：目前对双馈感应发电机短路电流的研究均基于传统的磁通分析理论。本文提出了一种基于故障等效网络的双馈感应发电机定子和转子短路电流计算方法。首先，将故障网络分解为无故障（正常运行）网络和故障补充网络。在此基础上，考虑端子电压相位跳变和转子侧变流器控制的影响，从功能解耦的角度出发，将故障补充网络进一步分解为定子侧故障补充网络和转子侧故障补充网络。网络。拉普拉斯变换然后用于计算两个故障补充网络的当前相加。因此，可以推导出电网对称和非对称短路下所有电流的解析表达式。最后，仿真和动态实验结果均验证了该方法导出的双馈感应发电机短路电流表达式正确，有利于双馈感应发电机电网的短路电流计算和继电保护设置。连接。

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