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Short circuit network equivalents of systems with inverter-based resources

机译：基于逆变器的资源的系统短路网络等同物

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摘要

Large transmission networks are often represented with short circuit network equivalents to share with neighboring utilities and distribution providers. The computation of network equivalents for short circuit studies is straightforward in systems predominantly based on conventional synchronous generators (SGs). However, the integration of renewable powered plants such as solar and wind parks (WPs) introduces inverter-based resources (IBRs) in the grid with different and nonlinear fault current characteristics. The increasing share of IBRs changes the way power systems respond during disturbances. The application of conventional approach to obtain network equivalents based on the computation of Thevenin equivalent at the point of interest to systems with high share of IBRs will result in misleading short circuit calculations. This paper is the first step in the identification of active nonlinear network equivalents for short circuit studies in systems with IBRs. A new concept of voltage dependent network equivalents (VDNEs) is proposed. Considering the increasing complexity of networks with several and different type of IBR installations, a measurement-based approach using simulated fault currents is proposed to obtain VDNEs. The short-circuit response of VDNEs are validated considering a network with WPs consisting of Type-IV/Full-Size Converter (FSC) wind turbine generators (WTGs).
机译：大型传输网络通常由短路网络等同物表示，以与邻近的公用事业和分发提供商共享。基于传统的同步发电机（SGS），在系统中，在系统中的网络等同物的计算在系统中是简单的。然而，可再生动力设备（如太阳能和风园）（WPS）的集成在网格中引入了基于逆变器的资源（IBRS），具有不同和非线性故障电流特性。 IBRS的越来越多的份额改变了动力系统在干扰期间响应的方式。传统方法基于在IBRS高度份额的感兴趣点的临情点计算的网络等同物的应用将导致误导性短路计算。本文是识别有IBRS系统短路研究的主动非线性网络等同物的第一步。提出了一种新的电压依赖网络等价物（VDNES）的概念。考虑到具有多种和不同类型的IBR安装网络的网络复杂性，提出了一种基于测量的使用模拟故障电流的方法来获得VDNES。考虑使用WPS的网络验证VDNES的短路响应，由IV型/全尺寸转换器（FSC）风力涡轮发电机（WTG）组成。

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