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首页> 外文期刊>International review of electrical engineering >Load Shedding in Power Systems Based on a Fuzzy Logic Decision and Sensibility of Stability Prediction and Fast Voltage Indices
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Load Shedding in Power Systems Based on a Fuzzy Logic Decision and Sensibility of Stability Prediction and Fast Voltage Indices

机译：基于模糊逻辑决策和稳定性预测及快速电压指标敏感性的电力系统减载

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摘要

Current and traditional methods of load shedding are based on threshold values of frequency and voltage; thus, when the power system falls below these values, some mechanical control actions are activated as countermeasure against stability problems. Nevertheless, in many cases the traditional mitigation methods based on load shedding cannot ensure that the network remains in continuous operation after the presence of suddenly and severe perturbations. In addition, the development of control systems of wide area based on PMU's measurements has allowed the development of different kinds of indices for the stability prediction. Thus, on-line diagnosis of the power system about angular stability and voltage stability gives better information about the system's situational awareness. This paper proposes a methodology that allows the system operator to take a decision if applying the load shedding as a countermeasure for system instabilities caused by severe contingencies. In addition, the methodology identifies which are the nodes where the load shedding must be applied and the quantity of load shedding to be applied. The proposed load shedding methodology is based on a fuzzy logic decision method using the stability prediction index (SPI) and fast voltage stability index (FVSI). These indices can be computed on-line and they give the stability status of several operating areas. The methodology is tested on the NYPP-NETS of 68 nodes and it is illustrated with a cascade.
机译：当前和传统的减载方法是基于频率和电压的阈值。因此，当电力系统降至这些值以下时，一些机械控制动作将被激活，以应对稳定性问题。然而，在许多情况下，基于减载的传统缓解方法无法确保网络在出现突然和严重的扰动后仍保持连续运行。此外，基于PMU的测量结果开发的广域控制系统还允许开发用于稳定性预测的各种指标。因此，对电力系统进行角度稳定性和电压稳定性的在线诊断可提供有关系统状态感知的更好信息。本文提出了一种方法，允许系统操作员确定是否采用减载作为严重突发事件导致的系统不稳定的对策。另外，该方法确定哪些节点必须应用减载和要应用的减载量。所提出的减载方法是基于使用稳定性预测指数（SPI）和快速电压稳定性指数（FVSI）的模糊逻辑决策方法。这些指标可以在线计算，并给出多个操作区域的稳定性状态。该方法在68个节点的NYPP-NETS上进行了测试，并通过级联进行了说明。

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