Power System Dynamic State Estimation With Synchronized Phasor Measurements
Power System Dynamic State Estimation With Synchronized Phasor Measurements
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DOI：
10.1109/tim.2013.2278595
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发表时间：
2014-02
影响因子：
5.6
通讯作者：
F. Aminifar;M. Shahidehpour;M. Fotuhi‐Firuzabad;S. Kamalinia
中科院分区：
文献类型：
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作者：
F. Aminifar;M. Shahidehpour;M. Fotuhi‐Firuzabad;S. Kamalinia
将动态状态估计(DSE)应用于含有同步相量测量的电力系统，可以根据测量和预测来估计系统的真实状态。在该应用中，由于相量测量单元(PMU)并不是部署在所有电力系统节点上，状态预测将增强DSE输入数据的冗余性。预测和测量数据在DSE中的重要性受到它们的置信度的影响，而置信度与相应的方差成反比。在实践中，电力系统状态可能在每小时负荷波动、部件停电或网络切换期间发生剧烈变化。在这种情况下，包含预测值可能会降低电力系统状态估计的精度。本文提出了一种DSE的混合整数规划公式，当检测到系统状态的突然变化时，该公式能够同时丢弃预测值。此功能增强了DSE计算，不需要迭代执行。所提出的模型适应了系统范围内PMU的同步测量，这对于智能电网在能源管理系统中的应用可能是有意义的。没有PMU的母线上的电压相量是通过相邻母线的电压和电流测量来计算的，这称为间接测量。测量不确定度表示指南用于根据与PMU测量以及输电线路参数相关的不确定度来计算间接测量的置信度。对一个三节点算例和IEEE 57节点电力系统进行了仿真研究，并对该模型的性能进行了深入的讨论。
The dynamic state estimation (DSE) applied to power systems with synchrophasor measurements would estimate the system's true state based on measurements and predictions. In this application, as phasor measurement units (PMUs) are not deployed at all power system buses, state predictions would enhance the redundancy of DSE input data. The significance of predicted and measured data in DSE is affected by their confidence levels, which are inversely proportional to the corresponding variances. In practice, power system states may undergo drastic changes during hourly load fluctuations, component outages, or network switchings. In such conditions, the inclusion of predicted values could degrade the power system state estimation. This paper presents a mixed-integer programming formulation of DSE that is capable of simultaneously discarding predicted values whenever sudden changes in the system state are detected. This feature enhances the DSE computation and will not require iterative executions. The proposed model accommodates system-wide synchronized measurements of PMUs, which could be of interest to smart grid applications in energy management systems. The voltage phasors at buses without PMUs are calculated via voltage and current measurements of adjacent buses, which are referred to as indirect measurements. The guide to the expression of uncertainty in measurement is used for computing the confidence level of indirect measurements based on uncertainties associated with PMU measurements as well as with transmission line parameters. Simulation studies are conducted on an illustrative three-bus example and the IEEE 57-bus power system, and the performance of the proposed model is thoroughly discussed.