开发基于平方根立方卡尔曼滤波器的解决方案,用于改进具有未知输入和非高斯噪声的电力系统状态估计

IF 4.8 2区 工程技术 Q2 ENERGY & FUELS Sustainable Energy Grids & Networks Pub Date : 2024-09-11 DOI:10.1016/j.segan.2024.101523
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引用次数: 0

摘要

了解电力系统瞬息万变的动态变化至关重要,而动态状态估计(DSE)在实现这一目标方面发挥着重要作用。然而,传统的非线性卡尔曼滤波器(NKF)面临着种种限制:无法获得控制输入以及测量中存在非高斯噪声,这些都影响了其准确性和鲁棒性。这项研究引入了一种新型稳健的 DSE 方法,以应对这些挑战。它首次在 DSE 中利用 Holt-Winters 三重指数平滑法的预测能力,对控制输入的时变行为进行建模。这种创新方法允许同时估计动态状态变量(如转子角度和转子速度变化)以及瞬态电压和控制输入(如机械输入扭矩和励磁电压),即使在存在非高斯噪声的情况下也是如此。此外,该方法还采用了改进的投影统计和考奇函数。这种独特的组合有效地限制了观测异常值的影响,同时保持了较高的统计估计效率。这种创新方法利用平方立方卡尔曼滤波器(SCKF)来增强数值稳定性。在各种异常条件下进行的大量仿真证明,该方法在估计状态向量方面具有卓越的准确性和效率。这些结果彰显了该方法显著改善电力系统估算的潜力,并为实时应用铺平了道路。
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Developed square-root cubature Kalman filter-based solution for improving power system state estimation with unknown inputs and non-Gaussian noise

Understanding the ever-changing dynamics of power systems is crucial, and dynamic state estimation (DSE) plays a vital role in achieving this. However, traditional nonlinear Kalman filters (NKFs) face limitations: lack of access to control inputs and presence of non-Gaussian noise in measurements, impacting their accuracy and robustness. This research introduces a novel robust DSE method that tackles these challenges head-on. For the first time in DSE, it leverages the predictive power of Holt-Winters Triple Exponential Smoothing to model the time-varying behavior of control inputs. This innovative approach allows for the simultaneous estimation of dynamic state variables such as the rotor angle and rotor speed changes, as well as transient voltages and control inputs like mechanical input torque and excitation voltage, even in the presence of non-Gaussian noise. Furthermore, the method employs modified projection statistics and a Cauchy function. This unique combination effectively bounds the influence of observation outliers while maintaining high statistical estimation efficiency. This innovative approach utilizes a square cubature Kalman filter (SCKF) for enhanced numerical stability. Extensive simulations under various anomalous conditions demonstrate the method's superior accuracy and efficiency in estimating the state vector. These results highlight its potential to significantly improve power system estimation and pave the way for real-time applications.

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来源期刊
Sustainable Energy Grids & Networks
Sustainable Energy Grids & Networks Energy-Energy Engineering and Power Technology
CiteScore
7.90
自引率
13.00%
发文量
206
审稿时长
49 days
期刊介绍: Sustainable Energy, Grids and Networks (SEGAN)is an international peer-reviewed publication for theoretical and applied research dealing with energy, information grids and power networks, including smart grids from super to micro grid scales. SEGAN welcomes papers describing fundamental advances in mathematical, statistical or computational methods with application to power and energy systems, as well as papers on applications, computation and modeling in the areas of electrical and energy systems with coupled information and communication technologies.
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