Temperature-dependent state estimation based on constrained alternating optimization for three-phase power networks considering transformer parameters

IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
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引用次数: 0

Abstract

This paper presents a three-phase power system state estimation method based on weighted least square criteria in which not only bus voltage phasors but also transformer parameters, i.e. its tap ratio and leakage admittance, as well as overhead transmission line conductor temperatures are considered as state variables. The method integrates the admittance matrix model of three-phase transformers and a weather dependent thermal model of the overhead transmission lines into the power system state estimation process, which is then formulated as a constrained nonlinear optimization problem. A solution technique based on constrained alternating optimization, suitable for the temperature-dependent state estimation considering the transformer’s parameters, is also proposed. The state estimation optimization is divided into two constrained sub-optimization problems, which are solved alternately until convergence conditions are satisfied. A predictor–corrector interior point based algorithm is applied for solving the sub-optimization problems. Several tests on modified IEEE 30-bus and 118-bus systems configured as three-phase test systems indicate that the proposed temperature-dependent state estimation significantly outperforms traditional methods.
基于受限交替优化的三相电网温度相关状态估计(考虑变压器参数
本文提出了一种基于加权最小二乘法准则的三相电力系统状态估计方法,该方法不仅考虑母线电压相位,还将变压器参数(即分接比和漏电导纳)以及架空输电线路导体温度视为状态变量。该方法将三相变压器的导纳矩阵模型和与天气相关的架空输电线路热模型整合到电力系统状态估计过程中,然后将其表述为一个约束非线性优化问题。此外,还提出了一种基于约束交替优化的求解技术,适用于考虑变压器参数的温度相关状态估计。状态估计优化分为两个约束子优化问题,交替求解直至满足收敛条件。在解决子优化问题时,采用了基于预测器-校正器的内点算法。对配置为三相测试系统的改进型 IEEE 30 总线和 118 总线系统进行的多次测试表明,所提出的随温度变化的状态估计方法明显优于传统方法。
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来源期刊
International Journal of Electrical Power & Energy Systems
International Journal of Electrical Power & Energy Systems 工程技术-工程:电子与电气
CiteScore
12.10
自引率
17.30%
发文量
1022
审稿时长
51 days
期刊介绍: The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.
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