Toward an Online Minimum Number of Controls for Relieving Overloads

Zeng, Lin; Chiang, Hsiao‐Dong

doi:10.1109/tpwrs.2017.2731876

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…For the objective function (11) Only when steel core temperature exceeding the long-term allowable operation temperature T l,limit , the thermal accumulation W steel l,t in safe operation constraint ( 21) of transmission lines is enabled to start to calculate. The judgment factor Y is employed to realize this logical judgment; thus, the calculation equation of…”

Section: Model Optimizationmentioning

confidence: 99%

“…Specific to the overload problem of transmission lines due to power flow transferring after a fault event in power grid, the existing post-contingency power flow control (PPFC) strategies mainly employ measures of adjusting the active power injected into the nodes of the power network (e.g., altering the output of generators and shedding loads) to eliminate the overload conditions of transmission lines. These methods can be classified into two types: (a) sensitivity methods [8]- [11], and (b) optimization control methods [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

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A Post-Contingency Power Flow Control Strategy for AC/DC Hybrid Power Grid Considering the Dynamic Electrothermal Effects of Transmission Lines

Jian

Xiong

et al. 2019

IEEE Access

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The blocking of large-capacity HVDC or the tripping of AC transmission lines by accident will cause power flow transfer sharply and increase the risk of cascading faults in AC/DC hybrid power grid. Therefore, it is needed to take reasonable safety control measures in time to interdict the spreading of the accident. In this paper, a post-contingency power flow control (PPFC) strategy for AC/DC hybrid power grid was proposed. This strategy brings the dynamic electrothermal effects of the conductor into the safety constraints to fully excavate the short-time overload endurance capability of transmission lines, and coordinates the active power adjustment of generators, power transmission adjustment of HVDC, and load shedding measures, to realize the dynamic optimal power flow control in multiple time sections. The proposed optimization control model takes minimum total cost as the objective function, and accounts for the influence of different weather conditions along the transmission lines and load fluctuations after the accident on the electrothermal safety of transmission lines, which can quickly provide the economical and reasonable power flow control scheme, to prevent the AC/DC hybrid power grid from unexpected cascading tripping effectively. Finally, the effectiveness and superiority of the proposed strategy were verified through case studies on the modified IEEE 10-machine 39-node power systems.

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Section: Model Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Post-Contingency Power Flow Control Strategy for AC/DC Hybrid Power Grid Considering the Dynamic Electrothermal Effects of Transmission Lines

Jian

Xiong

et al. 2019

IEEE Access

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“…• First‐order sensitivities of the objective and constraints with respect to controls adjustment [4, 8, 9, 12] or combining such sensitivities and mixed‐integer linear programming (MILP) [4, 8, 9].…”

Section: Introductionmentioning

confidence: 99%

“…OPF‐LNC problems have been approached up to now via various techniques such as • Mathematical programming with complementarity constraints [11]. • First‐order sensitivities of the objective and constraints with respect to controls adjustment [4, 8, 9, 12] or combining such sensitivities and mixed‐integer linear programming (MILP) [4, 8, 9]. • Approximation of the integer constraint limiting the number of control actions via fuzzy continuous non‐linear functions [11, 13] or sigmoid functions [10].…”

Section: Introductionmentioning

confidence: 99%

Suppressing ineffective control actions in optimal power flow problems

Capitanescu

2020

IET Generation Trans & Dist

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Many utilities are still reluctant in adopting optimal power flow (OPF) tools for decision‐making in operation. This paper scrutinizes this issue from the perspective of whether all control actions proposed by an OPF are truly effective to an operator. To this end, the paper focuses on suppressing ineffective control actions in OPF problems. This goal is aligned with the meaning of optimization in practice, that is improvement of operation performance of slightly noisy or imperfectly known real world models. The paper proposes a conceptually different new approach, which computes automatically the number of effective control actions that do not worsen the ideal model OPF objective by more than an operator‐specified tolerance. The proposed approach relies on a three‐step methodology that solves different OPF problems, in which smooth continuous approximation functions are used to convert the benchmark mixed integer nonlinear programming (MINLP) problems into nonlinear programming (NLP) problems. The proposed approach is compared with two other alternatives for the OPF problem of thermal congestion management using three test systems of 60, 118, and 2746 buses, respectively. The results show that, among the competing approaches, the solutions of the proposed continuous approximation lead to the best trade‐off between sub‐optimality and computation speed.

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“…Reactive power optimisation can be solved via a conventional optimal power-flow formulation; however, the number of control actions is often too large to be executed [1]. Various schemes have been proposed for limiting the number of VAR control adjustments [2,3]. The cost of adjusting control devices is taken into account to avoid excessive control actions [4].…”

Section: Introductionmentioning

confidence: 99%