Flexible Transmission in the Smart Grid: Optimal Transmission Switching

Hedman, Kory W.; Oren, Shmuel S.; O’Neill, Richard P.

doi:10.1007/978-3-642-23193-3_21

Cited by 8 publications

(16 citation statements)

References 25 publications

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“…The first objective (1) indicates that this model is to minimize the overall generation cost of the final network. Objective (2) refers to minimization of the total transition time.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The objective of TS is usually designed as minimization of overall generation cost, i.e. (1). Such an objective can be easily changed to others as needed.…”

Section: Decomposition Strategymentioning

confidence: 99%

“…Conventionally, the branches and bus-bars of transmission network are characterized as fixed assets during system operation. However, as described in [1], ''the redundancy built into the transmission network in order to handle a multitude of contingencies over a long planning horizon can, in the short run, increase operating costs''. In recent years, the proportion of renewable energies including wind and photovoltaic is growing rapidly on the supply side [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Network transition security for transmission switching

Tian

Wang

et al. 2019

J. Mod. Power Syst. Clean Energy

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The smart grid with flexible topologies receives intensive attention recently. Transmission switching (TS) alters the power system topology during operation, and has been demonstrated for the advantage of economic and secure operation of power systems. TS includes a chain of sequential switching actions which bring disturbances to the system if the switching actions are not properly designed. Unfortunately, it is not considered or well-studied in existing works. In this paper, a new multi-period TS model that considers the transition security and a two-stage iterative method are proposed. In the TS model, we take into account the fact that only one line is permitted to switch up or down at a time and the security of each switching action is considered. The proposed iterative solution makes the TS model more tractable under AC framework. Case studies on a 6-bus system and the IEEE 57-bus test system have varified the effectiveness of the proposed model. Numerical results show that: À the consideration of transition security of TS is essential;`the transition path is directly related to secure and fast the transmission switching;´the proposed model and solution method give an effective way to determine the switching sequence and switching timing under transition security criteria.

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“…The first objective (1) indicates that this model is to minimize the overall generation cost of the final network. Objective (2) refers to minimization of the total transition time.…”

Section: Problem Formulationmentioning

confidence: 99%

“…The objective of TS is usually designed as minimization of overall generation cost, i.e. (1). Such an objective can be easily changed to others as needed.…”

Section: Decomposition Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Network transition security for transmission switching

Tian

Wang

et al. 2019

J. Mod. Power Syst. Clean Energy

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“…Constraint (29) describes power balance at every node. Constraints (30) and (31) are the Kirchhoff's laws. If or , the constraints related to Line k are relaxed due to the big number T, which corresponds to the fact that Line k is off service; if and , constraints (30) and (31) have to be strictly satisfied.…”

Section: A Single-period Ots Model With N-1 Securitymentioning

confidence: 99%

“…The switching cost is not considered in the OTS model in most existing research. However, it is essential to investigate and consider the switching cost regarding the prevalence of transmission switching in academic research as well as industrial applications [31]. To elaborately measure the realistic switching cost still needs and is worthy of further research.…”

Section: B Formulation For Ots-scc Modelmentioning

confidence: 99%

Optimal Transmission Switching With Short-Circuit Current Limitation Constraints

Yang

Zhong

Xia

et al. 2016

IEEE Trans. Power Syst.

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With the expansion and enhancement of the power transmission network, short-circuit current (SCC) has become a major concern in grid operations. While transmission switching is one effective solution to reduce the SCC without investing in additional equipment, switching lines could threaten system N-1 security. To find an efficient, and secure, yet economic switching solution, this paper proposes an optimal transmission switching model with SCC limitation and N-1 reliability. As the relationship between SCC and integer variables associated with the line states is coupled, nonlinear and difficult to explicitly express, an effective linearization method is proposed. Theoretical analysis of the linearization error is performed using an illustrative example. Case studies have shown that the linearization error is generally small and decreases rapidly with the increase of electrical distance. Based on the linearized expression for SCC, a transmission switching model with SCC limitation and N-1 reliability constraints is proposed. Furthermore, to assure the calculation accuracy for the SCC, an iterative algorithm is designed to compensate for the linearization error. Case studies on the modified IEEE 30-bus, 118-bus and practically-sized 300-bus systems validate the effectiveness of the proposed model and algorithm. The solving efficiency of the model is investigated and discussed as well.

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Learning-assisted optimization for transmission switching

Pineda,

Morales,

Jiménez-Cordero

2024

TOP

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The design of new strategies that exploit methods from machine learning to facilitate the resolution of challenging and large-scale mathematical optimization problems has recently become an avenue of prolific and promising research. In this paper, we propose a novel learning procedure to assist in the solution of a well-known computationally difficult optimization problem in power systems: The Direct Current Optimal Transmission Switching (DC-OTS) problem. The DC-OTS problem consists in finding the configuration of the power network that results in the cheapest dispatch of the power generating units. With the increasing variability in the operating conditions of power grids, the DC-OTS problem has lately sparked renewed interest, because operational strategies that include topological network changes have proved to be effective and efficient in helping maintain the balance between generation and demand. The DC-OTS problem includes a set of binaries that determine the on/off status of the switchable transmission lines. Therefore, it takes the form of a mixed-integer program, which is NP-hard in general. In this paper, we propose an approach to tackle the DC-OTS problem that leverages known solutions to past instances of the problem to speed up the mixed-integer optimization of a new unseen model. Although our approach does not offer optimality guarantees, a series of numerical experiments run on a real-life power system dataset show that it features a very high success rate in identifying the optimal grid topology (especially when compared to alternative competing heuristics), while rendering remarkable speed-up factors.

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Flexible Transmission in the Smart Grid: Optimal Transmission Switching

Cited by 8 publications

References 25 publications

Network transition security for transmission switching

Network transition security for transmission switching

Optimal Transmission Switching With Short-Circuit Current Limitation Constraints

Learning-assisted optimization for transmission switching

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