The Role of Out-of-Market Corrections in Day-Ahead Scheduling

Al-Abdullah, Yousef M.; Abdi-Khorsand, Mojdeh; Hedman, Kory W.

doi:10.1109/tpwrs.2014.2353647

Cited by 47 publications

(22 citation statements)

References 7 publications

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“…In existing markets, linear approximations of the OPF problems are used instead of the more complex nonlinear formulation due to the limited computational time, market transparency issues, and market pricing issues. Adjustments to this solution, to ensure AC feasibility, are made out-of-market [44]. For a system where generators have constant marginal costs, (1)-(5) present the DCOPF problem:…”

Section: Problem Formulation and Reformulationmentioning

confidence: 99%

“…In order to do that, further research is needed to include an AC model to check the solutions coming out of a DCOPF. Currently, AC feasibility is checked for and achieved via out-ofmarket adjustments [44]. Thus, depending on the application, the check or modification to the FACTS set point can also be done out-of-market to ensure AC feasibility.…”

Section: B Polish System -Winter 2000 Morning Peakmentioning

confidence: 99%

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A Fast LP Approach for Enhanced Utilization of Variable Impedance Based FACTS Devices

Sahraei-Ardakani

Hedman

2016

IEEE Trans. Power Syst.

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Abstract-Transmission systems are under stress and need to be upgraded. Better utilization of the existing grid provides a fast and cheap alternative to building new transmission. One way to improve the utilization of the transmission network is power flow control via flexible AC transmission system (FACTS) devices. While FACTS devices are used today, the utilization of these devices is limited; traditional dispatch models (e.g., security constrained economic dispatch) assume a fixed, static transmission grid even though it is rather flexible. The primary barrier is the complexity that is added to the power flow problem. The mathematical representation of the DC optimal power flow, with the added modeling of FACTS devices, is a nonlinear program (NLP). This paper presents a method to convert this NLP into a mixed-integer linear program (MILP). The MILP is reformulated as a two-stage linear program, which enforces the same sign for the voltage angle differences for the lines equipped with FACTS. While this approximation does not guarantee optimality, more than 98% of the presented empirical results, based on the IEEE 118 bus and Polish system, achieved global optimality. In the case of suboptimal solutions, the savings were still significant and the solution time was dramatically reduced.

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Section: Problem Formulation and Reformulationmentioning

confidence: 99%

Section: B Polish System -Winter 2000 Morning Peakmentioning

confidence: 99%

A Fast LP Approach for Enhanced Utilization of Variable Impedance Based FACTS Devices

Sahraei-Ardakani

Hedman

2016

IEEE Trans. Power Syst.

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“…Similar to the RTS-96 test case, various base-case voltage magnitude and flow violations were found in the PJM power flow solutions, in addition to generators active and reactive power limits violations as well. More out-of-market corrections, [22], were needed to solve the AC power flow cases with constraint relaxations. The reason for the increased out-of-market corrections can be explained by the smaller number of generating units committed in the cases with constraint relaxations compared to the cases with no constraint relaxations resulting in less reactive power availability.…”

Section: Base-case and Post-contingency Feasibilitymentioning

confidence: 99%

Impacts of Constraint Relaxations on Power System Operational Security

Salloum

Al-Abdullah

Vittal

et al. 2016

IEEE Power Energy Technol. Syst. J.

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Constraint relaxations by definition mean that certain constraints are allowed to be violated in energy market models for a pre-determined penalty price. System operators utilize this mechanism in an effort to impose a price-cap on shadow prices in the markets. In addition, constraint relaxations can serve as corrective approximations that help to reduce the occurrence of infeasible or extreme solutions in market models. This work aims to capture the impact constraint relaxations have on AC operating conditions. Moreover, this analysis also provides a better understanding of the correlation between DC market models and AC systems and analyzes how relaxations in market models propagate to system operations. This information can be used to assess the risk associated with constraint relaxations. The practice of constraint relaxations was replicated in this work using a test case and a real-life large-scale system, while capturing both energy market aspects and AC system performance. System performance investigation included static and dynamic security analysis for base-case and post-contingency conditions. Index Terms-Optimal power flow, power generation dispatch, power system economics, power system security, power system simulation, power system stability.

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“…Corrective switching is an alternative to additional reliability-motivated out-ofmarket corrections [8]. With corrective switching, expensive generation re-dispatch can be completely avoided at times or partially reduced by TS via power flow control.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Contingency Analysis With Transmission Switching on Real Power System Data

Sahraei-Ardakani

Balasubramanian

et al. 2016

IEEE Trans. Power Syst.

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Abstract-Transmission switching (TS) has shown to be an effective power flow control tool. TS can reduce the system cost, improve system reliability, and enhance the management of intermittent renewable resources. This paper addresses the state of the art problem of TS by developing an AC-based real-time contingency analysis (RTCA) package with TS. The package is tested on real power system data, taken from energy management systems of PJM, TVA, and ERCOT. The results show that postcontingency corrective switching is a ready to be implemented transformational technology that provides substantial reliability gains. The computational time and the performance of the developed RTCA package, reported in the paper, are promising.

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The Role of Out-of-Market Corrections in Day-Ahead Scheduling

Cited by 47 publications

References 7 publications

A Fast LP Approach for Enhanced Utilization of Variable Impedance Based FACTS Devices

A Fast LP Approach for Enhanced Utilization of Variable Impedance Based FACTS Devices

Impacts of Constraint Relaxations on Power System Operational Security

Real-Time Contingency Analysis With Transmission Switching on Real Power System Data

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