Robust Optimal Power Flow under Renewable Uncertainty with Pairwise Convex Hull and Non-Affine AGC Redispatch Strategy

Zeng, Lin; Chiang, Hsiao-Dong

doi:10.1016/j.epsr.2022.108136

Cited by 6 publications

(7 citation statements)

References 18 publications

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“…The VRE units can operate with a power factor of 0.95 lag to lead [48], and their output power can be curtailed if needed. For VRE uncertainty characterization (21), we use the 1-norm and a scale parameter 𝛤 𝑡 = 𝛥 √ 𝑑 𝑣𝑡 , where 𝛥 is varied from 0 to 1.5, and the covariance matrix for each forecast hour is estimated using exponential smoothing [49] of the same hour over the 30 days prior to the forecasting date. Load uncertainty can be treated in the same manner but is disregarded given the relatively small intrahour load variability.…”

Section: Computational Resultsmentioning

confidence: 99%

“…In contrast, robust optimization assumes no prior knowledge of the uncertainty distribution. Robust optimization has been used to hedge the operations against uncertain power injections from VREs in unit commitment [4,17,18], single-period OPF [19][20][21][22][23], and multiperiod OPF [24,25].…”

Section: Introductionmentioning

confidence: 99%

“…The other computational complexity arises from the nonconvexity of AC power flow equations. Hence, these equations are usually approximated using the DC model [4,8,16,21] and second-order cone (SOCP) and semidefinite (SDP) programming relaxations [12,23,25,26]. The DC model is computationally efficient but neglects power losses and reactive power.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Robust Ac Optimal Power Flow Considering Intrahour Uncertainties

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Section: Computational Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adaptive Robust Ac Optimal Power Flow Considering Intrahour Uncertainties

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Section: State Of the Art Of The Redispatch Models In Real-time Opera...mentioning

confidence: 99%

Redispatch Model for Real-Time Operation with High Solar-Wind Penetration and Its Adaptation to the Ancillary Services Market

Balzer,

Watts

2024

ASI

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Modern electrical power systems integrate renewable generation, with solar generation being one of the pioneers worldwide. In Latin America, the greatest potential and development of solar generation is found in Chile through the National Electric System. However, its energy matrix faces a crisis of drought and reduction of emissions that limits hydroelectric generation and involves the definitive withdrawal of coal generation. The dispatch of these plants is carried out by the system operator, who uses a simplified mechanism, called “economic merit list” and which does not reflect the real costs of the plants to the damage of the operating and marginal cost of the system. This inefficient dispatch scheme fails to optimize the availability of stored gas and its use over time. Therefore, a real-time redispatch model is proposed that minimizes the operation cost function of the power plants, integrating the variable generation cost as a polynomial function of the net specific fuel consumption, adding gas volume stock restrictions and water reservoirs. In addition, the redispatch model uses an innovative “maximum dispatch power” restriction, which depends on the demand associated with the automatic load disconnection scheme due to low frequency. Finally, by testing real simulation cases, the redispatch model manages to optimize the operation and dispatch costs of power plants, allowing the technical barriers of the market to be broken down with the aim of integrating ancillary services in the short term, using the power reserves in primary (PFC), secondary (SCF), and tertiary (TCF) frequency control.

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“…The merit order list redispatch model uses maximum power prices with demand responding to the price between the market equilibrium for both perfect competition and natural monopoly [34]. There are other advances called more specific redispatch submodels and targeting the market for ancillary services applied to automatic generation control (AGC) to maintain frequency and applied to a robust optimal power flow model to integrate renewable energy sources, where the non-affine redispatch constraints are designed so that the power outputs of the AGC units reach their lower or upper limit during redispatch [35]. All robust power dispatch methods based on fixed participation factors adopt the AGC redispatch scheme, due to its relatively easy computational property.…”

Section: The Economic Merit List Is a Basic And Inefficient Mechanism...mentioning

confidence: 99%

Redispatch Model for Real Time Operation with High Solar-Wind Penetration and its Adaptation to the Ancillary Services Market

Balzer,

Watts

2023

Preprint

View full text Add to dashboard Cite

Modern electrical power systems integrate renewable generation, with solar generation being one of the pioneers worldwide. In Latin America, the greatest potential and development of solar generation is found in Chile through the National Electric System. However, its energy matrix faces a crisis of drought and reduction of emissions that limits hydroelectric generation and involves the definitive withdrawal of coal generation. The dispatch of these plants is carried out by the system operator, who uses a simplified mechanism, called “economic merit list” and which does not reflect the real costs of the plants to the damage of the operating and marginal cost of the system. This inefficient dispatch scheme fails to optimize the availability of stored gas and its use over time. Therefore, a real-time redispatch model is proposed that minimizes the operation cost function of the power plants, integrating the variable generation cost as a polynomial function of the net specific fuel consumption, adding gas volume stock restrictions and water reservoirs. In addition, the redispatch model uses an innovative "maximum dispatch power" restriction, which depends on the demand associated with the automatic load disconnection scheme due to low frequency. Finally, by testing real simulation cases, the redispatch model manages to optimize the operation and dispatch costs of power plants, allowing the technical barriers of the market to be broken down with the aim of integrating ancillary services in the short term, using the power reserves in primary (PFC), secondary (SCF), and tertiary (TCF) frequency control.

show abstract

Robust Optimal Power Flow under Renewable Uncertainty with Pairwise Convex Hull and Non-Affine AGC Redispatch Strategy

Cited by 6 publications

References 18 publications

Adaptive Robust Ac Optimal Power Flow Considering Intrahour Uncertainties

Adaptive Robust Ac Optimal Power Flow Considering Intrahour Uncertainties

Redispatch Model for Real-Time Operation with High Solar-Wind Penetration and Its Adaptation to the Ancillary Services Market

Redispatch Model for Real Time Operation with High Solar-Wind Penetration and its Adaptation to the Ancillary Services Market

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