Power system flexibility assessment &amp;#x2014; State of the art

Lannoye, Eamonn; Flynn, Damian; O’Malley, Mark

doi:10.1109/pesgm.2012.6345375

Cited by 33 publications

(26 citation statements)

References 6 publications

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“…Because of (6), the uncertainty in problem (7)-(9) is , which is characterized by a given uncertainty set , where and are a zero and all-ones vectors, respectively, with the same dimension as . As a result, we transform the non-standard robust optimization problem (1)-(3) into a standard robust problem (7)- (9). If the objective function is a linear or concave function, problem (7)-(9) can be solved by using the approaches proposed in [28] and [29] for continuous corrective action such as dispatch and AGC control or, alternatively, the algorithm proposed in [32] for discrete corrective action, such as unit commitment and transmission line switching.…”

Section: Solution Methodologymentioning

confidence: 99%

“…One focuses on long-term planning while the other targets real-time operations. A comprehensive review of the research on both long and short-term flexibility metrics is performed in [9].…”

Section: Introductionmentioning

confidence: 99%

“…Lannoye et al [9] underscore that these constraints actually play a significant role in determining the flexibility of a system. Congestion in the transmission system can lead to a decrease in flexibility of a system, so their inclusion is critical to assessing the overall flexibility of a system.…”

Section: Introductionmentioning

confidence: 99%

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A Unified Framework for Defining and Measuring Flexibility in Power System

Zhao¹,

Zheng²,

Litvinov³

2016

IEEE Trans. Power Syst.

232

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Flexibility is a widely used term in planning process and real-time operation. The existing research on flexibility uses different techniques to study flexibility property from different aspects. While studying a property from various viewpoints increases the understanding on the subject, we need a consistent theoretical framework to consolidate the ideas generated in the field, compare and contrast results, and build on for future analysis. Based on the insights of the nature of flexibility, this paper proposes a unified framework for defining and measuring flexibility in power system. Under the proposed framework, we propose a flexibility metric which evaluates the largest variation range of uncertainty that the system can accommodate. Such a metric takes into account transmission network and system operations constraints, which are critical to assessing flexibility, but are often ignored in literature. A robust optimization technique is used to calculate the proposed metrics. While the illustrative example presented in this paper focuses on the flexibility in real-time system operation in the presence of wind and load uncertainty, this framework can generally be applicable to long-term studies such as system planning.

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Section: Solution Methodologymentioning

confidence: 99%

“…One focuses on long-term planning while the other targets real-time operations. A comprehensive review of the research on both long and short-term flexibility metrics is performed in [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Unified Framework for Defining and Measuring Flexibility in Power System

Zhao¹,

Zheng²,

Litvinov³

2016

IEEE Trans. Power Syst.

232

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show abstract

“…To this date, there are very few methodologies that have been proposed to assess the overall flexibility in power systems. They are surveyed in [43]. The main implication here is that flexibility consideration in long-term planning may change the optimal mix of resources to be invested in [44].…”

Section: Long-term Flexibility Planningmentioning

confidence: 99%

Flexibility Envelopes for Power System Operational Planning

Nosair

Bouffard

2015

IEEE Trans. Sustain. Energy

194

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Operational planning is an integral part of maintaining economic operation of the bulk power system and keeping the lights on. Traditionally, power systems have been designed without ramping capability concerns, such that operational planning needed only focus on capacity adequacy, while assuming sufficient ramping capability. Today, the integration of renewable energy sources has led to increased variability and uncertainty in the power balance, thus warranting the need to carefully assess the ramping adequacy of resources on top of capacity requirements. Moreover, the advent of energy-constrained resources, such as energy storage and demand response, has warranted the need to plan power systems in the face of energy scarcity, in addition to ramping and capacity scarcity. Consequently, traditional operational planning is becoming less capable of handling the new reality of modern sustainable power systems integrating high levels of renewable energy. This has led to the emerging concept of power system flexibility, to emphasize on the need to plan capacity, ramping, and energy altogether. Concurrently, there has also been an increasing interest in stochastic planning to handle the increased uncertainty. That being said, the current state of the art on operational planning remains confined to the traditional thinking, especially when defining operating reserve requirements. To that end, this dissertation proposes a modernization of the concept of operating reserve, in light of the emerging concept of power system flexibility. The concept of a flexibility requirement envelope is introduced to accurately capture the capacity, ramping, and energy requirements arising from variability and uncertainty. Equally, the concept of a flexibility envelope is proposed to capture the capacity, ramping, and energy capability of a power system resource. Adequate system flexibility is asserted when the aggregate flexibility envelope of power system resources encloses the flexibility requirement envelope while performing operational planning. The concept of envelope enclosure is formulated both deterministically and probabilistically, and its effectiveness is illustrated via several examples throughout the dissertation. Furthermore, the dissertation proposes dynamical operational planning, which is expected to open new avenues in operational planning research and practice.ii Résumé La planification opérationnelle fait partie intégrante du maintien d'un régime opérationneĺ economique et fiable des réseauxélectriques. Traditionnellement, les réseaux ontété conçus sans avoirà se soucier des phénomènes de rampes de puissance, de telle sorte que la planification opérationnelle devait uniquement traiter l'adéquation des capacités en partant du principe que les capacités de rampe deséquipements du réseauétaient suffisantes. De nos jours, l'intégration des sources d'énergie renouvelables a contribuéà augmenter la variabilité et l'incertitude dans l'équilibre de puissance entre la production et la charge. Cela nécessite d'évaluer p...

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“…A number of power system flexibility researchers have investigated how to define power system flexibility and flexibility metrics [3][4][5][6], how to evaluate it [7][8][9][10][11][12][13][14] and which resources can provide flexibility [15,16]. Basically, the flexibility resources focus on demand side resources [17][18][19], energy storage [20][21][22][23], advanced energy conversion technologies [24,25], and so on.…”

mentioning

confidence: 99%

Economic Decision-Making for Coal Power Flexibility Retrofitting and Compensation in China

Yuan

Zhu

et al. 2018

Sustainability

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Abstract:In China, in order to integrate more renewable energy into the power grid, coal power flexibility retrofitting is imperative. This paper elaborates a generic method for estimating the flexibility potential from the rapid ramp rate and peak shaving operation using nonlinear programming, and defines three flexibility elastic coefficients to quantify the retrofitted targets. The optimized range of the retrofitted targets determined by the flexibility elastic coefficients have a reference significance on coal power flexibility retrofitting. Then, in order to enable economic decisions for coal power flexibility retrofitting, we address a profit maximizing issue regarding optimization decisions for coal power flexibility retrofitting under an assumption of perfect competition, further analyzing the characteristic roots of marginal cost equal to marginal revenue. The rationality of current compensation standards for peak shaving in China can also be judged in the analysis. The case study results show that economic decision-making depends on the compensation standard and the peak shaving depth and time. At a certain peak shaving depth and time, with rational compensation standard power plants are willing to carry out coal power flexibility retrofitting. The current compensation standard in Northeast China is high enough to carry out coal power flexibility retrofitting. These research conclusions have theoretical significance for China's peak shaving compensation standards formulation.

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Power system flexibility assessment — State of the art

Cited by 33 publications

References 6 publications

A Unified Framework for Defining and Measuring Flexibility in Power System

A Unified Framework for Defining and Measuring Flexibility in Power System

Flexibility Envelopes for Power System Operational Planning

Economic Decision-Making for Coal Power Flexibility Retrofitting and Compensation in China

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