On the Use of Dynamic Thermal-Line Ratings for Improving Operational Tripping Schemes

Cong, Yuhang; Regulski, P.; Wall, Peter; Osborne, Mark; Terzija, Vladimir

doi:10.1109/tpwrd.2015.2502999

Cited by 54 publications

(25 citation statements)

References 6 publications

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“…The feasible region of the master problem is continuously shrunk by returned Benders cuts and the most economical operating point is searched again in the new feasible region. According to following generating approaches for Benders cuts, above constraints (29) and (30) are linear. Therefore, the master problem in each iteration is a linearly constrained quadratic optimization problem which can be directly solved by current optimizers such as Cplex, Gurobi and so on.…”

Section: Master Problem (Preventive Control Optimization)mentioning

confidence: 99%

“…A new power flow formulation considered the line electro-thermal coupling effect has been introduced in [26], and the error in power transfer evaluation decreased by about 20% by using this method. In [27][28][29], the thermal rating of transmission lines has been utilized to increase the threshold value of wind power integration and avoid the unnecessary tripping of pre-selected generation assets. Besides the static rating difference, transmission lines have the thermal inertia and corresponding time constants range between several mins and ten mins [30].…”

Section: Introductionmentioning

confidence: 99%

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Using the Thermal Inertia of Transmission Lines for Coping with Post-Contingency Overflows

2019

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For the corrective security-constrained optimal power flow (OPF) model, there exists a post-contingency stage due to the time delay of corrective measures. Line overflows in this stage may cause cascading failures. This paper proposes that the thermal inertia of transmission lines can be used to cope with post-contingency overflows. An enhanced security-constrained OPF model is established and line dynamic thermal behaviors are quantified. The post-contingency stage is divided into a response substage and a ramping substage and the highest temperatures are limited by thermal rating constraints. A solving strategy based on Benders decomposition is proposed to solve the established model. The original problem is decomposed into a master problem for preventive control and two subproblems for corrective control feasibility check and line thermal rating check. In each iteration, Benders cuts are generated for infeasible contingencies and returned into the master problem for adjusting the generation plan. Because the highest temperature function is implicit, an equivalent time method is presented to calculate its partial derivative in Benders cuts. The proposed model and approaches are validated on three test systems. Results show that the operation security is improved with a slight increase in total generation cost.

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Section: Master Problem (Preventive Control Optimization)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using the Thermal Inertia of Transmission Lines for Coping with Post-Contingency Overflows

2019

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“…Removing this asset immediately may initiate a cascade of thermal overloads. In contrast, by using wide area measurements to develop an accurate view of the system state and the evolving threat to security, a wide area protection scheme could identify the importance of the asset to system security and exploit short term thermal ratings (possibly complemented with dynamic thermal line ratings [24]) to delay the local protection action and provide more time to relieve the overload by alternative means and preserve system security. Thus, wide area protection can be used to realize protection actions that adapt to the system's needs, in terms of security, and protect against wide area disturbances and cascading failures.…”

Section: Cascade Failuresmentioning

confidence: 99%

Improving the performance of power system protection using wide area monitoring systems

Phadke

Wall

Ding

et al. 2016

J. Mod. Power Syst. Clean Energy

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Wide area monitoring (WAM) offers many opportunities to improve the performance of power system protection. This paper presents some of these opportunities and the motivation for their development. This methods include monitoring the suitability of relay characteristics, supervisory control of backup protection, more adaptive and intelligent system protection and the creation of novel system integrity protection scheme. The speed of response required for primary protection means that the role WAM in enhancing protection is limited to backup and system protection. The opportunities offered by WAM for enhancing protection are attractive because of the emerging challenges faced by the modern power system protection. The increasingly variable operating conditions of power systems are making it ever more difficult to select relay characteristics that will be a suitable compromise for all loading conditions and contingencies. The maloperation of relays has contributed to the inception and evolution of 70 % of blackouts, thus the supervision of the backup protection may prove a valuable tool for preventing or limiting the scale of blackouts. The increasing interconnection and complexity of modern power systems has made them more vulnerable to wide area disturbances and this has contributed to several recent blackouts. The proper management of these wide area disturbances is beyond the scope of most of the existing protection and new, adaptive system integrity protection schemes are needed to protect power system security.

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“…From a practical power system operation viewpoint, the adaptive transmission capacity is evaluated based on the lead-time for control actions for alleviating the transmission line overload [20]. Reference [21] proposed a method for incorporating DLR with real-time weather conditions into existing system integrity protection schemes. Reference [22] evaluated the effect of DLR under assumed contingencies (N-1 and N-2 criteria) in a power system with high wind power penetration.…”

Section: Introductionmentioning

confidence: 99%

“…In conventional power systems, the clearing of a transmission line fault is considered to result in a significant change in the line current within the short time involved (10-15 min). Consequently, in present power systems, the line protection schemes used for alleviating transmission line overloads focus on line fault clearing [21]. However, when the penetration of IRESs is high, the transmission line current fluctuates significantly and does not change in a step-like manner.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

2017

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Due the high penetration of intermittent renewable energy sources (IRESs), transmission line currents show large fluctuations and thus significant uncertainty. This makes it difficult to operate a power system without violating transmission capacity constraints. This paper evaluates the dynamic line ratings (DLRs) of overhead lines based on changes in the line current owing to the high penetration of intermittent renewable energy sources. In particular, by focusing on extremely large (but rare) forecasting errors in the intermittent renewable energy source output, which are generally inevitable in most forecasting methods, a model for representing the forecasting error in line with current variation due to intermittent renewable energy source output is developed. The model is based on a shape parameter that represents the equivalent current variation required for the same temperature increase as that due to the extremely large forecasting error. Finally, based on the annual minute-by-minute irradiance data, preventive control of the transmission network with dynamic line ratings is evaluated using worst-case parameter values.

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On the Use of Dynamic Thermal-Line Ratings for Improving Operational Tripping Schemes

Cited by 54 publications

References 6 publications

Using the Thermal Inertia of Transmission Lines for Coping with Post-Contingency Overflows

Using the Thermal Inertia of Transmission Lines for Coping with Post-Contingency Overflows

Improving the performance of power system protection using wide area monitoring systems

Evaluation Method for Real-Time Dynamic Line Ratings Based on Line Current Variation Model for Representing Forecast Error of Intermittent Renewable Generation

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