Computing Safety Margins of Generation Rejection Scheme: A Framework for Online Implementation

Min, Daham; Kim, Seog-Joo; Seo, Seungwan; Moon, Young-Hwan; Sun, Kai; Chow, Joe H.; Hur, Kyeong

doi:10.1109/tsg.2016.2635687

Cited by 10 publications

(15 citation statements)

References 26 publications

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“…In this paper, after the occurrence of a From Figure 6, the contingency scenario along with the time domain are summarized as: a fault occurred in the 765 kV line at 2.0 s; after five cycles, the shunt reactor was disconnected and the fault was cleared; five of the eight generators were tripped at 2.15 s, respectively. The generator and transmission lines played a significant role in the power system, based on the large respective generation and transmission capacity in the steady-state condition before the disturbance occurred [45]. Therefore, their contingencies led to an active power insufficiency accompanied by a reactive power insufficiency.…”

Section: Resultsmentioning

confidence: 99%

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

Lee

Song

2018

Electronics

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This study develops an analytical method for assessing the voltage stability margins of a decentralized load shedding scheme; it then examines the challenges related to the existing load shedding scheme. It also presents a practical application for implementing the proposed method, based on the synchrophasor measurement technology in modern power grid operations. By applying the concept of a continuously-computed voltage stability margin index to the configuration of the Thévenin equivalent system, the maximum transfer power could be used as an index to monitor the voltage instability phenomenon and thus determine the required load shedding amount. Thus, the calculated voltage stability margin might be a useful index for system operators in the critical decision-making process of load shedding. Dynamic simulations are performed on real Korean power systems as case studies. Simulation results, when comparing the existing and proposed methods, showed that there was a considerable reduction in the amount of load shedding in the voltage instability scenario. This indicates that the synchrophasor measurement technology has a considerable effect on the proposed load shedding method. The simulation results have validated the performance of the proposed method.

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Section: Resultsmentioning

confidence: 99%

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

Lee

Song

2018

Electronics

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“…79 On the other hand, a generator rejection scheme (GRS) is a control action performed in an emergency by tripping one or more accelerated generators from a group of generators to prevent loss of synchronism. 46 OOS is also an instability condition and basically an angular instability of the system. 80 Due to an extensive power system fault or opening of a tie-line between two systems, a synchronous generator may lose its synchronism.…”

Section: Sips Definition and Recent Developmentsmentioning

confidence: 99%

“…The proposed index measures the rotor angles and second derivatives of those rotor angles to implement controlled islanding. The proposed energy-based index is represented by E is and shown in Equation (46)…”

Section: Decision-tree Based Approachmentioning

confidence: 99%

Recent trends in integrity protection of power system: A literature review

Rajalwal

Ghosh

2020

Int Trans Electr Energ Syst

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Background: An increase in the load demand has been forcing the electrical components to work near their allowable limits. The transformation of the power system in terms of technology and geographical stretch has imposed the necessity of employing advanced protection schemes in the system. The system integrity protection scheme (SIPS) has evolved as an effective measure with the gradual sprawl of the conventional grid with local measurements to a smart grid with wide-area measurement system. Aims: SIPS is a rapidly growing field in the power system and thus the study of its performance analysis, implementation methods, and applications is necessary. This paper provides a comprehensive overview of SIPS technology. Materials & Methods: In this paper, SIPS definition and classification are briefly discussed. SIPS normalization schemes that include load shedding, controlled islanding, generation rejection, ou-of-step prediction, relay settings are elaborated. To implement these normalization schemes, various methods such as index-based, optimization-based, WAMS based, EAC based, and ML-based are discussed and compared. Finally, a comparative assessment is framed based on SIPS applied for different power system issues such as transient instability, voltage instability, overloading, line contingency, protection security, etc. Results: It is observed that most of the proposed SIPS are implemented for improving transient stability. The preferred solution for implementing the SIPS by the researchers is load shedding. It is also observed that there is a lack of implementation of SIPS with renewable energy systems.

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“…GRSs or generator tripping schemes are emergency control systems designed to initiate preplanned outage of one or more accelerated generating units of power plants as prompt corrective actions in order to prevent the rest of generating units from the loss of synchronism [4]. Also, some GRSs may be designed to restore the power balance of the network following a contingency.…”

Section: Generation Rejection Scheme Based-on a Combinational Rotor Amentioning

confidence: 99%

“…Both GRSs are used to decrease the risk of an unnecessary outage of generating units. In [4], an analytical approach for determining the safe margins of GRS was developed. To implement this method, a practical framework alongside PMU data and energy management system (EMS) was proposed.…”

Section: Generation Rejection Scheme Based-on a Combinational Rotor Amentioning

confidence: 99%

Generation Rejection Scheme Based-on a Combinational Rotor Angle Trajectory Prediction

2019

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This paper presents a response-based generating rejection scheme (GRS) based on an angular stability prediction logic to initiate the outage of accelerated generating units while saving the rest of generating units from the loss of synchronism. First trigonometric, polynomial, and hybrid models of rotor angle trajectory based on the reasonable assumptions are proofed. Then, by taking these models in the prediction step, through the maximum use of measured data based on defining the forecast horizon (FH) and data window with incremental length, the stability/instability of generating units is separately predicted. Next, the status of tripping signal based on a combinational logic of the output results of the angular stability prediction method is specified. In the developed logic, if at least two models of the three designated models yield the same response about the unit stability status, the trip signal is accordingly fired or blocked. The proposed method is examined on the one machine infinite bus and the WSCC standard test bed under different operation and fault scenarios. The obtained results demonstrate that beside simplicity, low computational burden, and very short processing time, the proposed combinatorial method outperforms the existing ones working with individual prediction models.

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Computing Safety Margins of Generation Rejection Scheme: A Framework for Online Implementation

Cited by 10 publications

References 26 publications

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

Decentralized Load Shedding Method Based on Voltage Stability Margin Index Using Synchrophasor Measurement Technology

Recent trends in integrity protection of power system: A literature review

Generation Rejection Scheme Based-on a Combinational Rotor Angle Trajectory Prediction

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