On-line transient stability assessment in operation-DEEAC in Northeast China Power System

Xue, Yusheng; Luo, Yang; Xue, Feng; Wang, Zhu; Yang, Ke; Jiang, Jiping

doi:10.1109/tencon.1993.320588

Cited by 12 publications

(4 citation statements)

References 8 publications

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“…If the restart is unsuccessful, the operation of LCC-HVDC exits, which means the LCC-HVDC dynamic equations (11) are zero. At the same time, the currents I xI , I xR , I yR , I yI at LCC-HVDC buses are set to zero in equation (15). After the TSEC formulation (1) is revised, the direct method based MASA is used to solve the problem.…”

Section: Application Of Tsec In Power System With DC Faultsmentioning

confidence: 99%

“…One of the research directions is the direct method. In order to avoid solving the DAEs, the direct methods, such as the potential energy boundary surface (PEBS) method [14], the extended equal area criteria (EEAC) method [15], the stability region‐based controlling unstable equilibrium point method (BCU) [16], and a control‐oriented energy function based on passivity method [17], are proposed to describe the transient stability constraints as transient margin. The TSEC strategies are obtained by sensitivity analysis of the transient energy margin.…”

Section: Introductionmentioning

confidence: 99%

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Transient stability emergency control for AC/DC grids considering successive commutation failures

Geng

Jiang

et al. 2021

IET Generation Trans & Dist

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The prevalence of Line‐Commutated Converter (LCC) HVDC makes the coupling and interaction phenomenon between AC system and DC system of particular complicated. There are significant challenges to determine control strategy using state‐of‐the‐art approaches especially when discrete events (e.g. switching and state resetting) happen frequently due to successive commutation failures (CFs). An enhanced transient stability emergency control (TSEC) for AC/DC grids based on the optimal control is presented to maintain the transient stability and mitigate the successive CFs caused by AC faults. In the proposed TSEC method, an extinction advance angle constraint is added to the TSEC model to mitigate the successive CFs. The emergency power control of LCC‐HVDC is employed as an additional control measure to reduce generator‐tripping and load‐shedding amount. The direct sequential approach is adopted to obtain the optimal solution of TSEC to improve the calculation efficiency. In the direct sequential approach, the modified adjoint sensitivity analysis (MASA) with the consideration of adjoint jump conditions is utilized to increase the gradient calculation accuracy. The effectiveness of the control strategies and the accuracy of the sensitivity calculation are verified on two test systems.

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Section: Application Of Tsec In Power System With DC Faultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient stability emergency control for AC/DC grids considering successive commutation failures

Geng

Jiang

et al. 2021

IET Generation Trans & Dist

View full text Add to dashboard Cite

show abstract

“…Since the disturbed trajectories obtained by numerical simulation could include any factor, [23] proposed an evaluation scheme to extract quantitative information from trajectories directly. Several quantitative evaluation indices including power angle stability [23], voltage stability [24], frequency stability [25] have been developed and applied into practical projects [26], [27]. Inspired by these work, the commutation security margin index (CS-MI) is proposed in this paper.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment for Commutation Security Based on Extinction Angle Trajectory

Xue

2021

Journal of Modern Power Systems and Clean Energy

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In order to reduce the risk of commutation failure (CF) in the AC/DC hybrid power system, the quantitative analysis on CF is required for on-line assessment and optimal control. This paper presents an accurate and reliable method to quantify the commutation security based on the trajectory due to the complexity of the high-voltage direct current (HVDC) model. Firstly, the characteristics of the extinction angle trajectory are analyzed under both commutation success and failure conditions. The commutation security margin index (CSMI) is then proposed for the HVDC systems. Moreover, a search strategy for parameter limits is put forward based on the sensitivity analysis of CSMI to accelerate the search speed with a guaranteed accuracy level. A modified IEEE 39-bus power system and an actual large-scale power system with 46 generators and 821 buses are utilized to verify the validity and robustness of the proposed index and strategy.

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“…The DEEAC approach updates the OMIB's parameters a few times during the transient of both the fault‐on and post‐fault period. It also uses an improved approach for identifying the critical cluster, which alleviates any experience‐based considerations [32, 33]. The IEEAC method incorporates the standard EEAC approach with the numerical integration techniques to form a coherent scheme for transient stability assessment [34].…”

Section: Introductionmentioning

confidence: 99%

Generator‐based threshold for transient stability assessment

et al. 2019

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Power systems are frequently subjected to variations of the operating conditions due to the occurrence of contingencies such as faults, load or generator tripping. These disturbances might enforce the system to enter the instability region and thus deteriorate its overall performance. This paper proposes a systematic approach for transient stability assessment using generator-based threshold. An individual stability limit is designed for each generator instead of using only one pre-defined threshold for all generators. The considered contingencies are characterized by a fault type, location, loading condition and critical clearing time to consider wide range of operating conditions. Two fault locations are only considered to reduce the search space for stability limits; the generator terminals and mid of transmission lines. The critical clearing time is used to find the maximum relative rotor angle (MRRA) of individual generators attained during the entire time domain simulation. The MRRA of each generator represents the maximum angle which can be reached without losing synchronism at a given contingency. Conservative stability limits are drawn around the minimum stable drift of each generator which is chosen from the set of MRRAs of all contingencies. The effectiveness of the proposed approach is tested using the modified New-England, 39bus system.

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On-line transient stability assessment in operation-DEEAC in Northeast China Power System

Cited by 12 publications

References 8 publications

Transient stability emergency control for AC/DC grids considering successive commutation failures

Transient stability emergency control for AC/DC grids considering successive commutation failures

Quantitative Assessment for Commutation Security Based on Extinction Angle Trajectory

Generator‐based threshold for transient stability assessment

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