Energy-based Evaluation of Stability Improvement by SVC with New Second-kick Design

Hashimoto, Hiroyuki; Taoka, Hisao; Gibescu, M.; Liu, Cheng-Ching

doi:10.1541/ieejpes1990.122.1_103

Cited by 3 publications

(10 citation statements)

References 8 publications

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“…Since the power flow solution is different for every region of constant tap configuration, it is necessary to calculate a new EM for each of these regions with the tap configuration identical in the first and second kick. The algorithm below is a modified version of the EM computation algorithm we first employed for systems with a continuous model [11].…”

Section: Second-kick Energy Margin For Discontinuous Systemsmentioning

confidence: 99%

“…The IEEJ 60-Hz test system is a radial system with 27 buses, 35 branches, and ten machines [11]. The one-line diagram is shown in Fig.…”

Section: B Ieej 60-hz Multimachine With Multi-ultc Test Systemmentioning

confidence: 99%

“…Our previous work [11] has shown that the energy margin and UEP coordinates are dependent on the site, timing, and nature of the disturbance and, of course, on the initial power flow solution. We have proposed using the EM for making decisions about installing stability-enhancing devices such as SVCs and TCSCs.…”

Section: Introductionmentioning

confidence: 99%

“…The second-kick-based EM computation method described in our previous work [11] is extended to allow for dealing with systems equipped with ULTCs. This paper starts with an SMIB example, which serves to illustrate that, for such a simplified model, the ULTC acts-as intuitively expected-to improve the system stability as measured by the EM.…”

Section: Introductionmentioning

confidence: 99%

“…This paper starts with an SMIB example, which serves to illustrate that, for such a simplified model, the ULTC acts-as intuitively expected-to improve the system stability as measured by the EM. Results are then shown for a simple ten-bus voltage stability test system [12] and finally for a modified version of the standard IEEJ 60-Hz test system analyzed in [11], with select loads now fed through step-down ULTC transformers. In the scenario shown for the ten-bus system, contrary to expectations, EM decreases with the tap-changer action.…”

Section: Introductionmentioning

confidence: 99%

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Energy-based stability margin computation incorporating effects of ULTCs

Gibescu

Liu

Hashimoto

et al.

IEEE Power Engineering Society General Meeting, 2005

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Abstract-This paper introduces a new definition and computation method for the energy margin as a means to quantify the degree of stability of a dynamic power system model. The method is based on detailed device modeling that spans both transient and midterm time scales and includes effects of under-load tap-changer (ULTC) actions. The energy margin is defined as the minimum distance in potential energy space between the first-and second-kick trajectories, where the latter is chosen to be marginally stable. A generalized second-kick design is proposed. This consists of a combination of a load-step first kick and a three-phase fault second kick, applied at a time instant when the system is "closest" to the boundary of the stability region. The value of the energy margin is tracked through various tap-changer configurations. Thus, situations where ULTC actions are detrimental to stability can be uncovered, and "optimal" tap positions can be found. The concept is first illustrated on a single-machine infinite bus (SMIB); then, results are shown for a ten-bus voltage stability test system and for a modified version of the standard IEEJ 60-Hz test system, where some loads are fed through step-down ULTCs.Index Terms-Energy function, power systems dynamic stability, second-kick method, under-load tap changers (ULTCs).

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Section: Second-kick Energy Margin For Discontinuous Systemsmentioning

confidence: 99%

“…The IEEJ 60-Hz test system is a radial system with 27 buses, 35 branches, and ten machines [11]. The one-line diagram is shown in Fig.…”

Section: B Ieej 60-hz Multimachine With Multi-ultc Test Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy-based stability margin computation incorporating effects of ULTCs

Gibescu

Liu

Hashimoto

et al.

IEEE Power Engineering Society General Meeting, 2005

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Critical Generation Evaluation Using Hybrid Energy Function Method

Tanaka

Kawabe

2016

Electrical Engineering Japan

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It is well known that the transient energy function (TEF) method is useful for an efficient transient stability assessment as represented by the estimation of the critical clearing time (CCT). However, there still remains an issue for practical use: most of the TEF methods adopt the classical model of a synchronous machine in which the internally generated voltage is assumed to be constant. Moreover, critical generated output can be a more practical stability index instead of the CCT used in the conventional TEF methods. In this paper, a conventional hybrid TEF method is developed in order to estimate the transient stable critical generated power by using an improved hybrid simulation. The proposed method can handle the detailed model for a synchronous machine and can estimate the critical generated power with higher accuracy. Experimental results for a large network model are given in order to verify the practicability of the proposed method. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 196(4): 11-20, 2016; Published online in Wiley Online Library (wileyonlinelibrary.com).

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Coordinated Voltage Control With Online Energy Margin Constraints

Liu

2016

IEEE Trans. Power Syst.

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Based on data available from phase measurement units (PMUs), this paper proposes an energy margin constrained online coordinated voltage control (CVC) algorithm. First, the energy function model is established, which is based on detailed device models that include the effects of shunt capacitor banks, reactive power output of generators and under-load-tap-changers (ULTCs). In order to improve the computational efficiency, a Lie derivative-based method is used to map the energy change into the system trajectory along the energy manifold. Then, the change of energy margin based on the Lie derivative is used as the objective function and the reactive power margin is used as a constraint to formulate a linear programming problem. A coordinated strategy is proposed to help achieve the optimal solution when the linear programming problem is solved. In comparison with the other control modes, the proposed method improves the stability margin and the control effectiveness of voltage profile. Numerical results are provided for a three-machine system, the IEEE-30 bus system and the New England-39 bus benchmark system. Index Terms-Coordinated strategy (CS), coordinated voltage control (CVC), energy margin, voltage stability.Qun-Ying Liu (M'13) received the B.Eng. degree and M.S. and Ph.D. degrees in electrical engineering from

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Energy-based Evaluation of Stability Improvement by SVC with New Second-kick Design

Cited by 3 publications

References 8 publications

Energy-based stability margin computation incorporating effects of ULTCs

Energy-based stability margin computation incorporating effects of ULTCs

Critical Generation Evaluation Using Hybrid Energy Function Method

Coordinated Voltage Control With Online Energy Margin Constraints

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