Stability Analysis of Power Systems With Inclusion of Realistic-Modeling WAMS Delays

Liu, Muyang; Dassios, Ioannis; Tzounas, Georgios; Milano, Federico

doi:10.1109/tpwrs.2018.2865559

Cited by 85 publications

(44 citation statements)

References 30 publications

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“…The PD compensation achieves a relatively smaller amplitude error and, thus, a better fidelity, especially during the first swing. Figure 4 shows a time-varying WAMS delay model according to the wide-area communication process discussed in [19]. 4.…”

Section: Illustrative Examplementioning

confidence: 99%

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Model-Independent Derivative Control Delay Compensation Methods for Power Systems

Liu¹,

Dassios²,

Tzounas³

et al. 2020

Energies

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The paper examines the effectiveness of utilizing the derivatives of time delayed, wide-area signals in mitigating their destabilizing impact on power system dynamic response. In particular, the paper discusses two derivative control-based delay compensation methods, namely proportional-derivative (PD) and predictor-based delay compensation. The two methods are compared in terms of their open-loop signal fidelity and their impact on the closed-loop system stability. The paper also provides a technique to carry out small-signal stability analysis with inclusion of derivative control based compensation, which leads to a Neutral Time-Delay System (NTDS). In addition, we provide a new theorem on the stability of the NTDS. Finally, nonlinear time domain simulations and eigenvalue analysis based on the IEEE 14-bus and New England 39-bus systems were carried out for the sake of comparison of the two delay compensation methods.

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Section: Illustrative Examplementioning

confidence: 99%

“…The critical eigenvalues of Equation (13), however, need to be determined with an iterative technique [19]. The accuracy of the resulting critical eigenvalues heavily relies on the choice of the initial guess for λ.…”

Section: Wide-area Measurement Delay Modelmentioning

confidence: 99%

Model-Independent Derivative Control Delay Compensation Methods for Power Systems

Liu¹,

Dassios²,

Tzounas³

et al. 2020

Energies

Self Cite

View full text Add to dashboard Cite

show abstract

“…The timely and effective coherent groups identification (CGI) is critical for model reduction, wide-area control and controlled islanding of interconnected power system [2], [3]. Since the advancement of wide-area measurement system (WAMS) based on phasor measurement units (PMUs) has made it possible to obtain the real-time dynamic information of power systems [4]- [6], many online coherency identification approaches are developed for real-time power system stability analysis and control.…”

Section: Introductionmentioning

confidence: 99%

An WAMS-Based Online Generators Coherency Identification Approach for Controlled Islanding

et al. 2020

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In this paper, an online model-free approach based on the largest Lyapunov exponents (LLE) and angular velocity deviation is provided for coherent groups identification (CGI). Firstly, by using a model-free LLE calculation method, the generator coherency identification (GCI) criterions are proposed by establishing the mathematical relationship between the LLE and angular velocity difference. Secondly, an online CGI scheme for power systems is designed. Compared with the existing measurement-based methods, the breakthrough work of this paper is that the proposed GCI criterions combines the stability theory of nonlinear dynamic trajectory based on LLE with the physical mechanism of the out-of-step between generators, such that it can improve both the speed and the accuracy of the GCI. Besides, the proposed approach needs not to find the optimal observation window size and shorten the required observation window size greatly. Moreover, it can be applied to online CGI with small computation requirement. Extensive test results on New England 39-Bus System and practical East China (EC) power grid, as well as the comparisons with existing CGI methods verify high accuracy and efficiency of the proposed approach. INDEX TERMS Coherency identification, largest Lyapunov exponents (LLE), dynamic features, post-fault phase trajectory, wide-area measurement system (WAMS).

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“…The most important feature of this subject is that it expresses real systems better than integer order ones [2]. As it is known time delays are intrinsic of a variety of electrical, electronic, and communication systems, control applications, power systems with long transmission lines, and many real world applications [3][4][5]. In control applications, there are many examples of neutral-type time-delay systems as well as discrete-continuous hybrid systems regarded as delay differential algebraic equations (DDAEs) [4].…”

Section: Introductionmentioning

confidence: 99%

An algebraic stability test for fractional order time delay systems

Özyetkin

Băleanu

2020

Int. J. Optim. Control, Theor. Appl. (IJOCTA)

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In this study, an algebraic stability test procedure is presented for fractional order time delay systems. This method is based on the principle of eliminating time delay. The stability test of fractional order systems cannot be examined directly using classical methods such as Routh-Hurwitz, because such systems do not have analytical solutions. When a system contains the square roots of s, it is seen that there is a double value function of s. In this study, a stability test procedure is applied to systems including sqrt(s) and/or different fractional degrees such as s^alpha where 0 < α < 1, and α include in R. For this purpose, the integer order equivalents of fractional order terms are first used and then the stability test is applied to the system by eliminating time delay. Thanks to the proposed method, it is not necessary to use approximations instead of time delay term such as Pade. Thus, the stability test procedure does not require the solution of higher order equations.

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Stability Analysis of Power Systems With Inclusion of Realistic-Modeling WAMS Delays

Cited by 85 publications

References 30 publications

Model-Independent Derivative Control Delay Compensation Methods for Power Systems

Model-Independent Derivative Control Delay Compensation Methods for Power Systems

An WAMS-Based Online Generators Coherency Identification Approach for Controlled Islanding

An algebraic stability test for fractional order time delay systems

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