Adaptive nonlinear excitation control with L2 disturbance attenuation for power systems

Shen, Tielong; Mei, Shengwei; Lu, Qiang; Hu, Wei; Tamura, Katsutoshi

doi:10.1016/s0005-1098(02)00175-9

Cited by 93 publications

(83 citation statements)

References 17 publications

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“…[17] respectively. From these figures, the SAEC globally stabilizes the system (1-2) and provides better performance than the controller given in [17], which does not consider the influence of input saturation. The simulation results verify the proposed theoretical results i.e.…”

Section: Simulation Resultsmentioning

confidence: 98%

“…In this section, the developed control strategy for a SMIB power system is shown to be effective by a comparative simulation study of the SAEC and the excitation controller which is designed by using the approach proposed in [17]. [17] respectively.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Thus, on the basis of the classical SMIB model [17,18] and the above statements, the system dynamic model considered in this paper is proposed as follows: model [13,14], the SMIB model does not directly reflect the influences of power network components and loads, instead of aggregated node containing the information of these elements. Furthermore, the reduced-order model also neglects the flux linkages dynamics by using the singular perturbation technique.…”

Section: Problem Statement and System Modelmentioning

confidence: 99%

“…As such, a nonlinear robust excitation control scheme considering excitation input constraint is proposed in this paper. Thus, on the basis of the classical SMIB model [17,18] and the above statements, the system dynamic model considered in this paper is given as follows:…”

Section: Preliminaries and Controller Designmentioning

confidence: 99%

“…Based on the ve of robust control, in citation control system, the model errors should actuator saturation is uint. Simultaneously enthe control laws remainthis case, it is a critical dback control of power , a nonlinear robust excitation input constraint MIB model [17,18] and ic model considered in…”

Section: Proof Based On the Schur Complementsmentioning

confidence: 99%

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Nonlinear robust control for single-machine infinite-bus power systems with input saturation

Wan

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. In this paper, a new control scheme is proposed to achieve stability for a single-machine infinite-bus power system. A power system model simultaneously considering input saturation and time-varying uncertainties is presented. A sufficient condition for the system convergence is given and based on this result, a switching excitation control law with auxiliary system is designed. The stability analysis and simulation results all show that the developed controller is effective.Key words: nonlinear robust control, input saturation, generator excitation, single-machine infinite-bus power systems (SMIB).Nonlinear robust control for single-machine infinite-bus power systems with input saturation Y. WAN * College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China tion to the control problem of nonlinear systems with input saturation. In [9], an auxiliary system is employed to address input constraints, but only boundedness of the "last modified virtual error" is obtained. If the desired value of control input greatly exceeds the constraints, then the auxiliary system will be unstable and thus the convergence of the "last virtual error" to the origin cannot be ensured. In [10], the tanh function and the mean-value theorem are used to deal with the saturation function, and then the redial basis function i.e. neural network is employed to approximate the unknown control gain. However, since the tanh function is also a kind of bounded function, when there are large disturbances and the desired value of control input goes beyond the range of tanh, the efficacy of the designed control law may be limited. In [11], dynamic surface control is used to equivalently transform a class of nonlinear system into a linear system, and then the region of attraction which is enlarged to allow some degree of input saturation is estimated via a linear matrix inequality method [12]. But this approach does not give a solution for a case when the initial condition is out of this region of attraction. This article proposes a new nonlinear robust control framework to tackle the stabilization problem for a class of nonlinear system with time-varying uncertainties and input saturation. Compared with the prior works, the proposed method ensures not only the boundedness of state variables but the global stability of the closed-loop system. Furthermore, the approach proposed processes the saturation phenomenon directly and does not require approximating the saturation function by a smooth function, which is often not invertible outside its range.The paper is organized as follows: the preliminaries and a SMIB power system model are described in Section 2. In Section 3, a sufficient condition for the convergence of states to the origin under saturation is shown in a Theorem, and then on the basis of this result, a switching excitation control law with auxiliary system (SAEC) is designed, as well as stability analysis for the closed-loop system with the designed controller. The simulation resul...

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Section: Simulation Resultsmentioning

confidence: 98%

Section: Simulation Resultsmentioning

confidence: 99%

Section: Problem Statement and System Modelmentioning

confidence: 99%

Section: Preliminaries and Controller Designmentioning

confidence: 99%

Section: Proof Based On the Schur Complementsmentioning

confidence: 99%

See 3 more Smart Citations

Nonlinear robust control for single-machine infinite-bus power systems with input saturation

Wan

2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Design of a robust nonlinear controller for a synchronous generator connected to an infinite bus

2015

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This article presents a new design of robust finite-time controller which replaces the traditional automatic voltage regulator for excitation control of the third-order model synchronous generator connected to an infinite bus. The effects of system uncertainties and external noises are fully taken into account. Then a single input robust controller is proposed to regulate the system states to reach the origin in a given finite time. The designed robust finite-time excitation controller can refine the system behaviors in convergence and robustness against model uncertainties and external disturbances. The robustness and finite-time stability of the closed-loop system are analytically proved using the finite-time control idea and Lyapunov stability theorem. The suitability and robustness of the designed controller are shown in contrast with two other strong nonlinear control strategies. The main advantages of the proposed controller are as follows: a) robustness against system uncertainties and external noises; b) convergence to the equilibrium point in a given finite time; and c) the use of a single control input. V C 2015 Wiley Periodicals, Inc. Complexity 21: 203-213, 2016

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Dynamic COI‐tracking concept for the control of generators in multi‐machine power systems

Zhou

Gan

Shi

et al. 2007

Int Trans Elec Energy Syst

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SUMMARYIn the conventional excitation control concept, the power angle and frequency of a generator are driven to a pre-designed operation point after the fault occurs. It is named as Constant Point Stabilization (CPS) concept in this paper. A novel concept, called dynamic Center of Inertia (COI)-tracking concept is proposed in this paper. In the concept, the power angle and frequency of each generator track the dynamic COI of the power system. Compared to CPS concept, a salient feature the suggested dynamic COI-tracking concept has is that the generators are not restricted to constant angle point or frequency any longer but track the dynamic COI trajectory of the system to keep synchronous in rotor angle and frequency. Wide area measurement system (WAMS) will be used to transform COI signals to each generator. The time delay within a certain limit of WAMS signals is permitted. To make comparison between the two concepts, the control system models based on the two concepts are first established. Then, using the back-stepping method, two robust controllers are designed to achieve the control objectives of the two concepts. At last, dynamic simulations are carried out based on a 2-area-4-machine test power system, and the control effects of the two controllers, together with that of the conventional AVR þ PSS excitation system, are compared.

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Adaptive nonlinear excitation control with L2 disturbance attenuation for power systems

Cited by 93 publications

References 17 publications

Nonlinear robust control for single-machine infinite-bus power systems with input saturation

Nonlinear robust control for single-machine infinite-bus power systems with input saturation

Design of a robust nonlinear controller for a synchronous generator connected to an infinite bus

Dynamic COI‐tracking concept for the control of generators in multi‐machine power systems

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