Optimal observer design for load-frequency control

Yamashita, K.; Taniguchi, Tsuneo

doi:10.1016/0142-0615(86)90003-7

Cited by 70 publications

(26 citation statements)

References 4 publications

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“…Following the evolution of modern control concept and its application in interconnected power systems, classical control concepts were discarded in comparison to optimal control concept [8][9][10][11][12]. The optimal control theory applications for proposing optimal AGC regulator designs have a long list of publications over about four decades considering many aspects of power system structural and operational changes [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. The optimal AGC regulator designs are based on linear regulator theory which requires the feedback of either all the states variables of the system or state reconstruction.…”

Section: Introductionmentioning

confidence: 99%

Sub-optimal automatic generation control of interconnected power system using constrained feedback control strategy

Hasan

Ibraheem

Kumar

et al. 2012

International Journal of Electrical Power & Energy Systems

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Section: Introductionmentioning

confidence: 99%

Sub-optimal automatic generation control of interconnected power system using constrained feedback control strategy

Hasan

Ibraheem

Kumar

et al. 2012

International Journal of Electrical Power & Energy Systems

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“…However, these approaches given in [29]- [32] can not be applied for the interconnected power system with time delayed and parametric uncertainties.…”

Section: Steam Input To Turbo-generators or Water Inputmentioning

confidence: 99%

Observer Output Feedback Load Frequency Control for a Two-Area Interconnected Power System

Khang

Minh

et al. 2018

J. ADV. ENG. COMPUT.

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Abstract. This paper presents an observer output-feedback load frequency control for power systems with uncertain parameters and time delays in communication networks. First, an observer-based controller is designed dependent on only the observer output. Therefore, the conservatism is reduced and the robustness is enhanced. It also both save computing time and make the control method simpler. Second, the stability of both the observer error system and closed-loop control system is proven via the Lyapunov direct method. Moreover, simulation results show that the proposed observer output-feedback load frequency controller results in shortening the frequency's transient response, maintaining required control quality in the wider operating range, and being more robust to uncertainties as compared to some existing control methods.KeyWords: load frequency control, interconnected power systems, observer output.

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“…Since identification procedure presented in [41] can only be used for CAs that have only one power plant engaged in LFC, it AUTOMATIKA 51(2010) 1, [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] can not be used here because LFC in CA1 from Fig. 2 is conducted using three HPPs.…”

Section: Substitute Linear Power System Modelmentioning

confidence: 99%

“…Models for LFC algorithms testing purposes are generally linear and they have all power plants engaged in LFC within a CA replaced with just one substitute power plant [2][3][4][5]. That power plant can be of thermal type [6][7][8][9] or hydro type [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Applying Optimal Sliding Mode Based Load-Frequency Control in Power Systems with Controllable Hydro Power Plants

Vrdoljak¹,

Perić

Petrović

2010

Automatika

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In this paper an optimal load-frequency controller for a nonlinear power system is proposed. The mathematical model of the power system consists of one area with several power plants, a few concentrated loads and a transmission network, along with simplified models of the neighbouring areas. Firstly, a substitute linear model is derived, with its parameters being identified from the responses of the nonlinear model. That model is used for load-frequency control (LFC) algorithm synthesis, which is based on discrete-time sliding mode control. Due to a non-minimum phase behaviour of hydro power plants, full-state feedback sliding mode controller must be used. Therefore, an estimation method based on fast output sampling is proposed for estimating the unmeasured system states and disturbances. Finally, the controller parameters are optimized using a genetic algorithm. Simulation results show that the proposed control algorithm with the proposed estimation technique can be used for LFC in a nonlinear power system. Key words: Fast output sampling, Genetic algorithm, Identification, Load-frequency control, Power system model, Sliding mode control Primjena optimalnog kliznog režima upravljanja u sekundarnoj regulaciji frekvencije i djelatne snage razmjene regulacijskim hidroelektranama. U radu se predlaže optimalna regulacija frekvencije i djelatne snage razmjene za nelinearni elektroenergetski sustav. Unutar matematičkog modela sustava jedno se regulacijsko područje sastoji od nekoliko elektrana, manjeg broja koncentriranih trošila i prijenosne mreže. Ostala su regulacijska područja u modelu modelirana pojednostavljeno, nadomjesnim linearnim modelom sustavačiji su parametri dobiveni identifikacijom iz odziva nelinearnog sustava. Taj je linearni model zatim primijenjen u sintezi algoritma sekundarne regulacije koji je zasnovan na kliznom režimu upravljanja. Zbog neminimalno-faznog vladanja hidroelektrana primijenjena je struktura regulatora zasnovana na svim varijablama stanja sustava. Estimacija nemjerljivih stanja i poremećaja zasnovana je na metodi brzog uzorkovanja izlaznih signala sustava. Optimizacija parametara regulatora provedena je korištenjem genetičkog algoritma. Simulacijski rezultati pokazuju kako je predloženi upravljački algoritam, uz predloženu metodu estimacije, moguće koristiti za sekundarnu regulaciju frekvencije i djelatne snage razmjene u nelinearnom elektroenergetskom sustavu.Ključne riječi: brzo uzorkovanje izlaznog signala, genetički algoritam, identifikacija, sekundarna regulacija frekvencije i djelatne snage razmjene, model elektroenergetskog sustava, klizni režim upravljanja

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Optimal observer design for load-frequency control

Cited by 70 publications

References 4 publications

Sub-optimal automatic generation control of interconnected power system using constrained feedback control strategy

Sub-optimal automatic generation control of interconnected power system using constrained feedback control strategy

Observer Output Feedback Load Frequency Control for a Two-Area Interconnected Power System

Applying Optimal Sliding Mode Based Load-Frequency Control in Power Systems with Controllable Hydro Power Plants

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