Discrete-Event Systems Supervisory Control for a Dynamic Flow Controller

Afzalian, Ali A.; Niaki, S.A. Nabavi; Iravani, M.R.; Wonham, W. M.

doi:10.1109/tpwrd.2008.921114

Cited by 28 publications

(25 citation statements)

References 9 publications

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“…6, a positive sequence of 1.0 pu are specified in the sending end for the fundamental signal within the first 4 s as the previous state for normal conditions. In the time interval [4,7] s, a step of −0.05 pu is applied to the magnitude of the positive-sequence voltage, and in the interval [5,6] s, a further step of 0.08 pu of fifth harmonic with negative sequence is added to the 0.95 pu voltage, representing harmonic unbalanced voltage. Fig.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Despite various ways to improve the HFC configuration, in the proposed method the initial firing angle of the TCSC is set to 90°(when thyristors of TCSC are not fired) to benefit current designed controllers for the HFC [7,8] (the reader is referred to [8] for a more detailed discussion of switching strategies for the HFC). In this method, the conventional HFC provides the transmitted power to a lower band of ΔP, and by controlling the TCSC in the capacitive mode (i.e.…”

Section: Closed-loop Controller For Ihfcmentioning

confidence: 99%

“…In other words, using this method, TCSC (TSSC) plays a vital role in controlling the transmitted power when it is near to (far from) desired power. Therefore the previous closed-loop controllers [7,8] can be designed for the conventional HFC and simple controllers such as proportional-integralderivative (PID) ones are applicable to control the firing angle of the TCSC.…”

Section: Closed-loop Controller For Ihfcmentioning

confidence: 99%

“…A multi-objective optimisation methodology to find its optimal location has been presented in [6]. Based on discrete event systems [7] and an improved strategy [8], some controllers have been designed to control the HFC. Although the difference between operating points is reduced relative to the PST alone, the results verify that accurate control of the demanded power cannot be achieved.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Closed‐loop control system for an improved hybrid flow controller and its comparison with some hybrid devices

Soreshjani

Kargar

Niaki³

2015

IET Generation, Transmission & Distribution

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An improved configuration of the hybrid flow controller (HFC) is introduced to continuously adjust the power flow. In this configuration, a thyristor-controlled series capacitance (TCSC) is added to the conventional HFC to provide continuous variation in the HFC reactance. Moreover, simple closed-loop control methods are designed by considering all the practical constraints of TCSC for this improved HFC (IHFC) and another hybrid arrangement, which is called hybrid power flow controller. Furthermore, to compare and highlight features of the IHFC, simulation results of the designed controllers are carried out in different operating conditions and disturbances. This study also provides a quantitative comparison of various hybrid flexible AC transmission system devices.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Closed-loop Controller For Ihfcmentioning

confidence: 99%

Section: Closed-loop Controller For Ihfcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Closed‐loop control system for an improved hybrid flow controller and its comparison with some hybrid devices

Soreshjani

Kargar

Niaki³

2015

IET Generation, Transmission & Distribution

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“…A single-line diagram of the test system is shown in Figure 1, where the transmission line is represented by a lumped inductive reactance, X 10−11 , in accordance with the approach for the power flow model of the HFC [20]. With respect to buses i and j (Figure 1), the power network is represented by the corresponding Thevenin equivalents, V S , jX 1 and V r , jX 2 , respectively [21].…”

Section: Transmitted Power Control Using a Tcscmentioning

confidence: 99%

A comparison of fuzzy logic and PID controllers to control transmitted power using a TCSC

Soreshjani¹,

Abjadi²,

Kargar³

et al. 2014

Turk J Elec Eng & Comp Sci

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Nowadays, the use of flexible AC transmission systems (FACTS) is an economical and interesting approach to improve power transfer capability. The thyristor-controlled series capacitor, as a member of the FACTS family, can control interrelated parameters with dynamism due to its ability of rapid control and stabilization. Regardless of all of the works in this area, the control of transmitted power through the design of the firing angle controller is still missing. In this paper, first, the open-loop firing angle controller and its sensitivities are analyzed to fill in this gap. Next, closed-loop controllers such as PID and fuzzy controllers are designed and simulated in MATLAB/Simulink software. Simulation results show that the fuzzy logic controller has a better response, although it is designed with minimum, simple, triangle membership functions and reduced rule bases.

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Decentralized DES Supervisory Control for Coordination of ULTC and SVC

Noorbakhsh¹,

Afzalian²

2011

Asian Journal of Control

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This paper discusses the issues involved in modeling and synthesizing a discrete-event supervisory control system in a decentralized structure to coordinate the behavior of an under-load tap-changing transformer (ULTC) and a static VAR compensator (SVC) in electrical power systems. The control specifications are modeled as some automata, and it is shown that they are controllable. The designed closed-loop control system is non-blocking. The consistency of the high-level model in a two-level hierarchical control system is investigated. The proposed supervisory control is tested by inspecting its behavior in a simulated situation.

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Discrete-Event Systems Supervisory Control for a Dynamic Flow Controller

Cited by 28 publications

References 9 publications

Closed‐loop control system for an improved hybrid flow controller and its comparison with some hybrid devices

Closed‐loop control system for an improved hybrid flow controller and its comparison with some hybrid devices

A comparison of fuzzy logic and PID controllers to control transmitted power using a TCSC

Decentralized DES Supervisory Control for Coordination of ULTC and SVC

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