Power system dynamics and stability

Machowski, J.

doi:10.1016/0140-6701(96)88716-9

Cited by 174 publications

(128 citation statements)

References 3 publications

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“…To isolate multiple faults, one can repeat the abovementioned procedure for each of the potential fault combinations. We can derive similar observers for all faults and then use (13) to isolate each of them. Next we show that one can construct UIOs also for classes of networked systems.…”

Section: Definition 2 (Uio)mentioning

confidence: 99%

“…In the case where there are buses that are not connected to synchronous machines and are described by algebraic equations; one has two alternatives. First, one can use equation (24) to model only the buses that are connected to synchronous machines and use the techniques in [13], Chapter 14, to remove the algebraic relations from the power network model and assume that the faults only affect the buses connected to synchronous machines. Second, one may assume that the buses that are not connected to the machines are governed by dynamic equations of type (24), albeit with small damping and inertia coefficients [11].…”

Section: Fdi In Power Networkmentioning

confidence: 99%

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Distributed fault detection for interconnected second-order systems

Shames¹,

Teixeira²,

Sandberg³

et al. 2011

Automatica

384

270

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In this paper the existence of unknown input observers for networks of interconnected second-order linear time invariant systems is studied. Two classes of distributed control systems of large practical relevance are considered. It is proved that for these systems one can construct a bank of unknown input observers, and use them to detect and isolate faults in the network. The result presents a distributed implementation. In particular, by exploiting the system structure, this work provides further insight into the design of UIO for networked systems. Moreover, the importance of certain network measurements is shown. Infeasibility results with respect to available measurements and faults are also provided, as well as methods to remove faulty agents from the network. Applications to power networks and robotic formations are presented. It is shown how the developed methodology apply to a power network described by the swing equation with a faulty bus. For a multi-robot system, it is illustrated how a faulty robot can be detected and removed.

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Section: Definition 2 (Uio)mentioning

confidence: 99%

Section: Fdi In Power Networkmentioning

confidence: 99%

Distributed fault detection for interconnected second-order systems

Shames¹,

Teixeira²,

Sandberg³

et al. 2011

Automatica

384

270

View full text Add to dashboard Cite

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“…Therefore, it is important to model and determine the DC component of current that needs to be considered in the system so that all types of failures can be covered in order to avoid causing of any damages to breakers, generator and network, as presented in [2,3,13].…”

Section: Synchronization With Phase Discrepancy Of the Generator Intomentioning

confidence: 99%

Fault current due to asynchronous connection of the generator to the grid and impact on HV circuit breaker with gas SF6

2017

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Original scientific paperThe description and analysis of phenomena that occur in case of disconnection of fault currents with generator circuit breakers after asynchronous connection of a generator and difficulties encountered during the process of disconnection are given in the paper. Generally, the biggest problems occur during the interruption of the fault when the direct current component (DC) is very high. DC component value depends on the type and conditions of the fault. For this purpose, a real study case with accidental asynchronous connection of generator via 400 kV circuit breaker is given from the Kosovo Power System which seriously damages the circuit breaker. For the purposes of this analysis, the real case situation has been also modelled with software such as: EMTP/ATP and PSS/E. It is important to emphasize that during using the high speed AC circuit breaker in power system it is not always the advantage to make successful disconnection of failures through High Voltage Circuit Breaker due to the presence of the high value DC component and the delay of passing of AC current through zero. For the generator the most important is detail analysis of behaviour of the generator in network in order to specify proper circuit breaker that can cover all circumstances that can happen in the system so to be able to protect the generator, step up transformer and other equipment. Keywords: AC component; asynchronous connection; DC component of fault current; high voltage generator circuit breaker; short circuit Struja kvara uslijed asinkronog priključka generatora na mrežu i njen utjecaj na visokonaponski prekidač s plinom SF6Izvovorni znanstveni članak U radu su dani opis i analiza fenomena koji se događaju u slučaju isključenja struje kvara generatorskim prekidačima nakon asinhronog priključenja generatora i poteškoćama tokom procesa isključenja. Općenito, najveći problemi se javljaju tokom prekida kvara kada je komponenta istosmjerne struje (DC) vrlo visoka. Vrijednost DC komponente ovisi o vrsti i uvjetima kvara. U cilju analize ovog fenomena, u radu je analizirana situacija slučajnog asinhronog priključenja generatora preko 400 kV prekidača u elektroenergetskom sustavu Kosova koja je dovela do oštećenja prekidača. Za potrebe analize, ovaj slučaj je modeliran u softverskim paketima EMTP/ATP i PSS/E. Važno je napomenuti da uporaba brzih AC prekidača u elektroenergetskom sustavu nije uvijek prednost za omogućavanje uspješnog isključenja kvara pomoću visokonaponskog prekidača, zbog prisustva DC komponente s visokim vrijednostima i zakašnjenja prolaza AC struje kroz nulu. Za generatore je najvažnija detaljna analiza ponašanja u mreži kako bi se odredile optimalne karakteristike prekidača u svim okolnostima koje se mogu dogoditi u sustavu, kako bi se omogućila pravilna zaštita generatora, step up transformatora i druge opreme.Kljućne rijeći: asinkrono priključenje; generatorski prekidač visokog napona; komponenta istosmjerne struje kvara (DC); komponenta izmjenične struje (AC); kratki spoj

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“…Various methods to reference identification of the series part, in order to improve the transient stability of the system based on: "optimal parameters"[2], "state variables" [3], and also "injection model" were studied. Finally, a new identification method based on "state variables" was proposed [4].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, an important question is the The UPFC parameters can be controlled in order to achieve the maximal desired effect in solving first swing stability problem. This problem appears for bulky power systems with long transmission lines.Various methods to reference identification of the series part, in order to improve the transient stability of the system based on: "optimal parameters"[2], "state variables" [3], and also "injection model" were studied. Finally, a new identification method based on "state variables" was proposed [4].…”

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confidence: 99%

Comparison of Simulation and Experimental Results of UPFC used for Power Quality Improvement

Muthukrishnan¹,

Kumar²

2010

IJCEE

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Abstract-This paper deals with digital simulation and implementation of power system using UPFC to improve the power quality. The UPFC is also capable of improving transient stability in a power system. It is the most complex power electronic system for controlling the power flow in an electrical power system. The real and reactive powers can be easily controlled in a power system with a UPFC. The circuit model is developed for UPFC using rectifier and inverter circuits. The control angle is varied to vary the real and reactive powers at the receiving end. The Matlab simulation results are presented to validate the model. The experimental results are compared with the simulation results. Index Terms-UPFC, Power Quality, Statcom, Compensation and matlab simulink I. INTRODUCTIONThe power-transfer capability of long transmission lines are usually limited by large signals ability. Economic factors, such as the high cost of long lines and revenue from the delivery of additional power, give strong incentives to explore all economically and technically feasible means of raising the stability limit. On the other hand, the development of effective ways to use transmission systems at their maximum thermal capability has caught much research attention in recent years. Fast progression in the field of power electronics has already started to influence the power industry. This is one direct outcome of the concept of flexible ac transmission systems (FACTS) aspects, which has become feasible due to the improvement realized in power-electronic devices. In principle, the FACTS devices could provide fast control of active and reactive power through a transmission line. The unified power-flow controller (UPFC) is a member of the FACTS family with very attractive features. This device can independently control many parameter, so it is the combination of the properties of a static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC) [1].These devices offer an alternative mean to mitigate power system oscillations. Thus, an important question is the The UPFC parameters can be controlled in order to achieve the maximal desired effect in solving first swing stability problem. This problem appears for bulky power systems with long transmission lines.Various methods to reference identification of the series part, in order to improve the transient stability of the system based on: "optimal parameters"[2], "state variables" [3], and also "injection model" were studied. Finally, a new identification method based on "state variables" was proposed [4]. This paper is organized as follows. After this introduction, the principle and operation and of a UPFC connected to a network are presented. In section II, the control strategy for UPFC is introduced. Simulation results are presented in sections III. Section IV describes the conclusion. II. UPFC SYSTEMA simplified scheme of a UPFC connected to an infinite bus via a transmission line is shown in Fig.1. UPFC consists of parallel and series branches, each one contain...

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Power system dynamics and stability

Cited by 174 publications

References 3 publications

Distributed fault detection for interconnected second-order systems

Distributed fault detection for interconnected second-order systems

Fault current due to asynchronous connection of the generator to the grid and impact on HV circuit breaker with gas SF6

Comparison of Simulation and Experimental Results of UPFC used for Power Quality Improvement

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