Application of power system stabilizers and static VAr compensators on a longitudinal power system
TL;DR: In this article, a longitudinal power system using a power system stabilizer (PSS) and a static VAr (reactive volt-ampere) compensator (SVC) is reported.
Abstract: The dynamic stability improvement of a longitudinal power system using a power system stabilizer (PSS) and a static VAr (reactive volt-ampere) compensator (SVC) is reported. An analytical approach is developed for the determination of PSS parameters. The effect of static VAr compensators installed at several different locations along 345 kV trunk lines on system responses is examined. Results from time-domain simulations indicate that the PSS and the SVC are very effective in damping system oscillations. >
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TL;DR: In this article, the impact of load models on an unstable low frequency oscillation damping, which recently occurred in the Taiwan power system, was also investigated, using the eigenvalue analysis approach.
Abstract: This paper uses the eigenvalue analysis approach to observe the impact of load models on an unstable low frequency oscillation damping, which recently occurred in the Taiwan power system. In order to enhance oscillation damping, the effect of load models on power system stabilizers is also investigated. Three kinds of the derived load models (a dynamic model, a composite model, and an exponential model) based on the component approach with the measured characteristics of power system loads are used in this paper. Time simulation results are extensively used to verify the eigenvalue analysis results with and without power system stabilizers. One set of field test data obtained from the Taiwan power nuclear plant with power system stabilizers is used to determine which load model provides a more accurate result in enhancement of oscillation damping. Depending on the results, the effect of load models on electromechanical oscillation damping with and without power system stabilizers is verified.
90 citations
Cites background from "Application of power system stabili..."
...N THE past twenty years, the phenomena and causes of low-frequency oscillation in the Taiwan power system have been studied extensively [1], [ 2 ]....
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TL;DR: It is found that the proposed neural net requires much less training time than the multilayer feedforward network with back-propagation-momentum learning algorithm and correct stability assessment can be achieved by the neural network.
Abstract: In the developed artificial neural network, those system variables which play an important role in steady-state stability, such as generator outputs and power system stabilizer parameters, are used as the inputs. The output of the neural net provides the information on steady-state stability. Once the connection weights of the neural network have been learned using a set of training data derived offline, the neural net can be applied to analyze the steady-state stability of the system in real-time situations where the operating conditions change with time. To demonstrate the effectiveness of the proposed neural net, steady-state stability analysis is performed on a synchronous generator connected to a large power system. It is found that the proposed neural net requires much less training time than the multilayer feedforward network with back-propagation-momentum learning algorithm. It is also concluded from test results that correct stability assessment can be achieved by the neural network. >
35 citations
TL;DR: In this article, a new controller, namely the combined reactive power and frequency (CRPF) auxiliary controller, has been developed and incorporated in the static var control system located at the middle of the transmission line.
10 citations
01 Jan 2012
TL;DR: In this paper, an attempt has been made to propose a new technique for selection of optimu m site of a power system stabilizer (PSS) to mitigate the small-signal stability problem in a multiprocessor power system.
Abstract: In this paper an attempt has been made to propose a new technique for selection of optimu m site of a power system stabilizer (PSS) to mitigate the small-signal stability problem in a mu ltimach ine power system. Study reveals that the PSS displaces the swing mode fro m its crit ical position to a more desirable position changing the response of the excitation system. Based on the change of the exciter transfer function with respect to the PSS transfer function, an Opt imu m PSS Location Index (OPLI) has been introduced and used to identify the best location of the PSS in a mu lt imachine system. The analysis of the effect of load on eigenvalues confirms that the prediction of best location of PSS by OPLI method is more effective in enhancing the small-signal stability of the system.
8 citations
DOI•
28 Feb 2010
TL;DR: In this article, an attempt has been made to propose a new technique for selection of optimum site of a power system stabilizer (PSS) to mitigate the small-signal stability problem in a multimachine power system.
Abstract: In this paper an attempt has been made to propose a new technique for selection of optimum site of a power system stabilizer (PSS) to mitigate the small-signal stability problem in a multimachine power system. Study reveals that the PSS displaces the swing mode from its critical position to a more desirable position changing the response of the excitation system. Based on the change of the exciter transfer function with respect to the PSS transfer function, an optimum PSS location index (OPLI) has been introduced and used to identify the best location of the PSS in a multimachine system. The analysis of the effect of load on eigenvalues confirms that the prediction of best location of PSS by OPLI method is more effective in enhancing the small-signal stability of the system.
Key words: Critical swing mode, optimum PSS location index, sensitivity of PSS effect, small signal stability.
8 citations
Cites methods from "Application of power system stabili..."
...The enhancement of damping of electromechanical oscillations in multimachine power systems by the application of a Power System Stabilizer (PSS) has been a subject of great attention in the past three decades (Larsen et al., 1981; Abe et al., 1983; Hsu et al., 1988; Kundur et al., 1989; Klein et al., 1992; Zhou et al., 1992; Ao et al., 1994; Rogers, 2000)....
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References
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TL;DR: In this article, the authors examined the various factors affecting the damping characteristics of low frequency oscillations which caused dynamic instability problem in the operation of Taiwan power system and showed that power system stabilizers can be employed as an effective means for improving dynamic stability.
Abstract: Sustained low frequency oscillations have been observed in Taiwan power system which is of longitudinal structure. It is the purpose of this paper to examine the various factors affecting the damping characteristics of these oscillations which caused dynamic instability problem in the operation of Taiwan power system. It is observed that the amount of power flow on the EHV transmission line and the characteristics of load have a significant effect on the damping of the system while the speed-governing system and the gain of automatic voltage regulator have only a minor one. Detailed investigation using both the frequency domain and time domain approaches also reveals that power system stabilizers can be employed as an effective means for improving dynamic stability of Taiwan power system.
98 citations
TL;DR: In this article, the operating and performance characteristics of two basic types of static, thyristor-controlled shunt compensators, one with a fixed capacitor bank and the other with synchronously switchable capacitor banks, are presented with regard to power transmission system applications.
Abstract: The operating and performance characteristics of two basic types of static, thyristor-controlled shunt compensators, one with a fixed capacitor bank and the other with synchronously switchable capacitor banks, are presented with regard to power transmission system applications. The operating principles, and the similarities and differences between the performance of the two schemes are discussed in the areas of steady-state voltage versus VAR characteristic, behavior under small and large system disturbances, harmonic generation, and loss versus output VAR characteristic.
96 citations
TL;DR: In this paper, the application of static reactive compensators (SVCs) to power transmission systems is discussed, and it is shown that SVCs can provide significant benefits in terms of increased transient stabilty and improved damping for synchronizing power flow oscillations.
Abstract: This paper concerns the application of static reactive compensators (SVCs) to Power transmission systems. Emphasis is placed on stability, and it is shown that SVCs can provide significant benefits in terms of increased transient stabilty liisand improved damping for synchronizing power flow oscillations. The paper includes descriptions Of static VAR compensators, with technical and economic comparisons of different compensators. An SVC system study model is presented which includes provision for modulating reactive compensation in response to a variety of system functions. Study procedures are illustrated which relate sYstem stability objectives to general specifications of SVCs, indluding their locations, regulating slopes, peak reactive power requirements, and modulation control.
87 citations
TL;DR: In this article, a Static Var System (SVS) was used to provide automatic, continuous voltage control on a 115 kV network in western Nebraska. But, the SVS was not designed for continuous voltage regulation.
Abstract: Basin Electric Power Cooperative will commission a Static Var System (SVS) in late 1977 to provide automatic, continuous voltage control on a 115 kV network in western Nebraska. This paper describes engineering studies which were conducted to select the SVS rating and site, determine harmonic filtering requirements, synthesize the SVS voltage regulator characteristics and to simulate the steady-state and dynamic performance of the SVS. The studies have shown that the SVS will perform as intended to regulate the steady-state voltage within ±0.5% and reduce post-fault voltage swings which otherwise might cause important motor loads to trip off line.
55 citations