Comparison of transient performance of superconducting and conventional generators in a multimachine system

Osheba, S. M.; Alyan, M.A.A.S.; Rahim, Y.H.A.

doi:10.1049/ip-c.1988.0051

Cited by 12 publications

(19 citation statements)

References 11 publications

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“…The block diagram of the excitation system is shown in Fig. (2) [7]. Analysis of modern voltage regulators shows that under heavy load conditions the continuously acting of excitation systems introduces negative damping.…”

Section: Excitation Systemmentioning

confidence: 99%

High Side Voltage Controller to Improve Performance and Voltage Stability of a Power System

Khattab

Nasef

Morsy

2013

ERJ. Engineering Research Journal

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This paper describes a high side voltage controller (HSVC) design, implementation and performance study for a synchronous generating unit connected to an infinite bus power system via a transformer and a double-circuit transmission line. In addition to enhance the system performance, the HSVC can improve power system voltage stability by adding supplemental control to conventional generator excitation system. The simulation results using detailed nonlinear model for the system with: a conventional automatic voltage regulator (AVR), power system stabilizer (PSS), and applying HSVC, are obtained. These results illustrate the superiority of HSVC to enhance the system performance as well as its voltage stability when subjected to different disturbances.

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Section: Excitation Systemmentioning

confidence: 99%

High Side Voltage Controller to Improve Performance and Voltage Stability of a Power System

Khattab

Nasef

Morsy

2013

ERJ. Engineering Research Journal

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“…The transfer function of the pss is shown by broken line in Fig.(2). PSS is a lead-lag compensator with two time constants T,, and TS2 and a gain G, [4]. The parameters of the pss should be carefully selected for each machine.…”

Section: Excitation Systemmentioning

confidence: 99%

“…reactance and low inertia constants (2,31. The trend of these parameters in desip tends to reduce the stability margin and adversely affect system performance [4]. moreover, increasing the number of generating units increases the power system complexity that arise from the lugh dimensionality of the system, strong interaction anlong machines, practical constrains on transferring control signals over long distances between power stations [5].…”

Section: Introductionmentioning

confidence: 99%

“…30, No. 3, July 2007, PP 313-326 313 0 Faculty of Engineering, Minonfiya University, Egypt placed to synchronize SCGs in multi-machine environments [4]. The SCG has completely diierent construction criteria than conventional generators and characterized by its lower reactance which allow delivery of higher short-circuit ratios and longer critical fault-clearing times and hence increase system stability.…”

Section: Introductionmentioning

confidence: 99%

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Combined FLC and TCSR to en-Nce the Performance of Power Systems Including a Superconducting Generator

Morsy

Khattab

Osheba

et al. 2007

ERJ. Engineering Research Journal

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This paper presents the design and application of a combined fuzzy logic (FL) controller and a thyristor controlled static reactive power compensator (TCSR) to enhance the performance of a multi-machine power system. This is a 12-bus system which includes superconducting generator (SCG) and three conventional machines of different types and ratmgs. The FL controller is designed and implemented in the governor control loop of the SCG. While, conventional generators are equipped with different excitation systems and then conventional controllers. Also, the TCSR compensator is designed and included at different locations due to its increasing importance in suppressing power system oscillations ahd improving system damping. A fairly detailed Non-linear model of the whole system is built and computer simulations are used to demonstrate the effectiveness of the combined conml scheme in improving the static and dynamic performance of the power system under different disturbances and over a wide range of operating conditions. A com~arison is made between these results to select the most effective location of the TCSR. The m l t ' s are of great interest tp power system utilities, forming a gaint for future applications.

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“…It should be noted here that we can design and manufacture a SCG with synchronous reactance at a specified value within the possible range. In order to take advantages of the above properties of SCGs in power system where the stability may become worse, in particular, in the deregulated environment, a lot of research works have so far been done on SCG design and manufacturing (2) (4) (5) , excitation control systems of SCGs (6)- (9) , power system stability improvement by SCG (10) . Installation of SCGs in the power systems becomes one of the topics that should be considered.…”

Section: Introductionmentioning

confidence: 99%

Installation Schemes of Superconducting Generators in Power Systems

Sae-Kok¹,

Yokoyama²

2007

IEEJ Trans. PE

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Superconducting generator (SCG) with superconducting field winding offers various advantages, such as high efficiency, smallsize light weight, and so forth. A prominent one is to improve system stability and voltage stability owing to decreased synchronous reactance compared with conventional generators. Installation of SCGs in the power systems becomes one of the topics that should be considered. It concerns how and where SCGs should be installed and parameters setting of machines and controllers. Many conventional generators in power systems have been operated for many years and they have been nearly about to be reinstalled; replacement of conventional generators by SCGs in power systems might be a possible idea for the locations. It should be noted that it is not practical to replace all conventional generators by SCGs from economic and technical viewpoints; it is, however, necessary to determine appropriate locations and parameters such as synchronous reactance X d of as small as possible number of SCGs. In addition, control parameters such as gain values of AVRs and speed governors should also be selected appropriately.A method for determining optimal locations and synchronous reactance X d of SCG with low response excitation for stability enhancement in multi-machine power system has been proposed in Ref.(1). Eigenvalue sensitivity based parameter optimization technique has been employed to determine optimally synchronous reactance X d and used a specific rule that any generator which has a final synchronous reactance X d less than a threshold value is considered to be the SCG installing location and the determined synchronous reactance is used as the synchronous reactance X d of the SCG. In addition, gains of AVRs and speed governors of generators are also determined by the same parameter optimization technique. However, the method is found to have two main flaws. The first one is at the specific rule that the synchronous reactance of any generator which is not replaced by SCG is set back to the original values; that causes this method not to guarantee that the determined locations are optimal. The second one is that transient open-circuit time constant, which is comparatively very large because of near zero resistance of field winding has not been considered in optimization process. Such method should be modified or improved to obtain more reliable and systematic algorithm.In this paper, new methods for determining optimal locations and parameters of SCGs under multiple load flow conditions in multimachine power system for the purpose of dynamic stability improvement are proposed. Two new methods for installation schemes of SCG with low response excitation are proposed. The method type 1 uses the observation of global inter-area mode and approximated eigenvalue sensitivity to determine installation indices used to determine the SCG location. Synchronous reactance X d (X q ) and transient open-circuit time constant T do are determined later by eigenvalue sensitivity based parameter optimization technique....

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Comparison of transient performance of superconducting and conventional generators in a multimachine system

Cited by 12 publications

References 11 publications

High Side Voltage Controller to Improve Performance and Voltage Stability of a Power System

High Side Voltage Controller to Improve Performance and Voltage Stability of a Power System

Combined FLC and TCSR to en-Nce the Performance of Power Systems Including a Superconducting Generator

Installation Schemes of Superconducting Generators in Power Systems

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