Research on the Transient Stability Influenced by Wind Farm Access Nodes Based on Dynamic Security Region
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The access of renewable energy such as wind power brings more challenges to the safe operation of the power system. In this paper, the basic construction method of dynamic security region (DSR) boundary is introduced. This paper analyzes the differences in the dynamic security regions by changing access nodes. It is concluded that the distance between the access node and the balancer is negatively related to the transient stability of the power system. Test results on the New England 3-genrator 9-bus system are presented and prove the correctness of the conclusion.Keywords:
Transient (computer programming)
This paper presents a model of a multi-machine system and examines the efficacy of power system stabilisers and static VAR compensator in transient stability enhancement. The main contribution of this work is a compact, user-friendly and comprehensive model to analyse and reinforce the system stability through a coordinated focus on damping of electromechanical oscillations and suppression of voltage deviations. The model is developed by integration of various mathematical equations pertaining to synchronous machines and some network equations. To test the effectiveness of the proposed model, MATLAB-based simulations are carried out by subjecting the system to challenging transients. The performance evaluation of the model incorporating both power system stabilisers and static VAR compensator is tested against the individual performance of each. It is found that the model is effective in maintaining transient stability as well as improving transient stability limits.
Transient (computer programming)
Static VAR compensator
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The basic characteristics of power system transient stability, the function and feature, and mathematical model of power system blockset and Simulink based on MATLAB are introduced in the paper. MATLAB SimPowerSystems are used to build up Simulink models of a three-machine system. Powerful functions of Matlabinthesimulationofpowersystemareshownbythesimulation of power system failure. The result shows that the dynamic behavior of power system during transient processes can be observed quite accuratelyanddirectly.
Transient (computer programming)
Power system simulation
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Relative correctness is the property of a program to be more-correct than another with respect to a specification, whereas traditional (absolute) correctness distinguishes between two classes of candidate programs with respect to a specification (correct and incorrect), relative correctness defines a partial ordering between candidate programs, whose maximal elements are the (absolutely) correct programs. In this paper we argue that relative correctness ought to be an integral part of the study of program repair, as it plays for program repair the role that absolute correctness plays for program construction: in the same way that absolute correctness is the criterion by which we judge the process of deriving a program P from a specification R, we argue that relative correctness ought to be the criterion by which we judge the process of repairing a program P to produce a program P' that is more-correct than P with respect to R. In this paper we build on this premise to design a generic program repair algorithm, which proceeds by successive increases of relative correctness until we achieve absolute correctness. We further argue that in the same way that correctness ideas were used, a few decades ago, as a basis for correct-by-design programming, relative correctness ideas may be used, in time, as a basis for more-correct-by-design program repair.
Basis (linear algebra)
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Continuation
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As the number of consumers of electricity increases the electric power generated required to serve the consumers increases. Due to the long distance transmission of the generated power the power system becomes complex. That is why HVDC transmission system used for long distance carriage of power. During transmission of HVDC system protection and security of the system is compulsory in order to minimize the overall losses. This review paper discusses the protection of HVDC line based on transient energy and transient power. The fault which is occurred on the system reflected on three main parts of the system. Using modified traveling wave algorithm the transient parameters are determined and the type and location of fault can be detected. The simulation is done using PSCAD/EMTDC, MATLAB/Simulink. Motivation/Background: Due to the complication of a power system, HVDC power transmission system was chosen. But the system needs protection to secure the transportation of the needed amount of power. Method: In this review paper a modified travelling wave algorithm is used to detect the faults. Results: The result from the output of the algorithm shows the transient power and energy came to stability within short time. Conclusions: By detecting the transient power and energy, it can easily be protect the system from severe problem.
Transient (computer programming)
Power transmission
Transmission system
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Auto-reclosing is one of the main methods to improve the stability and reliability of power systems. For a transient fault, people generally believe that the earlier the reclosing time, the better the system stability will be. A new application of the transient energy function (TEF) is introduced in this paper to analyze the influence of reclosing time on power system stability and the results show that there exists an optimal reclosing time. The transient energy of the system is minimum when reclosing at the optimal time. Though the TEF of power systems is deduced from classical models, simulation results show that the optimal reclosing time calculated from TEF is also valid in complex model systems. Simulation results of a realistic system (46 generators and 230 buses) show that the method proposed in this paper is very effective for giving the correct optimal reclosing time of transient faults and that the oscillations of the generator angle and transmission line power can be largely damped when reclosing at that time.
Transient (computer programming)
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Relative correctness is the property of a program to be more-correct than another with respect to a given specification. Whereas the traditional definition of (absolute) correctness divides candidate program into two classes (correct, and incorrect), relative correctness arranges candidate programs on the richer structure of a partial ordering. In other venues we discuss the impact of relative correctness on program derivation, and on program verification. In this paper, we discuss the impact of relative correctness on program testing; specifically, we argue that when we remove a fault from a program, we ought to test the new program for relative correctness over the old program, rather than for absolute correctness. We present analytical arguments to support our position, as well as an empirical argument in the form of a small program whose faults are removed in a stepwise manner as its relative correctness rises with each fault removal until we obtain a correct program.
Argument (complex analysis)
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This paper introduces the working principle and the mathematical model of additional power system excitation control-Power System Stabilizer (PSS). Through established a typical single machine-infinite bus power system simulation model, we simulate the synchronous generator’s transient operational characteristics following a severe disturbance. The simulation results show that the PSS can not only effectively increase the system damping, but also improve operational characteristics of the generator, considerably enhance power system dynamic and transient stability.
Transient (computer programming)
Stabilizer (aeronautics)
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Coverage-based fault localization is a spectrum-based technique that identifies the executing program elements that correlate with failure. However, the effectiveness of coverage-based fault localization suffers from the effect of coincidental correctness which occurs when a fault is executed but no failure is detected. Coincidental correctness is prevalent and proved as a safety reducing factor for the coverage-based fault location techniques. In this paper, we propose a new fault-localization approach based on the coincidental correctness probability. We estimate the probability that coincidental correctness happens for each program execution using dynamic data-flow analysis and control-flow analysis. To evaluate our approach, we use safety and precision as evaluation metrics. Our experiment involved 62 seeded versions of C programs from SIR. We discuss the comparison results with Tarantula and two improved CBFL techniques cleansing test suites from coincidental correctness. The results show that our approach can improve the safety and precision of the fault-localization technique to a certain degree.
Control flow
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The distance of electricity transmission gets longer and longer, and capacity is also increasing, the voltage level by transport is becoming more and more high, while the stability problem of power system is more and more prominent. If the power system's stability is destroyed, that can cause blackouts, and it will form a very serious accident. This paper uses a single and infinite system as the object, which is modeling. Simulation experiment, analysis for the stability of transient. In addition, the limit removal time under different fault types, the influence of electric parameters which changes on transient stability is studied. Through the research, we gets a meaningful conclusion, that can help study further measures for improving the transient stability of power system.
Transient (computer programming)
Transmission system
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