In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been ...In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been presented to improve the power system stability. Single machine infinite bus (SMIB) system with SVC located at the terminal of generator has been considered to evaluate the proposed SVC and PSS controllers. The coefficients of PSS and SVC controller have been optimized by Chaos, PSO and SFL algorithms. Fi-nally the system with proposed controllers is simulated for the special disturbance in input power of genera-tor, and then the dynamic responses of generator have been presented. The simulation results show that the system composed with recommended controller has outstanding operation in fast damping of oscillations of power system and describes an application of Chaos, PSO and SFL algorithms to the problem of designing a Lead-Lag controller used in PSS and SVC in power system.展开更多
Context is a very important concept or term both in SFL and in pragmatics.But it has to be understood differently in the two disciplines.This paper attempts to demonstrate the differences and show that context in the ...Context is a very important concept or term both in SFL and in pragmatics.But it has to be understood differently in the two disciplines.This paper attempts to demonstrate the differences and show that context in the two different disciplines can be complementary to each other based on the differences.展开更多
There are quite a few students in China are incompetent to organize text in a cohesive and coherent way in English writ-ing. This essay gives a general introduction of systemic functional linguistics theory, aiming at...There are quite a few students in China are incompetent to organize text in a cohesive and coherent way in English writ-ing. This essay gives a general introduction of systemic functional linguistics theory, aiming at emphasizing the feasibility of apply-ing SFL as a tool to improve the English writing proficiency of students in China.展开更多
文摘In this paper, the Authors present the designing of power system stabilizer (PSS) and static var compensator (SVC) based on chaos, particle swarm optimization (PSO) and shuffled frog leaping (SFL) Algorithms has been presented to improve the power system stability. Single machine infinite bus (SMIB) system with SVC located at the terminal of generator has been considered to evaluate the proposed SVC and PSS controllers. The coefficients of PSS and SVC controller have been optimized by Chaos, PSO and SFL algorithms. Fi-nally the system with proposed controllers is simulated for the special disturbance in input power of genera-tor, and then the dynamic responses of generator have been presented. The simulation results show that the system composed with recommended controller has outstanding operation in fast damping of oscillations of power system and describes an application of Chaos, PSO and SFL algorithms to the problem of designing a Lead-Lag controller used in PSS and SVC in power system.
文摘Context is a very important concept or term both in SFL and in pragmatics.But it has to be understood differently in the two disciplines.This paper attempts to demonstrate the differences and show that context in the two different disciplines can be complementary to each other based on the differences.
文摘There are quite a few students in China are incompetent to organize text in a cohesive and coherent way in English writ-ing. This essay gives a general introduction of systemic functional linguistics theory, aiming at emphasizing the feasibility of apply-ing SFL as a tool to improve the English writing proficiency of students in China.
