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Research on Optimizing Power System Stabilizers Parameters

Author: ZhangLai
Tutor: FangDaZhong
School: Tianjin University
Course: Automation of Electric Power Systems
Keywords: Power System Stabilizer Trajectory Sensitivity Conjugate Gradient Method Parameter optimization
CLC: TM44
Type: Master's thesis
Year: 2005
Downloads: 374
Quote: 3
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Abstract


As the regional power grid interconnection, the low frequency oscillation in power system operation and planning need to consider the important issues. The application of the power system stabilizer (PSS), achieved remarkable results in the suppression of the low-frequency oscillation. The power system is a typical non-linear system. Even if the installation of the PSS controller, the system may also be nonlinear oscillation. Such as Northeast China, North China Power Grid are unknown mechanism of low-frequency oscillations, many experts and scholars are of the view that this is caused due to the power system nonlinear. System interference oscillation mechanism found in the system time-domain response not only exists the basic electromechanical oscillation mode, but also higher-order oscillation mode. Small signal stability analysis ignores the equation of state of the system higher order terms in the Taylor series, the method can not fully reflect the non-linear nature of the system oscillations, based on the small-signal analysis and design of PSS sometimes can not effectively oscillation damping system after large disturbance . Trajectory sensitivity dependence on certain parameters or initial conditions used to study the system dynamic response. This theory has begun to attract the attention of researchers of the power system, becoming the new power system analysis tool. Transient stability studies tradition is to use the time-domain simulation trajectory of the system, based on experience to judge the stability results. The trajectory itself, the lack of a quantitative measure of stability. The trajectory sensitivity theory suitable for fine portrait of the power system state variables dependent parameters, with the simulation program can be given a combination of the guiding principles of the stability control. This paper presents a the PSS design methodology based on time-domain simulation. The method uses time-domain simulation algorithm able to consider the nonlinear characteristics of the power system, the sensitivity analysis and optimization combined with the design of PSS parameters. Generator rotor angular velocity to optimize the objective function, the trajectory sensitivity simulated the gradient of the objective function, and then apply the conjugate gradient optimization technology to optimize the number of PSS parameters. Since the objective function to consider the large disturbance characteristics of the power system, the method can not only inhibit the spontaneous oscillation of small disturbances, and large disturbance caused by the system to be effective in damping oscillation, to improve the system transient stability. PSS parameter optimization method proposed in four typical system on a single machine infinite bus system, three-machine nine-node system, four-11 bus system and the New England system simulation test, simulation results show the practicality of using this method and effectiveness.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Stabilizer
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