دانلود ترجمه مقاله سنجش تکنیک های متفاوت جهت طرح تثبیت کننده سیستم قدرت

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Abstract

The major problem in power system operation is related to small signal instability caused by insufficient damping in the system. The most effective way of countering this instability is to use auxiliary controllers called power system stabilizers, to produce additional damping during low frequency oscillations in the system. Heffron-Phillip’s Model of a synchronous machine is commonly used in small signal stability analysis. Different techniques for designing of power system stabilizer is proposed for Modified Heffron-Phillip’s model, the parameters of the power system stabilizer has been tuned by the three ways , linear quadratic power system stabilizer, genetic algorithm power system stabilizer and proposed power system stabilizer. The efficiency of the proposed design technique and the performance of the stabilizer has been evaluated over a range of operating and system conditions and the performance of the proposed controller is much better than the linear quadratic power system stabilizer and genetic algorithm based power system stabilizer.

Keywords: Modified Heffron-Phillip’s model (Mod HP), Heffron-Phillip’s model (HP), Power System Stabilizers (PSS), Single Machine connected Infinite Bus (SMIB), Linear Quadratic regulator (LQR), Genetic Algorithm (GA).

Introduction

Electric power systems are highly nonlinear systems and constantly experience changes in generation, transmission and load conditions. With the enormous increase in the demand for the electricity almost all major transmission networks in the world are operated close to their stability limits. In such systems fast excitation control plays a crucial role. The excitation controllers are designed to regulate the terminal voltage. Automatic voltage regulators also enhance the overall stability of the system. Over the years a variety of design procedures and algorithms have been proposed for the design of power system stabilizers for different models of power system. In order to reduce this instability effect and improve the system stability performance it is useful to introduce supplementary stabilizing signals at low frequency oscillations, to increase the damping torque of the synchronous machine [1], [2], [3]. Different approaches have been proposed in the literature to provide the damping torque required for improving the stability, the first proposed method is the linear quadratic power system stabilizer [4] it is based on the linear optimal control theory, second method proposed power system stabilizer based on the genetic algorithm [7] and the third proposed power system stabilizer method based on pole placement technique [8].

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