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The Research On Low-frequency Oscillation In Power System

Posted on:2007-11-21Degree:MasterType:Thesis
Country:ChinaCandidate:Y F LinFull Text:PDF
GTID:2132360182986866Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
This paper focuses on the method of damping low-frequency oscillation, the analysis of oscillation modes and the design of oscillation damping controller. The main work is as follows:1. Chapter 1 introduces the classification, mechanism, typical failures, research methods and damping methods of low-frequency oscillation in power systems.2. Chapter 2 introduces a method based on the test signal method to design TCSC power oscillation damping (POD) controller. This method can overcome some disadvantages of the eigenvalue analysis method and has been proved to be effective by time domain simulation. It has the following advantages:(1) This method can be implemented by electromechanical simulation conveniently. When used to calculate the inter-area oscillation modes and their residues, this approach avoids the complicated eigensolution of the state matrix that results in heavy computation burden and it cannot be influenced by large system ranks.(2) This method chooses the input signal of TCSC POD controller by the residue ratio method and tunes the controller by compensating the residue phase. Therefore the controller will be more robust to adapt to the power system that has to operate in various conditions.(3) This method can be utilized to design other power oscillation controllers, such as PSS and HVDC small signal modulation controller.3. Chapter 3 introduces the "PSS Design and Checking System Based on PSS/E". The system contains the following:(1) Calculating the oscillation modes, oscillation shapes and participating factors of the East China Power System based on the eigenvalue method and the Prony method.(2) Calculating the excitation phase-frequency characteristic of the generators in Zhejiang based on the test signal method.(3) Designing the PSS based on the phase compensating method.The accuracy of the system to calculate the excitation phase-frequency characteristic is illustrated by the comparison of the calculated and measured results. The effectiveness of the system to design PSS is illustrated by time domain simulation and frequency domain checking.
Keywords/Search Tags:Low-frequency Oscillation, Eigenvalue Analysis Method, Prony Method, Test Signal Method, POD Controller Design, Input Signal Selection, PSS, TCSC, Residue Ratio, East China Power System
PDF Full Text Request
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