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Research on Power System Low Frequency Oscillation Induced by Turbo-Power Changing

Author: LiuPai
Tutor: ZhaoShuQiang
School: North China Electric Power University
Course: Proceedings of the
Keywords: Steam turbine model Low-frequency oscillation The stability of the power system
CLC: TM712
Type: Master's thesis
Year: 2011
Downloads: 76
Quote: 0
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Abstract


Power system stability is a major fundamental problem of the power system , and it is directly related to people's lives and national security . The actual power system operation process , voltage , power angle , line power oscillation have occurred . In recent years , in order to improve power system static stability and voltage quality and the introduction of a large number of fast excitation system , and with the introduction of networking acceleration of the process of the power system and electricity market , the increasing size of the electric power system , run more and more the critical point , the issue of power system oscillations has become a common concern of the electricity and scholars . The power system is constituted by the power grid and power plants as a whole , inseparable , the dynamic characteristics of the power plant boiler and steam turbine speed control system directly affect the output of the generator , thereby affecting the operational status of the entire system . However , the low frequency oscillation is often confined to a grid level , assumed that the power plant output unchanged to study the electrical system isolation . This larger error with the actual situation . Resonance mechanism is one of the reasons of power system low frequency oscillation . For that reason , by contrast study several widely used in the steam turbine power system stability analysis simplified model is proposed for power system simulation and analysis of the improved steam turbine pressure power model , and by analyzing the actual measurement of several common disturbance signal study the main steam pressure disturbance effects of low-frequency oscillation of the power system . The study showed that the periodic disturbance having a continuous amplitude and the same as or similar to the natural oscillation frequency of the frequency and system can cause weak damping system contact online continuous power oscillation . In the case of multiple machines , each machine disturbances can be generated by superimposing momentary substantial impact oscillation and continuous oscillation .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Theory and Analysis > Power system stabilizer
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