本文選題：勵磁系統(tǒng)　切入點(diǎn)：參數(shù)辨識　出處：《華北電力大學(xué)》2014年碩士論文

【摘要】：同步發(fā)電機(jī)的勵磁系統(tǒng)對電力系統(tǒng)的安全穩(wěn)定及經(jīng)濟(jì)運(yùn)行至關(guān)重要,其模型及參數(shù)是否準(zhǔn)確關(guān)系到電力系統(tǒng)仿真計算的可信度,進(jìn)而影響到以此為依據(jù)的實(shí)際工程應(yīng)用。傳統(tǒng)的勵磁系統(tǒng)離線建模及參數(shù)測試方法已越來越不能適應(yīng)電力系統(tǒng)發(fā)展的要求,而隨著相量測量單元(PMU)和廣域測量系統(tǒng)(WAMS)的發(fā)展,實(shí)時獲取電力系統(tǒng)的同步相量數(shù)據(jù)已十分便捷,這為電力系統(tǒng)元件的在線建模及參數(shù)辨識提供了一個有效的平臺和數(shù)據(jù)來源。 本文利用相量測量單元PMU記錄的電網(wǎng)擾動激勵下勵磁系統(tǒng)的動態(tài)同步數(shù)據(jù),開展了勵磁系統(tǒng)模型參數(shù)辨識的可行性研究。首先,從模型及激勵的頻域特征的角度,分析了勵磁模型可降階或轉(zhuǎn)換的頻域條件,并結(jié)合常見電網(wǎng)擾動激勵的頻率特征,深入研究了電網(wǎng)擾動激勵下常用勵磁模型及其參數(shù)的數(shù)值可辨識性,并用時域分析方法驗(yàn)證了所得結(jié)論,且所述分析方法有別于現(xiàn)有的可辨識性的理論分析和數(shù)值判斷法。其次,分析了動態(tài)PMU同步數(shù)據(jù)質(zhì)量對參數(shù)辨識的影響,一定程度上理論闡釋了隨機(jī)量測誤差及系統(tǒng)輸入輸出數(shù)據(jù)的不同步對參數(shù)辨識影響的機(jī)理。再次,考慮到PMU數(shù)據(jù)會存在壞數(shù)據(jù)且實(shí)際量測誤差難以確定,提出了基于輸出誤差準(zhǔn)則的自適應(yīng)抗差參數(shù)辨識方法,仿真表明所提方法是有效的且基于IGG權(quán)函數(shù)的抗差方法具有更好的抑制噪聲和抗差能力。最后,歸納提出了計及非線性環(huán)節(jié)的參數(shù)分類辨識策略,并從勵磁電壓曲線擬合效果的角度初步仿真研究了基于大擾動PMU數(shù)據(jù)整體辨識計及非線性環(huán)節(jié)的勵磁參數(shù)的可行性。
[Abstract]:The excitation system of synchronous generator is very important to the safety, stability and economic operation of power system. Whether its model and parameters are accurate or not is related to the reliability of power system simulation. The traditional off-line modeling and parameter testing methods of excitation system have become more and more unable to meet the requirements of power system development, but with the development of phasor measurement unit (PMU) and wide area measurement system (WAMS), It is very convenient to obtain synchronous phasor data of power system in real time, which provides an effective platform and data source for on-line modeling and parameter identification of power system components. In this paper, the feasibility of parameter identification of excitation system model is studied by using the dynamic synchronous data of excitation system under disturbance excitation recorded by phasor measurement unit (PMU). Firstly, from the angle of model and frequency domain characteristic of excitation, In this paper, the frequency domain condition of reducing or converting the excitation model is analyzed, and the numerical identifiability of the common excitation model and its parameters under the power grid disturbance excitation is deeply studied, combining with the frequency characteristics of the common power grid disturbance excitation. The conclusion is verified by time domain analysis method, and the method is different from the existing identifiability theory analysis and numerical judgment method. Secondly, the effect of dynamic PMU synchronous data quality on parameter identification is analyzed. To a certain extent, the mechanism of the influence of random measurement error and the non-synchronization of system input and output data on parameter identification is explained theoretically. Thirdly, considering that the PMU data will have bad data and the actual measurement error is difficult to determine, An adaptive robust parameter identification method based on the output error criterion is proposed. The simulation results show that the proposed method is effective and the robust method based on IGG weight function has better noise suppression and robust capability. A parameter classification and identification strategy considering nonlinear links is proposed, and the feasibility of global identification of excitation parameters based on large disturbance PMU data and nonlinear link is preliminarily simulated from the point of view of the effect of excitation voltage curve fitting.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM31

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 王志群,朱守真,樓鴻祥,沈善德,張龍英;基于時域分段線性多項(xiàng)式法的大型汽輪機(jī)建模和參數(shù)辨識[J];中國電機(jī)工程學(xué)報;2003年04期

2 徐東杰,賀仁睦,高海龍;基于迭代PRONY算法的傳遞函數(shù)辨識[J];中國電機(jī)工程學(xué)報;2004年06期

3 鞠平;郭磊;高昌培;陳謙;寧艷;孫斌;趙澤;;頻域靈敏度及其在電力系統(tǒng)參數(shù)辨識中的應(yīng)用[J];中國電機(jī)工程學(xué)報;2010年28期

4 吳文傳;郭燁;張伯明;;指數(shù)型目標(biāo)函數(shù)電力系統(tǒng)抗差狀態(tài)估計[J];中國電機(jī)工程學(xué)報;2011年04期

，

本文編號：1698978