【摘要】：高壓直流輸電技術(shù)的廣泛應(yīng)用,使得直流系統(tǒng)建模成為該領(lǐng)域的研究重點(diǎn)。換流器作為直流系統(tǒng)最重要的器件,其模型的準(zhǔn)確性直接決定了直流系統(tǒng)建模的有效性。傳統(tǒng)的換流器開(kāi)關(guān)函數(shù)模型應(yīng)用于交流系統(tǒng)非對(duì)稱運(yùn)行狀態(tài)時(shí),計(jì)算精度降低。為了提高換流器開(kāi)關(guān)函數(shù)模型的計(jì)算精度,本文詳細(xì)分析了三相非對(duì)稱運(yùn)行狀態(tài)下?lián)Q流器的換相過(guò)程,并著重考慮了直流側(cè)二次諧波電流對(duì)換相持續(xù)時(shí)間的影響,建立了考慮閥導(dǎo)通偏移和換相角不等的換流器開(kāi)關(guān)函數(shù)模型,相較傳統(tǒng)的換流器開(kāi)關(guān)函數(shù)模型,本文建立的模型能夠顯著提高分析精度。本文所建立的考慮交流非對(duì)稱情況的HVDC換流器開(kāi)關(guān)函數(shù)模型,在三個(gè)方面進(jìn)行了應(yīng)用：第一,將所建立的換流器開(kāi)關(guān)函數(shù)模型應(yīng)用于動(dòng)態(tài)相量理論中。采用從PSCAD中采樣、利用動(dòng)態(tài)相量理論在MATLAB下編程實(shí)現(xiàn)計(jì)算,對(duì)換流器開(kāi)關(guān)函數(shù)模型在動(dòng)態(tài)相量理論中的應(yīng)用進(jìn)行了初探,驗(yàn)證了動(dòng)態(tài)相量理論的分析精度的可靠性。第二,采用考慮交流非對(duì)稱的換流器開(kāi)關(guān)函數(shù)模型進(jìn)行含直流饋入的交流系統(tǒng)故障分析研究。進(jìn)一步建立了直流側(cè)等值諧波阻抗模型及直流控制系統(tǒng)穩(wěn)態(tài)響應(yīng)模型,形成適用于交流系統(tǒng)故障計(jì)算的直流系統(tǒng)模型,并與傳統(tǒng)的交流系統(tǒng)故障分析模型聯(lián)立,形成了最終的含直流饋入的交流系統(tǒng)故障分析模型,通過(guò)仿真與計(jì)算驗(yàn)證了模型的有效性以及求解算法的收斂可靠性。第三,針對(duì)交流系統(tǒng)故障引發(fā)直流換相失敗機(jī)理展開(kāi)深入分析�；贖VDC換流器開(kāi)關(guān)函數(shù)建模中對(duì)換流閥換相過(guò)程的分析,進(jìn)一步分析了交流故障瞬間換流閥的實(shí)際觸發(fā)導(dǎo)通過(guò)程,在此基礎(chǔ)上,對(duì)交流系統(tǒng)故障引發(fā)直流換相失敗的機(jī)理進(jìn)行分析,提出了一種換相失敗的預(yù)測(cè)方法,基于所做的對(duì)交流故障引發(fā)直流換相失敗的機(jī)理分析,可以為解釋換相失敗下的一些特性提供理論參考。
[Abstract]:With the wide application of HVDC transmission technology, DC system modeling has become the research focus in this field. As the most important device of DC system, the accuracy of converter model directly determines the validity of DC system modeling. When the traditional switching function model of converter is applied to the asymmetrical running state of AC system, the calculation precision is reduced. In order to improve the accuracy of the switching function model of the converter, the commutation process of the converter under the condition of three-phase asymmetrical operation is analyzed in detail, and the effect of the second harmonic current on the duration of the commutator is emphatically considered. The switching function model of converter considering valve conduction offset and phase changing angle is established. Compared with the traditional switching function model, the model established in this paper can improve the analysis accuracy significantly. In this paper, the switching function model of HVDC converter considering AC asymmetry is applied in three aspects. Firstly, the switching function model is applied to the dynamic phasor theory. Sampling from PSCAD and programming under MATLAB using dynamic phasor theory, the application of switch function model of converter in dynamic phasor theory is discussed, and the reliability of dynamic phasor theory is verified. Secondly, a switching function model considering AC asymmetry is used to analyze the fault of AC system with DC feed. The equivalent harmonic impedance model of DC side and the steady-state response model of DC control system are further established to form a DC system model suitable for the fault calculation of AC system, and it is combined with the traditional fault analysis model of AC system. The final fault analysis model of AC system with DC feed is formed. The validity of the model and the convergence reliability of the algorithm are verified by simulation and calculation. Thirdly, the mechanism of DC commutation failure caused by AC system fault is analyzed. Based on the analysis of commutation process in HVDC converter switch function modeling, the actual trigger conduction process of AC fault instantaneous converter valve is further analyzed. The mechanism of DC commutation failure caused by AC system fault is analyzed, and a prediction method of commutative failure is proposed, which is based on the mechanism analysis of DC commutation failure caused by AC fault. It can provide a theoretical reference for explaining some characteristics of commutation failure.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM721.1;TM46

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