發(fā)布時(shí)間：2018-02-10 15:09

  本文關(guān)鍵詞： 交直流電網(wǎng) 電壓穩(wěn)定 在線評(píng)估 無功補(bǔ)償 指標(biāo)　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著高壓直流輸電技術(shù)(HVDC)的應(yīng)用,HVDC與弱交流系統(tǒng)連接的電壓穩(wěn)定問題得到更廣泛的關(guān)注。電力系統(tǒng)電壓穩(wěn)定研究面臨兩個(gè)問題:一是接近距離,即當(dāng)前系統(tǒng)電壓的狀態(tài)距離電壓不穩(wěn)定的狀態(tài)有多接近?二是原因,即什么原因?qū)е孪到y(tǒng)發(fā)生穩(wěn)定問題?電壓水平較弱區(qū)域、較弱節(jié)點(diǎn)是哪些節(jié)點(diǎn)?換言之,電壓穩(wěn)定指標(biāo)應(yīng)能回答:一旦負(fù)荷發(fā)生大的變化引起系統(tǒng)態(tài)勢(shì)惡化,應(yīng)能預(yù)估電網(wǎng)是否可以在事故中不發(fā)生崩潰問題;若需要提前預(yù)防電壓失穩(wěn)問題,應(yīng)該了解什么方法可以改善電壓水平。所以,電壓穩(wěn)定指標(biāo)應(yīng)能給出電壓安全性的尺度,可以更好地為提高系統(tǒng)運(yùn)行能力、預(yù)防電壓崩潰事故的發(fā)生提供決策依據(jù)。本文從在線監(jiān)視的角度出發(fā),立足本地測(cè)量,研究新型靜態(tài)電壓穩(wěn)定指標(biāo)和電壓態(tài)勢(shì)所處失穩(wěn)模式的評(píng)估問題,并分析指標(biāo)在各種交、直流條件變化時(shí)的適應(yīng)性。為降低在線監(jiān)視過程對(duì)通訊和控制網(wǎng)絡(luò)的過度復(fù)雜化依賴,本文首先探討了如何利用負(fù)荷母線本地量測(cè)構(gòu)建靜態(tài)電壓穩(wěn)定指標(biāo)的問題。在分析了負(fù)荷母線最大供電能力與等效系統(tǒng)諾頓電流分配關(guān)系的基礎(chǔ)上,得出了最大供電能力條件與等效系統(tǒng)均分諾頓電流分別供給等效電源自身和外部負(fù)荷等價(jià)的結(jié)論�；诖私Y(jié)論,構(gòu)建了僅利用負(fù)荷母線電壓、電流幅值量測(cè)信息的靜態(tài)電壓穩(wěn)定評(píng)估指標(biāo)。該指標(biāo)無需監(jiān)測(cè)相位且不依賴于外部網(wǎng)絡(luò)等值,極大地降低了系統(tǒng)實(shí)施與管控的技術(shù)難度與成本。能夠在線實(shí)時(shí)監(jiān)視負(fù)荷母線電壓穩(wěn)定態(tài)勢(shì)及母線相連負(fù)荷進(jìn)線能力裕度到限情況,便于及時(shí)發(fā)現(xiàn)電網(wǎng)電壓薄弱的節(jié)點(diǎn)及其關(guān)聯(lián)的輸配電能力危急的路徑。為進(jìn)一步研究所構(gòu)建的電壓穩(wěn)定評(píng)估指標(biāo)在各種交流系統(tǒng)變工況條件下的適用性,論文綜合分析了無功補(bǔ)償、有載調(diào)壓變壓器分接頭調(diào)節(jié)、發(fā)電機(jī)勵(lì)磁調(diào)節(jié)等方式下指標(biāo)的變化情況,并通過實(shí)際電網(wǎng)數(shù)據(jù)仿真驗(yàn)證了評(píng)估指標(biāo)在各種典型變工況條件均有效的結(jié)論。在獲得電壓穩(wěn)定指標(biāo)能夠?qū)崟r(shí)反映系統(tǒng)穩(wěn)定狀態(tài)的基礎(chǔ)上,研究了負(fù)荷陡變時(shí)指標(biāo)的實(shí)時(shí)追蹤問題。為研究指標(biāo)在交、直流電網(wǎng)中的適用性,建立了直流控制系統(tǒng)模型,通過對(duì)直流系統(tǒng)控制方式的改變考察了不同直流輸送功率條件時(shí),交流系統(tǒng)負(fù)荷母線(換流站母線)指標(biāo)變化情況,得到了所構(gòu)建指標(biāo)同樣適用于監(jiān)視交、直流系統(tǒng)電壓穩(wěn)定態(tài)勢(shì)的結(jié)論。最后,綜合直流控制、無功補(bǔ)償、有載調(diào)壓變壓器分接頭調(diào)節(jié)、發(fā)電機(jī)勵(lì)磁調(diào)節(jié)等方式,通過實(shí)際電網(wǎng)數(shù)據(jù)仿真驗(yàn)證了電壓穩(wěn)定評(píng)估指標(biāo)的有效性。
[Abstract]:With the application of HVDC (HVDC) technology, the problem of voltage stability of HVDC connected to weak AC system has been paid more and more attention. There are two problems in the study of voltage stability in power system: one is the close distance, the other is the distance between HVDC and weak AC system. That is, how close is the state of the current system voltage to the unstable state of the range voltage? The second is the reason, that is, what causes the stability of the system? Which nodes are the weaker nodes in the weaker voltage level region? In other words, the voltage stability index should be able to answer: once the load changes cause the system situation to deteriorate, it should be able to estimate whether the power network can not collapse in the accident; if the voltage instability problem needs to be prevented in advance, It is important to understand what methods can improve the voltage level. Therefore, the voltage stability index should be able to give a voltage security scale, which can better improve the performance of the system. In this paper, from the point of view of on-line monitoring, based on local measurement, the evaluation of new static voltage stability index and the instability mode of voltage situation are studied, and the intersections of the indexes are analyzed. Adaptability when DC conditions change. In order to reduce the over-complicating dependence of online surveillance processes on communications and control networks, In this paper, the problem of how to construct static voltage stability index by using local measurement of load busbar is discussed, and the relationship between the maximum power supply capacity of load bus and Norton current distribution of equivalent system is analyzed. It is concluded that the maximum power supply condition is equivalent to the Norton current of the equivalent system and the equivalent power supply itself is equivalent to the external load. Based on this conclusion, only the load busbar voltage is constructed. The static voltage stability evaluation index of current amplitude measurement information. This index does not need to monitor the phase and does not depend on the external network equivalent. It greatly reduces the technical difficulty and cost of system implementation and control. It can monitor the voltage stability situation of load bus and the capacity margin of connecting load line to limit on line. It is convenient to find out in time the node with weak voltage and the critical path of its associated transmission and distribution capacity. The applicability of the voltage stability evaluation index constructed for further research under various AC system off-condition conditions, In this paper, the variation of reactive power compensation, tap adjustment of on-load transformer, excitation regulation of generator and so on are analyzed. Through the simulation of the actual power network data, the conclusion that the evaluation index is effective in various typical off-condition conditions is verified, and the voltage stability index can reflect the stable state of the system in real time. In order to study the applicability of the indexes in AC and DC networks, a DC control system model is established, and the different DC transmission power conditions are investigated by changing the control mode of the DC system. The change of AC system load busbar (converter bus) index is obtained, and the conclusion that the constructed index is also suitable for monitoring AC and DC system voltage stability situation is obtained. Finally, comprehensive DC control, reactive power compensation, The effectiveness of voltage stability evaluation index is verified by simulation of actual power network data by tap adjustment of on-load transformer and excitation regulation of generator.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM712

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本文編號(hào)：1500804