本文選題：直流融冰系統(tǒng) + 并行雙回線路　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：輸電線路覆冰嚴(yán)重地危害了電力系統(tǒng)的安全、穩(wěn)定運(yùn)行。作為現(xiàn)有融冰/除冰技術(shù)中最有效、直接的融冰方法，直流融冰技術(shù)受到了國內(nèi)外的廣泛關(guān)注。冬季我國大范圍地區(qū)會(huì)遭受嚴(yán)重的雨雪冰凍天氣，新興的直流融冰技術(shù)在我國電網(wǎng)中得到了推廣應(yīng)用；但是在運(yùn)行調(diào)試過程中出現(xiàn)同塔并行交流線路對(duì)直流融冰線路產(chǎn)生工頻電磁干擾引發(fā)直流融冰系統(tǒng)50Hz保護(hù)異常告警、閉鎖等問題。隨著電網(wǎng)規(guī)模的擴(kuò)大，輸電走廊稀缺，兩回或多回線路同塔并架已成為必然，交流運(yùn)行線路對(duì)直流融冰線路的工頻電磁耦合及其引發(fā)的一系列干擾問題不容忽視。直流融冰技術(shù)發(fā)展時(shí)間不長，對(duì)其電磁兼容性研究還比較薄弱。因此，深入開展交流輸電線路對(duì)鄰近并行直流融冰線路工頻感應(yīng)及其對(duì)直流融冰系統(tǒng)影響的基礎(chǔ)理論研究，提出相應(yīng)的抗干擾措施，對(duì)于增強(qiáng)直流融冰系統(tǒng)的電磁兼容性能、確保直流融冰系統(tǒng)的安全穩(wěn)定運(yùn)行具有理論指導(dǎo)意義。 對(duì)此本文的主要工作如下： ①從理論上分析了直流融冰線路中工頻感應(yīng)分量產(chǎn)生的機(jī)理；采用電磁暫態(tài)仿真軟件PSCAD/EMTDC，選擇頻變傳輸線模型建立了同塔并行雙回線路模型；基于直流融冰系統(tǒng)的工作原理，構(gòu)建直流融冰系統(tǒng)模型，將交流雙回線路中的一回停運(yùn)改接為直流融冰，形成交流線路對(duì)同塔并行直流融冰線路電磁干擾的仿真預(yù)測模型。 ②研究了融冰方式、并行交流輸電線路輸送功率、并行線路長度、并行間距以及換位等因素對(duì)工頻感應(yīng)電流的影響及其影響規(guī)律；分析了融冰線路中工頻感應(yīng)電流對(duì)融冰系統(tǒng)50Hz保護(hù)及換流變壓器的影響，討論并提出了抑制直流融冰系統(tǒng)的工頻感應(yīng)分量的措施。 ③分別對(duì)僅存在交直流線路耦合、僅存在整流器脈沖丟失故障以及既有交直流耦合又發(fā)生脈沖丟失故障三種情況下的融冰系統(tǒng)建立工頻等效電路，對(duì)交直流線路耦合時(shí)的工頻感應(yīng)分量與整流器脈沖丟失故障時(shí)工頻分量進(jìn)行特征提取，提出了附加電壓信息的50Hz保護(hù)優(yōu)化判據(jù)，，仿真驗(yàn)證了優(yōu)化判據(jù)的有效性。
[Abstract]:The icing of transmission lines seriously endangers the safety and stability of the power system. As the most effective and direct ice melting method in the existing ice / deicing technology, direct current thawing technology has been widely concerned at home and abroad. In winter, the large area in China will suffer severe snow and ice weather, and the new DC ice melting technology is in the power grid of China. It has been popularized and applied, but in the process of running and debugging, the frequency electromagnetic interference caused by the parallel transmission line of the same tower on the DC thawing line causes the abnormal alarm and locking of the 50Hz protection in the DC thawing system. With the expansion of the power grid, the transmission corridor is scarce, and the two or multiple circuits are bound to be the same tower and frame. The power frequency electromagnetic coupling and a series of interference problems arising from the line to the DC melting ice line can not be ignored. The development time of the DC thawing technology is not long, and the research on its electromagnetic compatibility is still weak. Therefore, the power frequency induction of the AC transmission line and its influence on the DC ice melting system are deeply carried out. The basic theory research and the corresponding anti-interference measures are of theoretical guiding significance for enhancing the EMC performance of the DC ice melting system and ensuring the safe and stable operation of the DC ice melting system.
The main work of this article is as follows:
(1) the mechanism of the induction component in the DC melting ice line is analyzed theoretically, and the parallel double circuit model of the same tower is established by using the electromagnetic transient simulation software PSCAD/EMTDC, and the model of the parallel double circuit of the same tower is established. Based on the working principle of the DC ice melting system, the model of the DC ice melting system is built, and the one back stop in the AC double circuit line is stopped. The DC model is used to simulate the electromagnetic interference caused by AC transmission lines on parallel parallel DC ice melting lines on the same tower.
Secondly, the influence of the ice melting mode, the parallel transmission line transmission power, the parallel line length, the parallel distance and the transposition and other factors on the power frequency induction current are studied. The influence of the induction current on the 50Hz protection and the change of the rheology pressure in the ice melting system is analyzed, and the suppression of the DC ice melting system is discussed and proposed. The measures of the frequency induction component of the system.
(3) the power frequency equivalent circuit is set up in three cases of only the AC and DC transmission line coupling, only the rectifier pulse loss fault and both AC and DC coupling and the pulse loss fault. The frequency component of the power frequency induction component and the rectifier pulse loss fault in the coupling of AC and DC lines is extracted. The 50Hz protection optimization criterion with additional voltage information is proposed, and the validity of the optimization criterion is verified by simulation.

【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM752

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