本文關(guān)鍵詞：無源網(wǎng)絡(luò)接入MMC-HVDC的模糊自適應(yīng)PI控制策略研究　出處：《武漢大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 柔性直流輸電 模塊化多電平換流器 控制策略 無源網(wǎng)絡(luò) 模糊自適應(yīng)PI控制

【摘要】：在實際生活中,我們通常使用該地的柴油發(fā)電機或燃氣輪機來為遠離陸地的孤島或者鉆井平臺等無源網(wǎng)絡(luò)提供電能。但是此類發(fā)電機的輸電效率通常不高,導(dǎo)致其構(gòu)成供電系統(tǒng)的安全無法達到期望的效果。因此對于此類無源網(wǎng)絡(luò),通過大電網(wǎng)對無源網(wǎng)絡(luò)供電會是更安全可靠和經(jīng)濟性高的方式�；谀K化多電平的高壓直流輸電系統(tǒng)(MMC-HVDC)是一種新型的柔性直流輸電方式,電壓源換流器采用可關(guān)斷器件可以實現(xiàn)自換相,這種結(jié)構(gòu)的換流器兼具能夠靈活操作和在高密度情況下輸電等優(yōu)點,可以很好的解決以上問題,所以采用電壓源換流器十分適合向無源網(wǎng)絡(luò)供電。本文首先闡述了課題背景、研究意義和國內(nèi)外研究現(xiàn)狀,與傳統(tǒng)的兩電平換流器和箝位型多電平換流器相比較,模塊化多電平換流器(MMC)的技術(shù)性能更為理想,以及其功能特性上所有的諸多優(yōu)勢,使得MMC更加適合我國實際工程中的高壓柔性直流輸電系統(tǒng)。接著論文研究了 MMC-HVDC系統(tǒng)拓撲結(jié)構(gòu)、運行機理、工作特性和控制方式,介紹了適用于MMC的調(diào)制方式,重點介紹了 NLM(最近電平逼近),并將NLM選為本文所適用的調(diào)制策略。其次建立了在保持交流電壓穩(wěn)定時的MMC-HVDC系統(tǒng)的數(shù)學模型,在此模型上研究了 MMC-HVDC系統(tǒng)的多種控制策略并且設(shè)計了相應(yīng)的控制器,從換流站級控制策略和換流閥級控制策略兩個方面進行研究,設(shè)計了接入無源網(wǎng)絡(luò)的穩(wěn)態(tài)運行時的控制策略,即接入無源網(wǎng)絡(luò)側(cè)MMC采用定交流電壓控制和定頻率控制,系統(tǒng)側(cè)MMC采用定直流電壓控制及定無功功率控制。然后詳細研究了模糊控制的原理、結(jié)構(gòu)和不同類型,并且對比了一般模糊控制和模糊自適應(yīng)控制的區(qū)別,模糊自適應(yīng)控制能夠彌補一般模糊控制規(guī)則粗糙或者不夠完善的缺陷。因此論文將模糊控制和PI控制兩者結(jié)合設(shè)計了模糊自適應(yīng)PI控制器,并將模糊自適應(yīng)PI控制器應(yīng)用于接入無源網(wǎng)絡(luò)的MMC-HVDC逆變側(cè)的外環(huán)控制器上。在PSCAD上搭建了基于模糊自適應(yīng)PI控制的無源網(wǎng)絡(luò)接入MMC-HVDC的系統(tǒng)模型,對穩(wěn)態(tài)情況和故障情況下分別進行了仿真驗證,最后的結(jié)果證明了本文提出的控制策略的有效性,使得無源網(wǎng)絡(luò)接入MMC-HVDC后能夠有良好的動態(tài)響應(yīng)和抗干擾性,驗證了對于系統(tǒng)整體性能的改進,模糊自適應(yīng)PI控制器有很實際的可行性。
[Abstract]:In real life, we usually use diesel generators or gas turbines to power passive networks far from land, such as isolated islands or drilling platforms, but the transmission efficiency of such generators is usually low. As a result, the safety of the power supply system can not achieve the desired results. Therefore, for such passive networks. It is more safe, reliable and economical to supply power to passive network through large power grid. MMC-HVDC based on modularized multilevel HVDC is a new flexible DC transmission mode. The voltage source converter can use turn-off device to realize self-commutation. This kind of converter has the advantages of flexible operation and transmission under high density, so it can solve the above problems well. Therefore, voltage source converter is very suitable for power supply to passive network. Firstly, this paper describes the subject background, research significance and domestic and foreign research status. Compared with traditional two-level converters and clamped multilevel converters, the modular multilevel converters (MMCs) have better technical performance and many advantages in their functional characteristics. It makes MMC more suitable for HVDC system in our country. Then, this paper studies the topology, operation mechanism, working characteristics and control mode of MMC-HVDC system. The modulation mode suitable for MMC is introduced, with emphasis on NLM (nearest level approximation). NLM is chosen as the suitable modulation strategy in this paper. Secondly, the mathematical model of MMC-HVDC system is established when the AC voltage is stable. In this model, the various control strategies of MMC-HVDC system are studied and the corresponding controllers are designed. The control strategy of converter station level and the control strategy of converter valve level are studied from two aspects: the control strategy of converter station and the control strategy of converter valve level. A control strategy is designed to access the passive network when it is running stably, that is, the constant AC voltage control and the constant frequency control are used to access the passive network side MMC. The system side MMC adopts constant DC voltage control and constant reactive power control. Then, the principle, structure and different types of fuzzy control are studied in detail, and the differences between general fuzzy control and fuzzy adaptive control are compared. Fuzzy adaptive control can make up for the defects of rough or imperfect fuzzy control rules. Therefore, fuzzy adaptive Pi controller is designed by combining fuzzy control and Pi control in this paper. The fuzzy adaptive Pi controller is applied to the outer loop controller of MMC-HVDC inverter side to access the passive network. The passive network access M based on fuzzy adaptive Pi control is built on PSCAD. The system model of MC-HVDC. Finally, the simulation results show the effectiveness of the proposed control strategy. The passive network can have good dynamic response and anti-jamming after accessing to MMC-HVDC. It is proved that the fuzzy adaptive Pi controller is feasible to improve the overall performance of the system.
【學位授予單位】：武漢大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM721.1;TM46

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