本文選題：多端直流 + 電壓源型換流器�。� 參考：《電網(wǎng)技術(shù)》2015年06期

【摘要】：分析基于電壓源型換流器的多端直流輸電系統(tǒng)(voltage sourced converter multi-terminal DC,VSC-MTDC)現(xiàn)有控制策略(電壓裕度控制與電壓傾斜控制)的特點(diǎn)與不足,提出一種新的基于自律分散思想的控制方法。該方法結(jié)合了上述二種控制方法的優(yōu)點(diǎn),并相互彌補(bǔ)了各自的缺點(diǎn)。正常運(yùn)行時(shí),主導(dǎo)站定直流電壓控制,輔助站定功率控制。一旦主導(dǎo)站因故障丟失,輔助站能夠快速并穩(wěn)定地切換到定電壓控制。由于傾斜特性的引入,各換流站的傳輸功率始終隨直流電壓的變化而變化,且保持固定的比例關(guān)系。因此直流電壓不會(huì)因電壓裕度的選取而產(chǎn)生不同程度的過(guò)調(diào)量。此后輔助站將作為多端系統(tǒng)的平衡節(jié)點(diǎn),吸收/發(fā)出其余端子的功率差額,使系統(tǒng)重新找到新的運(yùn)行點(diǎn)(預(yù)先設(shè)定的最優(yōu)運(yùn)行點(diǎn))。在整個(gè)暫態(tài)過(guò)程中,其余端子能夠始終不受擾動(dòng)的影響而保持正常運(yùn)行,使擾動(dòng)對(duì)直流系統(tǒng)的影響最小化。文中基于PSCAD/EMTDC分別設(shè)計(jì)這3種控制器,并對(duì)其暫穩(wěn)態(tài)特性進(jìn)行仿真分析與詳細(xì)比對(duì)。仿真結(jié)果表明:組合控制改善了系統(tǒng)的暫態(tài)特性,并能夠保證系統(tǒng)在擾動(dòng)前后都始終運(yùn)行在最優(yōu)點(diǎn)。
[Abstract]:This paper analyzes the characteristics and shortcomings of the existing control strategies (voltage margin control and voltage tilting control) for multi-terminal DC transmission system (voltage sourced converter multi-terminal DCSC-MTDC based on voltage source converters, and proposes a new control method based on the idea of autonomous dispersion. This method combines the advantages of the two control methods and makes up for each other's shortcomings. In normal operation, the main station constant DC voltage control, auxiliary station fixed power control. Once the main station is lost due to failure, the auxiliary station can switch to constant voltage control quickly and stably. Because of the introduction of tilting characteristics, the transmission power of each converter station always changes with the DC voltage, and maintains a fixed proportional relationship. Therefore, DC voltage will not cause varying degrees of overshoot due to the selection of voltage margin. After that, the auxiliary station will act as the balance node of the multi-terminal system, absorb / issue the power difference of the other terminals, so that the system can find the new operation point (the pre-set optimal operating point). During the whole transient process, the other terminals can always operate normally without the influence of the disturbance, so as to minimize the impact of the disturbance on the DC system. In this paper, three controllers are designed based on PSCAD / EMTDC, and their transient characteristics are simulated and compared in detail. The simulation results show that the combined control improves the transient characteristics of the system and can ensure that the system always operates in the optimal condition before and after the disturbance.
【作者單位】： 華北電力大學(xué)電氣與電子工程學(xué)院;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(973計(jì)劃)(2012CB215200) 國(guó)家自然科學(xué)基金項(xiàng)目(51177044)~~
【分類號(hào)】：TM721.1

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本文編號(hào)：2081202