【摘要】：為了維持模塊化多電平換流器多端直流輸電系統(tǒng)的電壓穩(wěn)定及換流站間功率的平衡,提出一種基于微分平坦理論的自適應(yīng)斜率控制策略�？刂破鞣譃榍梆侂p環(huán)控制和動態(tài)誤差反饋控制:前饋控制根據(jù)系統(tǒng)期望平坦輸出參考軌跡和系統(tǒng)狀態(tài)變量及輸入變量之間的函數(shù)關(guān)系,得到控制系統(tǒng)的主導(dǎo)控制量;誤差線性反饋控制可以消除系統(tǒng)擾動和外界干擾對規(guī)劃軌跡的影響,增強(qiáng)系統(tǒng)響應(yīng)速度和穩(wěn)態(tài)暫態(tài)特性。最后建立五端MMC-MTDC模型,分別在穩(wěn)態(tài)潮流翻轉(zhuǎn)和主站故障退出2種工況下進(jìn)行仿真驗證。結(jié)果表明該控制策略可以根據(jù)電壓變化方向及換流站裕度對下垂曲線斜率實時控制,避免換流站滿載甚至過載運行,達(dá)到各個換流站之間功率的最優(yōu)分配。
[Abstract]:In order to maintain the voltage stability of modularized multilevel converter multiterminal HVDC transmission system and the balance of power between converter stations, an adaptive slope control strategy based on differential flatness theory is proposed. The controller is divided into feedforward double loop control and dynamic error feedback control. The feedforward control obtains the dominant control quantity of the control system according to the function relationship between the system expected flat output reference trajectory and the system state variables and input variables. The error linear feedback control can eliminate the influence of system disturbance and external disturbance on the planning trajectory and enhance the system response speed and steady-state transient characteristics. Finally, a five-terminal MMC-MTDC model is established, which is simulated under two conditions of steady power flow reversal and main station fault exit respectively. The results show that the control strategy can real-time control the slope of the sag curve according to the direction of voltage change and the margin of converter station, avoid the full-load or even overload operation of converter station, and achieve the optimal distribution of power among different converter stations.
【作者單位】： 華東交通大學(xué)電氣與自動化工程學(xué)院;
【基金】：國家自然科學(xué)基金(51367008)~~
【分類號】：TM46;TM721.1

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