發(fā)布時(shí)間：2018-03-01 18:52

  本文關(guān)鍵詞： 高壓直流輸電 緊急負(fù)荷控制 電壓薄弱性 原對(duì)偶內(nèi)點(diǎn)法　出處：《電力系統(tǒng)自動(dòng)化》2017年17期 　論文類型：期刊論文

【摘要】：特高壓直流逆變站閉鎖后,應(yīng)在確保受端系統(tǒng)安全穩(wěn)定的前提下盡量減小緊急控制的經(jīng)濟(jì)代價(jià),同時(shí),為了使逆變器盡快恢復(fù)正常運(yùn)行,控制后的系統(tǒng)還需要提供足夠的無(wú)功支撐,為此提出了一種協(xié)調(diào)經(jīng)濟(jì)性及電壓穩(wěn)定性的受端系統(tǒng)緊急負(fù)荷控制優(yōu)化方法。首先,討論了事故發(fā)生后受端系統(tǒng)的動(dòng)態(tài)響應(yīng),提出根據(jù)電壓薄弱性指標(biāo)識(shí)別受端系統(tǒng)的若干電壓薄弱節(jié)點(diǎn),將其電壓跌落量的平方和作為電壓穩(wěn)定性指標(biāo);然后,計(jì)算控制方案對(duì)應(yīng)的負(fù)荷損失及事故罰款,將兩者之和作為經(jīng)濟(jì)指標(biāo)。為克服分段優(yōu)化問題的求解困難,首先將分段的事故罰款曲線進(jìn)行了近似光滑處理;然后,在考慮頻率、電壓及潮流等約束條件的基礎(chǔ)上,以經(jīng)濟(jì)性、電壓穩(wěn)定性指標(biāo)的加權(quán)和最小為目標(biāo),構(gòu)建緊急負(fù)荷控制優(yōu)化問題的數(shù)學(xué)模型,并應(yīng)用原對(duì)偶內(nèi)點(diǎn)法快速求解;最后,以含高壓直流輸電的IEEE 10機(jī)39節(jié)點(diǎn)系統(tǒng)為例,對(duì)算法進(jìn)行了驗(yàn)證。結(jié)果表明,協(xié)調(diào)經(jīng)濟(jì)性及電壓穩(wěn)定性的優(yōu)化控制可在不增加經(jīng)濟(jì)代價(jià)的前提下,改善控制后系統(tǒng)的電壓穩(wěn)定性,有助于逆變站恢復(fù)運(yùn)行。
[Abstract]:After the UHVDC inverter station is locked, the economic cost of emergency control should be minimized under the premise of ensuring the safety and stability of the receiving end system. At the same time, in order to restore the inverter to normal operation as soon as possible, It is necessary to provide sufficient reactive power support for the controlled system. In this paper, an optimization method for emergency load control of the receiver system is proposed, which coordinates economic efficiency and voltage stability. Firstly, the dynamic response of the receiver system after an accident is discussed. According to the voltage weakness index, some weak voltage nodes of the receiver system are identified, and the square sum of the voltage drop is taken as the voltage stability index, and then the load loss and accident penalty corresponding to the control scheme are calculated. In order to overcome the difficulty of solving the piecewise optimization problem, the piecewise accident penalty curve is treated with approximate smoothness, and then, on the basis of considering the constraint conditions such as frequency, voltage and power flow, the sum of the two is taken as the economic index. The mathematical model of the optimization problem of emergency load control is constructed with the objective of economy and the weighted and minimum voltage stability index, and the original dual interior point method is applied to solve the problem quickly. Finally, the IEEE 10 machine 39 node system with HVDC transmission is taken as an example. The results show that the optimal control of coordinated economy and voltage stability can improve the voltage stability of the control system without increasing the economic cost and help the inverter station to resume operation.
【作者單位】： 河海大學(xué)能源與電氣學(xué)院;國(guó)網(wǎng)江蘇省電力公司;
【基金】：國(guó)家電網(wǎng)公司科技項(xiàng)目(SGJS0000DKJS1501031)~~
【分類號(hào)】：TM712;TM721.1

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