發(fā)布時(shí)間：2018-07-10 13:03

  本文選題：振蕩中心 + 動(dòng)態(tài)遷移��； 參考：《中國(guó)電機(jī)工程學(xué)報(bào)》2017年06期

【摘要】：研究發(fā)現(xiàn)了振蕩中心處電壓和電流瞬時(shí)頻率之和等于兩側(cè)等值電勢(shì)頻率之和的規(guī)律。提出導(dǎo)致振蕩中心遷移的3個(gè)基本因素:主導(dǎo)振蕩模式更迭、等值電勢(shì)不等和系統(tǒng)阻抗比例變化。理論證明了失步斷面線路開(kāi)斷或串補(bǔ)旁路導(dǎo)致的失步斷面等值阻抗增大,不會(huì)導(dǎo)致振蕩中心遷移出失步斷面�；�"兩華"電網(wǎng)不同失穩(wěn)模式的等值阻抗特性,分析了不同擾動(dòng)導(dǎo)致振蕩中心遷移的途徑及其敏感性。由于切機(jī)等措施引起的振蕩中心某一側(cè)等值電勢(shì)阻抗變大,將導(dǎo)致振蕩中心向該側(cè)遷移,存在遷移出初始失步斷面的風(fēng)險(xiǎn)。振蕩中心一側(cè)的機(jī)組不同調(diào)可引起等值電勢(shì)比大幅變化,導(dǎo)致振蕩中心遷移初始出失步斷面,如不快速采取控制措施,可演化為多群振蕩,出現(xiàn)主導(dǎo)失穩(wěn)模式更迭,進(jìn)而導(dǎo)致振蕩中心大范圍遷移,對(duì)系統(tǒng)影響較大,需重點(diǎn)防控。
[Abstract]:It is found that the sum of instantaneous frequency of voltage and current at the center of oscillation is equal to the sum of equivalent potential frequency of both sides. Three basic factors leading to the migration of the oscillation center are proposed: the change of dominant oscillation mode, the unequal equivalent potential and the change of impedance ratio of the system. It is proved theoretically that the equivalent impedance of out-of-step section caused by breakage of out-of-step section line or series compensation bypass will not cause the oscillation center to migrate out of the out-of-step section. Based on the equivalent impedance characteristics of different instability modes in the "two Hua" power grid, the paths and sensitivities of the oscillation center migration caused by different disturbances are analyzed. Because the equivalent potential impedance of one side of the oscillation center increases due to the cutting machine and other measures, the oscillation center will migrate to that side, and there is the risk of migration out of the initial out-of-step section. Different adjustments of units on one side of the oscillation center can cause significant changes in the equivalent EMR, leading to the initial out-of-step section of the oscillation center migration. If the control measures are not taken quickly, it can evolve into multi-group oscillations and lead to the change of instability modes. Therefore, the oscillation center is shifted in a wide range, which has a great influence on the system and needs to be prevented and controlled.
【作者單位】： 華北電力大學(xué)電氣與電子工程學(xué)院;智能電網(wǎng)保護(hù)和運(yùn)行控制國(guó)家重點(diǎn)實(shí)驗(yàn)室(南瑞集團(tuán)公司);國(guó)電南瑞科技股份有限公司;
【基金】：國(guó)家重點(diǎn)研發(fā)計(jì)劃(2016YFB0900602)~~
【分類號(hào)】：TM712
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本文編號(hào)：2113475