【摘要】：變電站內(nèi)母線電壓互感器(TV)的二次側(cè)通常裝設(shè)有自動(dòng)投切的阻尼消諧裝置以消除投切空載母線引發(fā)的鐵磁諧振。但受限于小阻值投入利于消諧、大阻值切除利于擾動(dòng)控制的阻值選擇矛盾,此類消諧裝置可能因?yàn)橥度胱柚颠^大而無法消除諧振,或投入阻值過小而在自切除時(shí)引發(fā)二次諧振。針對上述傳統(tǒng)消諧裝置的弊端,提出了利用門極可關(guān)斷晶閘管(GTO)控制小阻值電阻脈沖投入,通過投入占空比逐步減小至零逐步實(shí)現(xiàn)阻尼自切除的消諧方案。首先,通過數(shù)值仿真擬定了可在較廣泛系統(tǒng)參數(shù)區(qū)間內(nèi)實(shí)現(xiàn)有效消諧的阻值1.5?。然后,對比不同阻尼投入占空比減小方案,設(shè)計(jì)了不引起二次諧振的占空比減小方案"微步退出策略";諧波平衡分析證明了該方案的可行性,同時(shí)亦表明母線對地電容和斷路器均壓電容過小可能導(dǎo)致占空比減小至零即阻尼設(shè)備切除后鐵磁諧振的自激。針對上述自激現(xiàn)象,進(jìn)一步提出了并聯(lián)二次電容的改善措施。仿真結(jié)果證明脈沖阻尼附加二次電容可保證諧振得到有效消除并實(shí)現(xiàn)阻尼設(shè)備的順利退出。
[Abstract]:The secondary side of bus voltage transformer (TV) in substation is usually equipped with automatic switching damping harmonic elimination device to eliminate ferromagnetic resonance caused by switching no-load bus. However, limited by the input of small resistance, it is advantageous to eliminate harmonics, and the choice of resistance value of large value is beneficial to disturbance control. This kind of harmonic cancellation device may be unable to eliminate resonance because the input resistance value is too large, or the input resistance value is too small to cause secondary resonance when self-cutting. In view of the disadvantages of the traditional harmonic elimination device mentioned above, a scheme is proposed to control the low resistance pulse input by using the gate turn-off thyristor (GTO), and to realize the harmonic elimination scheme of damping self-removal step by decreasing the duty cycle to zero step by step. First of all, through numerical simulation, the effective harmonic elimination value is drawn up in a wide range of system parameters. Then, compared with different damping input duty cycle reduction schemes, a duty cycle reduction scheme "micro-step exit strategy" is designed, which does not cause secondary resonance, and harmonic balance analysis proves the feasibility of the scheme. At the same time, it is also shown that the reduction of the duty cycle to zero is the self-excitation of the ferromagnetic resonance after the removal of the damping equipment, when the busbar capacitance and the circuit breaker voltage equalizing capacitance are too small. In view of the above self-excited phenomenon, the improvement measures of parallel secondary capacitance are put forward. The simulation results show that the pulse damping plus secondary capacitor can effectively eliminate the resonance and realize the smooth exit of the damping equipment.
【作者單位】： 重慶大學(xué)輸配電裝備及系統(tǒng)安全與新技術(shù)國家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金(51177182) 國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)(2009CB724504)~~
【分類號】：TM864

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