GTO控制阻尼电阻脉冲投入的铁磁谐振控制

发布时间：2018-10-11 13:10

【摘要】：变电站内母线电压互感器(TV)的二次侧通常装设有自动投切的阻尼消谐装置以消除投切空载母线引发的铁磁谐振。但受限于小阻值投入利于消谐、大阻值切除利于扰动控制的阻值选择矛盾,此类消谐装置可能因为投入阻值过大而无法消除谐振,或投入阻值过小而在自切除时引发二次谐振。针对上述传统消谐装置的弊端,提出了利用门极可关断晶闸管(GTO)控制小阻值电阻脉冲投入,通过投入占空比逐步减小至零逐步实现阻尼自切除的消谐方案。首先,通过数值仿真拟定了可在较广泛系统参数区间内实现有效消谐的阻值1.5?。然后,对比不同阻尼投入占空比减小方案,设计了不引起二次谐振的占空比减小方案"微步退出策略";谐波平衡分析证明了该方案的可行性,同时亦表明母线对地电容和断路器均压电容过小可能导致占空比减小至零即阻尼设备切除后铁磁谐振的自激。针对上述自激现象,进一步提出了并联二次电容的改善措施。仿真结果证明脉冲阻尼附加二次电容可保证谐振得到有效消除并实现阻尼设备的顺利退出。
[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.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家自然科学基金(51177182) 国家重点基础研究发展计划(973计划)(2009CB724504)~~
【分类号】：TM864

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