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基于阻尼特性分析对抑制次同步振荡的附加励磁系统阻尼控制器(SEDC)进行了详细研究。首先基于IEEE次同步谐振第一标准测试系统及IEEEST1A型励磁系统设计相应的SEDC。采用测试信号法,通过计算发电机组的次同步电气阻尼特性,分析所设计的SEDC对发电机组次同步振荡的抑制效果。结果表明,SEDC在不采用带通滤波器的方式下,将转速偏差经适当移相及放大,通过对励磁电压的调节,可以提供足够的阻尼转矩抑制次同步谐振;采用带通滤波器可大大提高通带频率对应的电气阻尼,同时对多个模态采用带通滤波,可以同时提高各个扭振频率处的电气阻尼,有利于次同步谐振的抑制。
Based on the damping characteristics analysis, the additional excitation system damping controller (SEDC) that suppresses subsynchronous oscillation is studied in detail. First, based on the IEEE subsynchronous resonance first standard test system and IEEEST1A excitation system design corresponding SEDC. By using the test signal method, the subsynchronous electrical damping characteristics of the generator set are calculated, and the suppression effect of the designed SEDC on the sub-synchronous oscillation of the generator set is analyzed. The results show that the SEDC can not provide the band-pass filter, and the speed deviation can be appropriately phase-shifted and amplified. By adjusting the excitation voltage, SEDC can provide sufficient damping torque to suppress subsynchronous resonance. The band-pass filter Which greatly improves the electrical damping corresponding to the passband frequency and uses band-pass filtering for multiple modes at the same time, which can simultaneously improve the electrical damping at each torsional vibration frequency and is favorable for the suppression of subsynchronous resonance.