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针对串联补偿系统次同步谐振的抑制及防止措施，对ＮＧＨ次同步谐振阻尼方案作了详细的理论分析和仿真研究，并在此基础上对原ＮＧＨ方案作进一步的改进，提出了带有次同步谐振检测和预触发功能的ＮＧＨ方案。通过具体算例的仿真分析说明，ＮＧＨ次同步谐振阻尼方案对提高暂态转矩稳定和有次同步谐振问题系统的稳定性是非常有效的。采用改进方案后，ＮＧＨ控制在次同步谐振发生时能自动投入，比原方案更迅速有效地抑制振荡，在次同步谐振基本抑制后又能自动平滑地退出。
Aiming at the suppression and prevention measures of subsynchronous resonance in series compensation system, the detailed theoretical analysis and simulation research on the NGH subsynchronous resonance damping scheme are made. Based on this, the original NGH scheme is further improved. Resonance detection and pre-trigger function of the NGH program. The simulation analysis of a specific example shows that the NGH subsynchronous resonance damping scheme is very effective to improve the system stability of transient torque stability and subsynchronous resonance. With the improved scheme, the NGH control can be automatically put into operation when the subsynchronous resonance occurs, and the oscillation can be suppressed more rapidly and effectively than the original scheme, and then automatically and smoothly exit after the subsynchronous resonance is basically suppressed.