CAJ | 학술논문

基于扩展等面积准则(EEAC),分析了发电机强励控制对电力系统暂态稳定性的影响机理和作用规律,并指出:强励机组、强励控制量、强励启动和退出时刻是发电机强励控制效果的主要影响因素;如果不能选择合适的机组进行强励控制或者未能在恰当的时机启动和退出强励控制,则强励控制将有可能反而不利于系统稳定.在此基础上,提出了一种基于广域测量系统的发电机强励控制方案,以克服传统强励控制方案对上述因素考虑的不足.基于实际南方电网系统的仿真结果表明当通信时延在0.3 s以内时,上述广域强励控制方案可以保持良好的控制性能,有效提升系统的暂态稳定性.
기우확전등면적준칙(EEAC),분석료발전궤강려공제대전력계통잠태은정성적영향궤리화작용규률,병지출:강려궤조、강려공제량、강려계동화퇴출시각시발전궤강려공제효과적주요영향인소;여과불능선택합괄적궤조진행강려공제혹자미능재흡당적시궤계동화퇴출강려공제,칙강려공제장유가능반이불리우계통은정.재차기출상,제출료일충기우엄역측량계통적발전궤강려공제방안,이극복전통강려공제방안대상술인소고필적불족.기우실제남방전망계통적방진결과표명당통신시연재0.3 s이내시,상술엄역강려공제방안가이보지량호적공제성능,유효제승계통적잠태은정성.
@@@@ The mechanisms and effects of the generator forced excitation control on the transient stability of power systems are analyzed based on EEAC. It is pointed out that the selection of the generators to be forced excited, the control quantity, the activating and deactivating time play important roles on the effect of the forced excitation control;it may even bring negative effects on the stability of the system, if the generators or the activating/deactivating time are not properly selected. Since the traditional generator forced excitation control schemes have difficulties in solving these aforementioned problems, a novel forced excitation control scheme based on the wide-area measurement system is proposed. The simulation result of China Southern Power Grid shows that the transient stability of the system can be improved significantly with the proposed wide-area forced excitation control when the commutation delay is less than 0.3 s.