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中文摘要：
为提高在线暂态稳定仿真的精度,需要提高外网动态等值精度.首先需要引入缓冲网,将靠近内网的少量外网厂站详细建模,以保留外网重要的动态响应细节;其次应保留外网中对内网动态过程影响较大的发电机的详细模型.为此,文章提出了外网动态等值中缓冲网设定策略和保留发电机策略,并给出了判定标准和公式.算例表明,采用上述策略后,内网的仿真精度可大大提高,与标准曲线十分接近;在外网非常庞大的情况下,虽然判定标准和公式所确定的保留发电机和缓冲网规模相对很小,但基本上提供了外网动态模型的重要细节,适于在线应用.
英文摘要：
To improve the precision of online transient stability simulation （TSS） it is necessary to improve the equivalent precision of external network. Firstly, buffer subsystem, i.e., a part of the external subsystem, should be led into TSS and a small amount of power plants and substations alongside internal subsystem should be modelled in detail to reserve important details of dynamic response of external subsystem; secondly, the detailed models of generators in external subsystem, which evidently influence the dynamic response of internal subsystem, should be reserved. For this reason, the authors propose strategies for external generators reservation and buffer subsystem selection during dynamic equivalence of external subsystem, and then both rules and formulae are given. Simulation results show that by use of above-mentioned rules and formulae the simulation precision of internal subsystem can be improved remarkably and simulation curves such as internal generator rotor angles, nodal voltages, power of lines, etc., are more close to standard curves; under the condition of bulky external subsystem, although the scale of reserved generators and buffer subsystem determined by the rules and formulae are relatively small, the important details of dynamic model for external subsystem can still be provided, so the proposed rules and formulae are suitable for online application.
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