随着柔性交流输电(FACTS)技术理论和工程应用的逐渐深化与推广,FACTS装置大幅度提高线路的功率传输水平、提高电力系统稳定性的能力逐渐得到体现。然而,随着FACTS装置应用数量的不断增多,FACTS装置间的交互影响问题日益突出, 规范形方法为研究电力系统嵌入多FACTS装置的动态特性提供了一种解决方案。然而如何确定系统危险运行方式及该方式下对FACTS装置间交互影响的程度,成为研究FACTS装置间交互影响问题中的关键环节之一。由于系统运行状态空间庞大,搜索不同运行状态下的FACTS装置间交互影响信息成为限制计算速度和计算效率的关键因素。本文针对高阶规范形方法计算FACTS装置间交互影响时危险运行方式确定的问题,提出一种改进的交互影响衡量指标,该指标能够将FACTS装置间的交互影响程度分析与危险运行方式确定同时计及,且在计算过程中引入了电磁暂态仿真手段,以辅助验证所提方法的效果。以静止无功补偿器(SVC)和可控串联补偿器(TCSC)为例,应用IEEE 9节点系统进行算例分析,验证了该方法的可行性。
According to the theory and the applications of the Flexible AC Transmission System (FACTS) technology, the FACTS devices can improve the level of the power transmission and the power system stability. With the growing applications of FACTS devices, the interaction between the FACTS devices becomes increasingly an important issue. The normal form method provides a solution of the dynamic analysis of the power system embedded with the multiple FACTS devices. How to determine the critical operation mode of the power system, and the degree of the interaction of multiple FACTS devices in the critical operation mode become a key problem. The operating state of a power system has many modes. The interaction of the FACTS devices in different operating states is a key factor in increasing the computation speed and the computation efficiency. This paper, based on the high order normal form method, proposes an improved interaction index to analyze the degree of interaction between the FACTS devices. The improved interaction index also considers the determination of the critical operation mode of the power system. The electromagnetic transient simulation is used for the verification of the proposed method. Finally, taking the Static Var Compensator (SVC) and the Thyristor Controlled Series Compensation (TCSC) on the IEEE 9-bus power system as examples, the feasibility of the proposed improved interaction index is shown.