Integrated Framework for Power System Security Assessment Using Energy Methods

由于电力负荷的增加和电力在公用事业之间的更大传输，电力高压传输系统的负荷越来越重，由于静态安全性、暂态稳定性、还有最近的电压稳定性约束。本文的研究目的是利用能量函数方法，建立统一的电力系统安全度量标准。迄今为止，能量函数技术已成功地应用于暂态稳定和最大稳定负荷问题；然而，关于动态电压稳定性的研究很少。这种系统电压安全措施对经济可靠运行至关重要。研究将在四个领域进行。第一个领域将是充分捕捉与电压不稳定相关的动力学所需的建模细节的调查。发电机、负载、变压器和静态无功补偿器（SVCs）的更详细的模型有望实现。其次，将研究集成能量函数安全框架的开发，这将需要一个修改的能量函数，以及一个新的范式，以纳入电压动态的不同时间尺度（从秒到几十分钟）。第三，研究了电压稳定不稳定平衡点（uep）与暂态稳定平衡点的关系；同时，还将对uep的有效计算进行研究。最后，将探索将能源方法整合到现有的控制中心应用中。

As electrical power high voltage transmission systems become more heavily loaded due to increased electric loads and larger transfers of power between utilities, efficient system operation is becoming threatened due to static security, transient stability, and more recently voltage stability constraints. The objective of the research proposed here is to use energy function methods to develop a unified measure of power system security. To date energy functions techniques have been applied successfully to the transient stability and maximum stable loadability problems; however, little work has been done to access dynamic voltage stability. Such a measure of system voltage security is essential for economic and reliable operations. Research is to be performed in four areas. The first area will be an investigation of the modeling detail required to adequately capture the dynamics associated with voltage instability. More detailed models are anticipated for generators, loads, transformers and static var compensators (SVCs). Second, research will be done on the development of integrated energy function security framework, which will require a modified energy function, along with a new paradigm to incorporate the varying time scales of the voltage dynamics (from seconds to tens of minutes). Third, the relationship of the voltage stability unstable equilibrium points (UEPs) with the transient stability UEPs will be investigated; also work on the efficient calculation of the UEPs will also be done. Lastly, integration of energy methods into existing control center applications will be explored.