Accurate computation of power system transients

本课题是对电力系统暂态过程的精确计算(仿真)进行研究。研究的目标领域是利用基于电路的电力系统模型计算电磁暂态(EMT)。电磁暂态系统的仿真和分析对于高效、可靠、环保的电力系统的运行至关重要。EMT仿真工具用于确定元件额定值，如绝缘水平和能量吸收能力，在设计和优化过程中，用于测试控制和保护系统，并一般用于分析电力系统。*本项目的结果将影响EMT类型计算方法的准确性。主要研究了两个方面：*在第一个方面，建议提高初始条件的计算精度。在进行暂态分析之前，这些条件确定了电力系统的稳态运行点。尽管目前已有稳态初始化方法可用，但建议开发能够更准确地考虑谐波、控制系统和各种基于电力电子学的设备的新技术。还建议研究在存在非线性的情况下寻找多个稳态解的方法。这项研究将减少工程工作量和延误，并显著提高对复杂问题的模拟能力，如地磁扰动和风力发电集成。*在第二方面，建议开展与控制框图、通用数学工具和外部模型接口的电力网络方程的精度问题的研究。目前，这种接口通常基于经常导致错误和/或需要增加计算定时的近似。除了建模的准确性和灵活性外，本研究还将对EMT类应用之间的建模可移植性问题产生重要影响。这项研究将有助于在不同的仿真平台之间进行准确的开源和黑盒模型交换，并将促进工程工作流程。拟议的开源建模研究将导致标准化，并为研究和行业提供维护建模一致性的重要手段。*该研究计划将通过提供能够解决目前无法解决的分析问题的计算技术，对加拿大电力系统公用事业产生影响。加拿大在电力系统先进仿真工具的开发和供应方面也处于世界领先地位，这项研究将提供新的数值方法，可供相关软件开发公司有利地使用。

This project is for conducting research on the accurate computation (simulation) of power system transients. The targeted field of research is the computation of electromagnetic transients (EMT) using circuit based models of power systems. The simulation and analysis of EMTs is crucial to the operation of an efficient, reliable and environmentally friendly power system. The EMT simulation tools are used for the determination of component ratings such as insulation levels and energy absorption capabilities, in the design and optimization process, for testing control and protection systems and for analyzing power systems in general.****The findings of this project will impact on the accuracy of EMT-type computation methods. Two main aspects are investigated.*******On the first aspect it is proposed to increase the accuracy in the computation of initial conditions. Such conditions establish the steady-state operating point of a power system before performing transient analysis. Although steady-state initialization methods are currently available, it is proposed to develop new techniques capable to account more accurately for harmonics, control systems and various power electronics based devices. It is also proposed to study methods for finding more than one steady-state solution in the presence of nonlinearities. This research will allow to reduce engineering efforts and delays, and significantly improve simulation capabilities for complex problems, such as geomagnetic disturbances and integration of wind generation.*******On the second aspect, it is proposed to conduct research on accuracy problems related to interfacing of electrical network equations with control block diagrams, generic mathematical tools, and external models. Currently, such interfacing is typically based on approximations that often result into errors and/or require increased computing timings. In addition to modeling accuracy and flexibility, this research will have an important impact on modeling portability problems between EMT-type applications. This research will contribute methods that will allow accurate open-source and black-box model exchange among different simulation platforms and will facilitate engineering work flow. The proposed research on open-source modeling will lead to standardization and deliver important means for maintaining modeling consistency to research and industry.*******This research program will impact on Canadian power system utilities by delivering computational techniques capable of solving analysis problems that cannot be solved today. Canada is also a world leader in the development and supply of advanced simulation tools for power systems and this research will contribute new numerical methods that can be advantageously used by related software development companies.***