Generic AC-DC load-flow solution method with controllable AC-DC converters

基于可控交直流变流器的通用交直流负荷流求解方法本课题研究基于逆变器的系统与传统交流电网集成的负荷流计算方法。该项目针对的配电电网包括交流微电网、交直流混合微电网和多终端VSC高压直流系统。目标是提供新的和通用的负载流解决方法，能够同时解决建立稳态条件的耦合AC-DC网络，同时考虑转换器控制和各种操作模式。非线性潮流解将基于在传统交流潮流方程中加入的变流器约束。负荷流解之后是稳态解。稳态解决方案将使用集总网络模型来确定所有相量，并允许自动计算初始条件，从而进行时域模拟。这种初始化应该通过确定准确的交流-直流系统稳态相量以及通过显着减少在基于电路的交流-直流转换器网格时域仿真中浪费的计算时间来产生影响。目标不仅是为系统操作员和规划人员提供先进的负载流分析工具，而且还为基于逆变器和大型电力系统的详细时域模拟提供强大的初始化方法。负载流时间序列解决方案允许分析可再生能源的间歇性，也将包括在这项研究中。提出的新方法将在交流和混合交直流微电网基准测试，以及多终端vcs - hvdc系统基准测试中进行测试。将展示大规模集成可再生能源（如光伏和风力涡轮机）的测试案例。将模拟非常大规模的输配电电网。这将表明，所提出的研究可以使研究现代电力系统的工程任务自动化。它将减少模拟设置和初始化时间在时域进行的模拟。它将为研究交流/直流系统以及提高此类系统的运行稳健性和效率提供强大的新手段。本文所提出的工作将对日益流行的交直流系统领域的研究产生影响。它将使参与部署此类系统的加拿大工业受益。这也将有利于加拿大工业参与模拟软件开发。

Generic AC-DC load-flow solution method with controllable AC-DC converters This project is for conducting research on load-flow computation methods capable of accounting for the integration of inverter-based systems into traditional AC power grids. The project targets distribution power grids with AC microgrids, hybrid AC/DC microgrids and multiterminal VSC HVDC systems. The objective is to deliver new and generic load-flow solution methods capable of simultaneously solving coupled AC-DC networks for establishing steady-state conditions while accounting for converter controls and various operating modes. The nonlinear load-flow solution will be based on converter constraints added into traditional AC power-flow equations. The load-flow solution will be followed by steady-state solution. The steady-state solution will use lumped network models to determine all phasors and to allow for automatic computation of initial conditions leading into time-domain simulations. Such initialization should impact by determining accurate AC-DC system steady-state phasors and by dramatically reducing computing times wasted in the circuit-based time-domain simulation of grids with AC-DC converters. The objective is not only to provide advanced load-flow analysis tools to system operators and planners, but to also deliver powerful initialization methods for detailed time-domain simulations of inverter-based and large-scale power systems. Load-flow time-series solutions allowing to analyze the intermittent nature of renewable energy sources, will be also included in this research. The proposed new methods will be tested on AC and hybrid AC/DC microgrid benchmarks, as well as on multiterminal VSC-HVDC system benchmarks. Test cases with large scale integration of renewable energy sources, such as photovoltaics and wind turbines will be demonstrated. Very large-scale transmission and distribution grids will be simulated. It will be shown that proposed research can automate engineering tasks for studying modern power systems. It will reduce simulation setup and initialization timings for simulations performed in time-domain. It will deliver powerful new means for studying AC/DC systems and for increasing the operational robustness and efficiency of such systems. The proposed work will impact on research in the field of AC/DC systems which are becoming increasingly popular in the world. It will benefit the Canadian industry involved in the deployment of such systems. It will also benefit the Canadian industry involved in simulation software development.