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

具有可控AC-DC变流器的通用交直流潮流求解方法 该项目是为了进行潮流计算方法的研究，该方法能够考虑逆变器系统与传统交流电网的集成。该项目的目标是采用交流微电网、交直流混合微电网和多端VSC高压直流系统的配电网。 其目的是提供新的和通用的潮流求解方法，能够同时求解AC-DC耦合网络，以建立稳态条件，同时考虑变流器控制和各种运行模式。非线性潮流的求解将基于传统交流潮流方程中加入的变流器约束条件。潮流解之后是稳态解。稳态解决方案将使用集中网络模型来确定所有相量，并允许自动计算导致时间域模拟的初始条件。这样的初始化应该通过确定准确的AC-DC系统稳态相量以及通过显著减少基于电路的具有AC-DC转换器的电网的时域仿真所浪费的计算时间来产生影响。 其目标不仅是为系统操作员和规划者提供先进的潮流分析工具，而且还为基于逆变器的大规模电力系统的详细时域仿真提供强大的初始化方法。潮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。 建议的新方法将在交流和交直流混合微电网基准以及多端VSC-HVDC系统基准上进行测试。将演示大规模集成可再生能源的测试案例，如光伏和风力涡轮机。将模拟超大规模的输电网和配电网。这将表明，所提出的研究可以使现代电力系统研究的工程任务自动化。它将减少在时间域中执行的模拟的模拟设置和初始化时间。它将为研究AC/DC系统和提高此类系统的运行健壮性和效率提供强大的新手段。 这项拟议的工作将对交直流系统领域的研究产生影响，该领域在世界上正变得越来越流行。这将使参与部署这类系统的加拿大行业受益。这也将使参与仿真软件开发的加拿大行业受益。

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.