CAREER: Computer Aided Analysis and Design of Power Electronic Systems

该项目的目标是开发用于电力电子系统的计算机辅助分析、建模、综合和设计的数值技术，并将所开发的工具集成到电力领域的课程中。在项目的第一阶段，开发了分段光滑系统的数值技术和仿真工具。分段平滑(PWS)系统建模是一种通用的建模方法，它包括各种建模选项：从适用于多个开关周期的快速暂态仿真的理想化分段线性(PWL)模型，到用于准确预测开关周期内的波形的详细的非线性模型。因此，开发的PWS仿真器能够执行完整的仿真任务，并帮助分析和设计广泛的电力电子应用，包括电力系统和公用设施接口、电机驱动、可再生能源系统和开关电源。PWS模拟器基于新的数值技术，包括：PWL、PWS和光滑非线性元件的统一表示以获得恒定的系统矩阵，使用数值连续方法对非线性进行高效迭代，以及消除快速开关转换周围的收敛问题的PWS状态确定算法。该项目的第二阶段集中于PWS模拟器的应用和扩展：(1)全面的计算机辅助开关功率转换器的稳态分析，包括通用、高效和健壮的算法，用于寻找周期性稳态解，跟踪一系列参数的稳态特性，以及跟踪参数空间中的工作模式边界；(2)电力电子系统的自动化小信号和大信号动态建模；(3)高级CAD工具的框架，如综合、容差分析和设计优化工具。所开发的技术在适用于电力电子和电力系统研究、开发和教育的软件中实现。这些工具被整合到两门本科生的电力领域课程中--一门能源转换讲座课程和一个新的、动手的电力电子实验室。开发了一套交互式网页，将在线模拟工具与辅助实验室和课程材料相结合。

ECS-9703449 Maksimovic The objective of this project is to develop numerical techniques for computer aided analysis, modeling, syntheses and design of power electronic systems, and to integrate the developed tools in the power-area curriculum. In the first phase of the project, numerical techniques and a simulation tool are developed for piecewise-smooth systems. Piecewise-smooth (PWS) system modeling is proposed as the general approach that includes full range of modeling options: from idealized piecewise-linear (PWL) models suitable for fast transient simulation over many switching cycles, to detailed nonlinear models for accurate predictions of waveforms within a switching cycle. As a result, the developed PWS simulator is able to perform a complete range of simulation tasks and to aid analysis and design of a wide range of power electronic applications including power system and utility interfaces, motor drives, renewable energy systems and switching power supplies. The PWS simulator is based on new numerical techniques including: unified representation of PWL, PWS and smooth nonlinear elements to obtain a constant system matrix, efficient iteration over nonlinearity using numerical continuation methods, and a PWS state determination algorithm to eliminate convergence problems around fast switching transitions. The second phase of the project concentrates on applications and extensions of the PWS .simulator: (1) comprehensive computer-aided steady-state analysis of switching power converters, including general, efficient and robust algorithms for finding periodic steady-state solution, tracing steady-state characteristics over a range of parameters, and tracing operating-mode boundaries in the parameter space; (2) automated small-signal and large-signal dynamic modeling of power electronic systems; (3) a framework for higher-level CAD tools such as synthesis, tolerance analysis and design optimization tools. The developed techniques are implemented in software suitable for use in power electronics and power systems research, development and education. The tools are integrated into two undergraduate power-area courses - an Energy Conversion lecture course and a new, hands-on Power Electronics laboratory. A set of interactive WEB pages is developed to combine on-line simulation tools with supporting laboratory and course materials.