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，并将开发的工具整合到电力领域课程中。在项目的第一阶段，为分段光滑系统开发了数值技术和仿真工具。分段平滑（PWS）系统建模是一种通用的方法，包括各种建模选项：从理想的分段线性（PWL）模型，适用于许多开关周期的快速瞬态仿真，到详细的非线性模型，用于准确预测开关周期内的波形。因此，开发的PWS模拟器能够执行完整范围的仿真任务，并有助于分析和设计广泛的电力电子应用，包括电力系统和公用事业接口，电机驱动器，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：统一表示PWL， PWS和光滑非线性元素以获得恒定的系统矩阵，使用数值连续方法对非线性进行有效迭代，以及PWS状态确定算法以消除快速切换转换的收敛问题。该项目的第二阶段侧重于PWS的应用和扩展。模拟器：(1)全面的开关电源变换器的计算机辅助稳态分析，包括寻找周期稳态解的通用、高效和鲁棒算法，在一系列参数上跟踪稳态特性，在参数空间中跟踪工作模式边界；(2)电力电子系统小信号和大信号自动化动态建模；(3)高级CAD工具的框架，如合成、公差分析和设计优化工具。所开发的技术在软件中实现，适用于电力电子和电力系统的研究、开发和教育。这些工具被整合到两门本科电力领域的课程中——一门能量转换讲座课程和一门新的、动手操作的电力电子实验室。开发了一套交互式网页，将在线模拟工具与配套的实验室和课程材料结合起来。

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.