Multidisciplinary Energy Unified Modeling and Analysis of Electric-Mechanic-Heat System for Power Electronics and Electric Machine Systems
Jia Shengyu, Shi Bochen, Zhao Zhengming, Yuan Liqiang, Liu Zhuang, Pei Jiayao
State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China
Abstract：Power electronics and electric machine systems are vital to modern power engineering and automation technologies. By integrating power electronics devices with electric machines, their speed controllability and accuracy are greatly enhanced, broadening application fields like wind power, high-speed rail, electric vehicles, and other domains. Although traditional methods for analyzing and designing electric machines are already well established, the large-scale incorporation of power electronics components in these systems has significantly increased their complexity. It introduces continuous-discrete hybrid system characteristics, multi-timescale dynamics, and tighter multidisciplinary interactions. As a result, both industry and academia face challenges in the holistic design and inter disciplinary optimization of power electronics and electric machine systems. An efficient and accurate numerical simulation method and platform are indispensable to investigating the complex, intertwined behaviors across different domains within these systems. In multidisciplinary modeling of power electronics and electric machine systems, the principal difficulty lies in unifying models for electrical, mechanical, thermal, and other domains while accommodating the continuous-discrete hybrid characteristics introduced by the widespread use of power electronics. This work addresses the multidisciplinary modeling of power electronic and electric machine systems by building mechanical, thermal, and other domain-specific physical models upon a circuit-based state-space modeling approach and a discrete-state-event-driven (DSED) simulation framework. Toward this goal, two key issues need to be resolved. In the context of state-space-based circuit models, the first is to develop physical-level models for other domains so that all domains share a unified representation. The second is to design the interfaces among different domains to enable effective interconnection. This work adopts the energy-unifying concept. First, leveraging energy consistency, state variables in various domains are classified into across and through variables. With the two variables, the constitutive equations, power, and energy representation of multidisciplinary components can be expressed in a uniform form. Moreover, Kirchhoff's laws can be generalized for mechanical and thermal systems with a topology expression. Consequently, topologies and models from other domains can be presented as equivalent circuit topologies and models, thus realizing multidisciplinary modeling within a circuit-based framework. The connection interfaces between domains based on through and across variables and energy conservation are designed as a pair of across and through sources. The interface characterizes the energy conversion processes across domains while following energy conservation laws. Focusing on power electronics and electric machine systems, this work analyzes the frequently used components from the energy transmission and conversion perspective and provides concrete interface representations. Finally, the paper demonstrates the proposed multidisciplinary modeling approach and interface design using a specific wind power generation system as an example.
贾圣钰, 施博辰, 赵争鸣, 袁立强, 刘壮, 裴家耀. 电力电子与电机系统的“电-机-热”多学科能量统一建模及分析[J]. 电工技术学报, 2025, 40(20): 6577-6590.
Jia Shengyu, Shi Bochen, Zhao Zhengming, Yuan Liqiang, Liu Zhuang, Pei Jiayao. Multidisciplinary Energy Unified Modeling and Analysis of Electric-Mechanic-Heat System for Power Electronics and Electric Machine Systems. Transactions of China Electrotechnical Society, 2025, 40(20): 6577-6590.
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