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A Numerical Convex Lens for the State-Discretized Modeling and Simulation of Megawatt Power Electronics Systems as Generalized Hybrid Systems
Engineering ( IF 12.8 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.eng.2021.07.011
Bochen Shi 1 , Zhengming Zhao 1 , Yicheng Zhu 1 , Zhujun Yu 1 , Jiahe Ju 1
Affiliation  

Modeling and simulation have emerged as an indispensable approach to create numerical experiment platforms and study engineering systems. However, the increasingly complicated systems that engineers face today dramatically challenge state-of-the-art modeling and simulation approaches. Such complicated systems, which are composed of not only continuous states but also discrete events, and which contain complex dynamics across multiple timescales, are defined as generalized hybrid systems (GHSs) in this paper. As a representative GHS, megawatt power electronics (MPE) systems have been largely integrated into the modern power grid, but MPE simulation remains a bottleneck due to its unacceptable time cost and poor convergence. To address this challenge, this paper proposes the numerical convex lens approach to achieve state-discretized modeling and simulation of GHSs. This approach transforms conventional time-discretized passive simulations designed for pure-continuous systems into state-discretized selective simulations designed for GHSs. When this approach was applied to a largescale MPE-based renewable energy system, a 1000-fold increase in simulation speed was achieved, in comparison with existing software. Furthermore, the proposed approach uniquely enables the switching transient simulation of a largescale megawatt system with high accuracy, compared with experimental results, and with no convergence concerns. The numerical convex lens approach leads to the highly efficient simulation of intricate GHSs across multiple timescales, and thus significantly extends engineers’ capability to study systems with numerical experiments.



中文翻译:

用于将兆瓦电力电子系统作为广义混合系统进行状态离散化建模和仿真的数值凸透镜

建模和仿真已成为创建数值实验平台和研究工程系统不可或缺的方法。然而,工程师今天面临的日益复杂的系统极大地挑战了最先进的建模和仿真方法。这种复杂的系统不仅由连续状态组成,而且由离散事件组成,并且包含跨多个时间尺度的复杂动态,在本文中被定义为广义混合系统(GHS)。作为具有代表性的GHS,兆瓦电力电子(MPE)系统已大量集成到现代电网中,但由于其时间成本不可接受且收敛性差,MPE仿真仍然是一个瓶颈。为了应对这一挑战,本文提出了数值凸透镜的方法来实现GHS的状态离散化建模和模拟。这种方法将专为纯连续系统设计的传统时间离散无源模拟转换为为 GHS 设计的状态离散选择性模拟。当这种方法应用于基于 MPE 的大型可再生能源系统时,与现有软件相比,模拟速度提高了 1000 倍。此外,与实验结果相比,所提出的方法独特地使大规模兆瓦系统的开关瞬态模拟具有高精度,并且没有收敛问题。数值凸透镜方法可以在多个时间尺度上高效模拟复杂的 GHS,

更新日期:2021-08-26
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